Login Timestamp Error or Bad Timestamp Error (40105) on a Company Laptop 

One of our users reported that their company laptop displayed a Login Timestamp Error (also known as Bad Timestamp Error 40105) while attempting to sign in.

In most enterprise environments, this error occurs because the laptop's date and time are not synchronized with the organization's authentication server.


This commonly happens when:

• The laptop has been disconnected from the company network for several days.
• The device has not connected to the corporate VPN.
• The BIOS date and time are incorrect.
• Windows Time service is not running.

Fortunately, this issue can usually be resolved within a few minutes.

Table of Contents

1. What is Login Timestamp Error (40105)?
2. Why Does This Error Occur?
3. Solution 1: Restart Windows Time Service
4. Solution 2: Correct Date & Time from BIOS
5. How Windows Time Synchronization Works
6. Additional Troubleshooting
7. Frequently Asked Questions
8. Conclusion

What is Login Timestamp Error (40105)?

The Login Timestamp Error (40105) is an authentication error that occurs when the system time on your laptop differs significantly from the company's authentication server. Error 40105

Most organizations use technologies such as Active Directory, Kerberos Authentication, or Single Sign-On (SSO), which rely on accurate timestamps to validate login requests.

If the time difference exceeds the allowed limit, authentication fails.

Why Does This Error Occur?

The company's authentication server verifies your computer's system time before allowing access.

If your laptop clock is incorrect, Windows sends an invalid timestamp during authentication, causing the login request to fail. Windows Time Service


Common causes include:

• Incorrect BIOS date and time
• Windows Time service stopped
• Laptop disconnected from VPN for a long period
• CMOS battery issue
• Failed time synchronization with the domain controller

Quick Fix 1: Restart Windows Time Service

If you're able to sign in to Windows, restart the Windows Time service.

Steps

• Press Win + R
• Type services.msc
• Press Enter
• Locate Windows Time
• Right-click it
• Select Restart

If the service is stopped, click Start.
This forces Windows to begin time synchronization again.
Tip: You can also restart the service from Command Prompt (Run as Administrator):

• net stop w32time
• net start w32time

Quick Fix 2: Correct the Date and Time from BIOS (UEFI)

If Windows displays an incorrect time before connecting to the network, verify the BIOS clock. Login Timestamp Error 40105

Steps

Restart the laptop.
Enter BIOS/UEFI (usually F2, F10, F12, Delete, or Esc).
Navigate to Date & Time.
Update the correct date and time.
Press F10 to save.
Restart Windows.

Note: BIOS only stores the hardware clock. It does not synchronize with internet time servers.

How Windows Time Synchronization Works

After Windows starts and the device has network connectivity, it synchronizes the system clock using Network Time Protocol (NTP). Bad Timestamp Error

Key Information:

If the device cannot communicate with the domain controller or NTP server, the system time may become inaccurate.Login Timestamp Error Domain Login Error

Additional Troubleshooting

If the issue still exists, try the following:

• ✅ Connect the laptop to the company VPN.
• ✅ Restart the computer.
• ✅ Ensure Windows Time service is running.
• ✅ Verify the correct Time Zone.
• ✅ Check if the CMOS battery is weak (time resets after every shutdown).
• ✅ Run Windows Update.
• ✅ Contact your IT administrator if the device belongs to a corporate domain.

Frequently Asked Questions (FAQ)

What causes Login Timestamp Error (40105)?
The most common cause is an incorrect system date and time.

Can a VPN connection fix this issue?
Yes. Once connected to the corporate VPN, Windows may synchronize the system time with the company's domain controller.

Does changing BIOS time permanently fix the issue?
It fixes the hardware clock, but Windows still synchronizes time using the Windows Time service after startup.

Which protocol is used for Windows time synchronization?
Windows uses Network Time Protocol (NTP) over UDP Port 123.

Can a dead CMOS battery cause this error?
Yes. If the CMOS battery is weak, the BIOS clock may reset after every shutdown, causing repeated timestamp errors.

Conclusion

The Login Timestamp Error (40105) is usually caused by an incorrect system clock rather than a problem with your user account.

In most cases, restarting the Windows Time service or correcting the BIOS date and time resolves the issue. Once the laptop synchronizes with the company's authentication server, users should be able to sign in successfully.

If the problem continues, connect the laptop to the corporate VPN or contact your organization's IT support team for further assistance.

Related Articles

• How to Fix "A Trust Relationship Between This Workstation and the Primary Domain Failed"
• Common RDP Connection Issues and Their Solutions
• Windows Time Service Not Running – Complete Fix Guide
• Active Directory Authentication Troubleshooting
• How to Join a Windows Computer to a Domain
• How to Fix Windows Time Synchronization Failed

Login Timestamp Error or Bad Timestamp Error on a Company Laptop

One user's company laptop was showing a Login Timestamp Error or Bad Timestamp Error (40105) while trying to log in.
This type of error usually occurs because your computer's date and time are out of sync with the company's security server.
It commonly happens when the laptop has been disconnected from the company network or VPN for a long time.

Why Does This Error Occur?

The company's authentication servers verify your system time before allowing access.

If your laptop's clock is incorrect, the authentication request may fail and display a Bad Timestamp or Timestamp Error (40105).

Quick Fix 1: Restart the Windows Time Service

If you're able to log in to Windows, follow these steps:

• Press Win + R, type services.msc, and press Enter.
• Locate Windows Time.
• Right-click it and select Start or Restart.

This will restart the Windows Time service and may synchronize the system clock.

Quick Fix 2: Correct the Date and Time from BIOS (UEFI)

If Windows time is incorrect and you cannot sync it, you can manually update the date and time from the BIOS.

Steps:

• Restart your computer and enter the BIOS/UEFI by pressing the manufacturer-specific key (usually F2, F10, F12, Esc, or Del).
• Navigate to the Main, System Configuration, or Miscellaneous Settings section.
• Locate Date & Time.
• Update the correct date and time.
• Press F10 to save the changes and restart the laptop.

Note: Most BIOS/UEFI firmware allows you to set the date and time manually, but it does not automatically synchronize with internet time servers.

How Time Synchronization Actually Works

The actual time synchronization happens inside the Windows operating system, not in the BIOS.

After Windows starts and the device has network connectivity, it synchronizes the system clock using Network Time Protocol (NTP).

NTP uses UDP Port 123 for both client requests and server responses, making it the standard protocol for time synchronization across networks.

Conclusion

A Login Timestamp Error or Bad Timestamp Error (40105) is usually caused by an incorrect system clock rather than an account issue.

In most cases, restarting the Windows Time service or correcting the BIOS date and time resolves the problem. Once the system time matches the company's authentication server, the user should be able to log in successfully.

Related Articles

• How to Fix "A Trust Relationship Between This Workstation and the Primary Domain Failed"
• Common RDP Connection Issues and Their Solutions
• Windows Time Service Not Running – Fix Guide
• Active Directory Authentication Troubleshooting

How to Fix Copy-Paste Not Working in Remote Desktop (RDP)

  
One user reported that while using Remote Desktop (RDP), they were unable to copy files or text from their local desktop to the remote desktop.

After investigating the issue, I identified that the most likely cause was clipboard redirection being disabled or the RDP clipboard process not responding.

Method 1: Restart the RDP Clipboard Process

The first troubleshooting step was to restart the rdpclip.exe process.

Steps:

Open Task Manager.
Locate rdpclip.exe (or RDP Clipboard Monitor).
Right-click the process and select End Task.
Press Win + R.
Type:
rdpclip.exe
Press Enter to restart the clipboard process.

Method 2: Verify Clipboard Redirection Is Enabled

Next, I verified that clipboard sharing was enabled in the Remote Desktop settings.

Steps:

• Open Remote Desktop Connection.
• Click Show Options.
• Go to the Local Resources tab.
• Under Local devices and resources, ensure that Clipboard is checked.
• Reconnect to the remote session.

Solution Provided

The copy-paste issue in the Remote Desktop session was resolved by:

Restarting the rdpclip.exe process.

Verifying that Clipboard Redirection was enabled in the Remote Desktop Connection settings.
After applying these steps, the user confirmed that copy and paste functionality was working normally again.

Conclusion

If copy-paste suddenly stops working in a Remote Desktop session, the issue is often caused by a stuck rdpclip.exe process or disabled clipboard redirection. Restarting the clipboard process and verifying the Remote Desktop settings usually resolves the problem within a few minutes.

Related Articles

• How to Fix "A Trust Relationship Between This Workstation and the Primary Domain Failed"
• Login Timestamp Error on Company Laptop – Quick Fix
• Common Remote Desktop (RDP) Connection Issues and Solutions
• How to Enable Clipboard Redirection in Remote Desktop

How to Fix "A Trust Relationship Between This Workstation and the Primary Domain Failed" in Windows (Complete Guide)

Learn how to fix "A Trust Relationship Between This Workstation and the Primary Domain Failed" using PowerShell, Active Directory, and domain rejoin methods.

This issue prevents domain users from logging into their computers even though their passwords are correct.

The good news is that the problem is usually not related to the user's password. Instead, it happens because the computer itself can no longer authenticate with the domain controller. 

In this guide, you'll learn:

• What this error means
• Why it happens
• What a secure channel is
• How computer passwords work in Active Directory
• Multiple ways to fix the problem
• Best practices to prevent it in the future

What Does This Error Mean?

That computer account behaves much like a user account.

Instead of logging in with a username and password, the computer authenticates itself using a secret machine password, also called the computer account password.

When Windows starts, the workstation silently proves its identity to the Domain Controller using this password.

If both passwords match, authentication succeeds.

If they don't match, Windows displays:

A Trust Relationship Between This Workstation and the Primary Domain Failed

Understanding the Computer's Local Secure Channel Password

Many people confuse this with the user's Windows password.

They are completely different.

Think of it like this:

Your user password identifies you.
The computer password identifies the PC.

The error occurs because the computer's identity cannot be verified anymore.

What Is a Secure Channel?

A Secure Channel is an encrypted communication path between a domain-joined computer and the Domain Controller.

This secure channel allows Windows to perform tasks such as:

• User authentication
• Kerberos ticket requests
• Group Policy processing
• Password changes
• Active Directory communication

The secure channel depends on the machine account password.

If that password becomes invalid, the secure channel breaks.

How Windows Automatically Changes the Computer Password

One interesting fact many administrators don't know is that Windows automatically changes the computer account password.

By default:

• Password changes every 30 days
• Managed by the Netlogon service
• The process happens automatically
• Users never notice it

The process is simple:

1. Windows generates a new random machine password.
2. The password is stored locally.
3. The workstation contacts the Domain Controller.
4. Active Directory updates the computer account password.
5. Secure communication continues normally.

No administrator intervention is required.

Why Does the Trust Relationship Fail?

There are several common reasons.

1. Computer Stayed Offline Too Long

This is the most common cause.

Example:

A company laptop is stored for several months.

During this period:

• Active Directory expects newer machine passwords.
• The laptop still has the old password.
• Authentication fails.

Result:

Trust relationship failed.

Why Does the Trust Relationship Fail?

There are several common reasons.

1. Computer Stayed Offline Too Long

 
This is the most common cause.

Example:

A company laptop is stored for several months.

During this period:

• Active Directory expects newer machine passwords.
• The laptop still has the old password.
• Authentication fails.

Result:

Trust relationship failed.

4. Active Directory Restore

Restoring a Domain Controller from an older backup may restore an outdated computer password.

The workstation has the newer password.

Again, the passwords no longer match.

5. Virtual Machine Snapshot Rollback

This is common in virtual environments.

If a VM is reverted to an old snapshot, it also restores an old machine password.
The Domain Controller still expects the newer one.

Symptoms

You may notice:

• Trust relationship error during login
• Unable to log in using domain credentials
• Local Administrator login still works
• Group Policy not updating
• Authentication failures
• Domain resources inaccessible
• How to Verify the Problem

Login using a local administrator account.

Open PowerShell as Administrator and Run.

• Test-ComputerSecureChannel

Example output:

• False

This indicates the secure channel is broken.


 

Method 1 – Repair Using PowerShell (Recommended)

This is the fastest solution.

Open PowerShell as Administrator.


Run:

• Test-ComputerSecureChannel -Repair -Credential DOMAIN\DomainAdminUser -Verbose

Example:

• Test-ComputerSecureChannel -Repair -Credential CONTOSO\AdminUser -Verbose

If successful, PowerShell returns:

• True

Restart the computer.

The trust relationship should now be restored.

Method 2 – Reset the Computer Account

On the Domain Controller:

• Open Active Directory Users and Computers (ADUC).
• Locate the computer object.
• Right-click the computer.
• Select Reset Account.
• Confirm the action.

Now return to the workstation.

Repair the secure channel or rejoin the domain.

Method 3 – Remove and Rejoin the Domain

If PowerShell repair doesn't work:

Open:
System Properties


Go to:
Computer Name


Click:
Change


Choose:
Workgroup

Restart the computer.


Then:
Join the domain again.
Restart once more.


This creates a new secure relationship with Active Directory.

Method 4 – Using Netdom

If RSAT tools are installed:

• netdom resetpwd /server:DomainController /userd:Domain\AdminUser /passwordd:*

Restart afterward.

How the Authentication Process Works

Best Practices to Prevent This Error

Keep laptops online regularly
Long periods without connecting to the domain can increase the chance of machine password synchronization issues.


Avoid deleting computer accounts
Delete computer accounts only when the device has been permanently decommissioned.


Don't restore old VM snapshots
Rolling back a virtual machine may also roll back its machine password.


Verify before resetting
Before resetting a computer account, confirm that the issue is actually related to the secure channel.


Use PowerShell First
Instead of immediately removing and rejoining the domain, try repairing the secure channel. It is faster and preserves the existing computer account relationship.

Frequently Asked Questions (FAQ)

Does this error mean the user's password is wrong?
No.

The user's password is usually correct. The issue is with the computer's secure channel password.


Does Windows automatically change the computer password?
Yes.

By default, Windows changes the machine account password every 30 days using the Netlogon service.

Conclusion

The "A Trust Relationship Between This Workstation and the Primary Domain Failed" error is a common issue in Active Directory environments, but it is straightforward to resolve once you understand how machine account passwords and secure channels work.

For most situations, repairing the secure channel with PowerShell is the quickest and least disruptive solution. If that doesn't work, resetting the computer account or rejoining the domain will restore communication with the Domain Controller.

Whether you're an IT Support Engineer, System Administrator, or preparing for technical interviews, mastering this troubleshooting scenario is an essential skill that you'll likely encounter in enterprise Windows environments.

User Input Yes/No Prompt in Batch Scripting

Many Batch Scripts require user confirmation before performing an action. For example, a script may ask whether you want to continue, delete a file, or restart a system.

In such cases, we can use a **Yes/No Prompt** to collect user input and execute different actions based on the response.
In this tutorial, we'll learn how to create a simple Yes/No prompt in Batch Scripting.

Example Script

  
  
@echo off

:start
cls
set /p user_input=Do you want to continue? (yes/no)?:
if not defined user_input goto start
::echo %user_input%
if /i %user_input%==y goto Yes
if /i %user_input%==n (goto No) else (goto InvalidInput)

:: /i for upercase, lowercase, or mixed case letters. It makes the comparison case-insensitive.

:Yes
echo user has entered yes
pause
goto start

:No
echo user has entered no
pause
goto start

:invalidInput
echo %user_input% is an Invalid input. Please enter 'y' or 'n'.` 
set user_input=
pause
goto start
  

How the Script Works

#Step 1: Ask for User Input

set /p user_input=Do you want to continue? (yes/no)?:


The user's response is stored in the variable:
user_input

Example:

y
OR
n




#Step 2: Check for Empty Input

if not defined user_input goto start

If the user presses Enter without typing anything, the script returns to the beginning and asks again.



#Step 3: Handle "Yes"

if /i %user_input%==y goto Yes

If the user enters:
y


The script jumps to:
:Yes



Output:

user has entered yes




#Step 4: Handle "No"

if /i %user_input%==n (goto No)
If the user enters:
n


The script jumps to:
:No


Output:
user has entered no



#Step 5: Handle Invalid Input

If the user enters something else:

abc


The script jumps to:
:InvalidInput

Output:

abc is an Invalid input. Please enter 'y' or 'n'.
The variable is cleared and the user is asked again.

What Does /I Mean?

The `/i` option makes comparisons case-insensitive.

Example:

The following inputs will all be treated as valid:
y
Y

Without `/i`, Batch would treat uppercase and lowercase letters differently.

Sample Output

#User Enters Yes

Do you want to continue? (yes/no)? y
user has entered yes


#User Enters No

Do you want to continue? (yes/no)? n
user has entered no


#User Enters Invalid Value
Do you want to continue? (yes/no)? hello

hello is an Invalid input. Please enter 'y' or 'n'.

Real-World Uses

System Engineers often use Yes/No prompts for:

• * Confirming software installations
• * Starting backups
• * Restarting services
• * Deleting files or folders
• * Running maintenance tasks
• * Executing administrative scripts

This helps prevent accidental actions.

Interview Questions

#What does `set /p` do?
It takes input from the user and stores it in a variable.


#What does `if not defined` do?
It checks whether a variable is empty.


#What does `/i` mean in an IF statement?
It makes the comparison case-insensitive.


#Why is input validation important?
It prevents users from entering invalid values and improves script reliability.


#What is the purpose of `goto`?
It transfers execution to a specified label.

Conclusion

A Yes/No prompt is a simple but useful feature in Batch Scripting. It allows scripts to interact with users, validate input, and perform different actions based on the response. By combining `set /p`, `if`, and `goto`, you can build more interactive and user-friendly automation scripts.

 ERRORLEVEL in Batch Scripting with Example

When running commands in Batch Scripting, it is important to know whether a command was executed successfully or failed.

This is where the **ERRORLEVEL** variable becomes useful.

`ERRORLEVEL` helps us check the result of the previously executed command and take action based on success or failure.



In this tutorial, we will learn how to use ERRORLEVEL with a practical example.

 What is ERRORLEVEL?


`ERRORLEVEL` is a special system variable in Batch Scripting.


After a command executes:

* `0` usually means **Success**
* Any non-zero value usually means **Error or Failure**

Example

text
ERRORLEVEL = 0


Means the command completed successfully.

• ERRORLEVEL = 1

Means an error occurred.

Example: Checking a Folder Path

  @echo off

set /P FolderPath=Enter the folder path:

 cd %FolderPath%

if %ERRORLEVEL% EQU 0 (
      echo You entered the Correct path: %FolderPath% and it will exists
) else (
        echo You entered the Wrong path: %FolderPath%
)


  

How the Script Works

Step 1

The script asks the user to enter a folder path.

set /P FolderPath=Enter the folder path:


Example:

C:\Users\user\Desktop


Step 2

The script attempts to change to the specified directory.


cd %FolderPath%

If the folder exists:

ERRORLEVEL = 0

If the folder does not exist:

ERRORLEVEL = 1


(or another non-zero value)


Step 3

The IF statement checks ERRORLEVEL.

if %ERRORLEVEL% EQU 0

If successful:

• You entered the Correct path

Otherwise:

• You entered the Wrong path

Example Output (Valid Path)

• C:\Users\user\Desktop

Output

You entered the Correct path: C:\Users\user\Desktop and it will exists




Example Output (Invalid Path)


Input
C:\InvalidFolder

Output
You entered the Wrong path: C:\InvalidFolder

Why is ERRORLEVEL Important?

ERRORLEVEL helps us:

• * Detect command failures
• * Validate user input
• * Handle errors automatically
• * Improve script reliability
• * Create professional automation scripts

Without ERRORLEVEL, a script may continue running even when something goes wrong.

Real-World Uses for System Engineers

System Engineers often use ERRORLEVEL for:

• * Checking backup success
• * Verifying software installation
• * Network troubleshooting
• * Validating file paths
• * Monitoring scheduled tasks
• * Automating maintenance scripts

It is one of the most commonly used error-checking techniques in Batch Scripting.

Interview Questions

What is ERRORLEVEL in Batch Scripting?
ERRORLEVEL is a system variable that stores the result of the last executed command.


What does ERRORLEVEL 0 mean?
It usually indicates that the command executed successfully.


What does a non-zero ERRORLEVEL mean?
It usually indicates an error or failure.


Why is ERRORLEVEL used?
It helps scripts detect and handle errors automatically.


Can ERRORLEVEL be used with IF statements?
Yes. It is commonly used with IF statements to check command results.

Conclusion

ERRORLEVEL is an essential feature in Batch Scripting that allows you to determine whether a command succeeded or failed. By combining ERRORLEVEL with IF ELSE statements, you can create smarter and more reliable scripts that handle errors effectively.

As a future System Engineer or SecDevOps professional, understanding ERRORLEVEL will help you build automation scripts that are easier to troubleshoot and maintain.

FOR Loop in Batch Scripting with Examples

When working with Batch Scripts, you may need to repeat the same task multiple times. Instead of writing the same command again and again, you can use a **FOR Loop**.

The FOR Loop helps automate repetitive tasks such as displaying values, creating folders, processing files, and running commands multiple times.

In this tutorial, we'll learn the basics of the FOR Loop using simple examples.

What is a FOR Loop?

A FOR Loop executes a block of code repeatedly for each item in a list.

Syntax


for %%variable in (list) do (
    command
)


Where:
 

• `%%variable` stores the current value.
• `list` contains the items to process.
• `do` specifies the command to execute.

Example 1: Display Numbers Using FOR Loop

@echo off
setlocal
for %%i in (1 2 3 4 5) do (
    echo %%i
)


Output

1
2
3
4
5

Explanation

In this example:

• `%%i` acts as the loop variable.
• The loop processes each value one by one.
• The `echo` command displays the current value.

Execution Flow:


Iteration 1 → 1
Iteration 2 → 2
Iteration 3 → 3
Iteration 4 → 4
Iteration 5 → 5

Example 2: Create Multiple Folders

@echo off
setlocal
for %%i in (1 2 3 4 5) do (
    mkdir Folder-atul-%%i
)

 

Result

The script creates the following folders:


Folder-atul-1
Folder-atul-2
Folder-atul-3
Folder-atul-4
Folder-atul-5

Explanation

For each number:

* The loop runs once.
* `mkdir` creates a new folder.
* `%%i` is appended to the folder name.

This saves time compared to manually creating multiple folders.

Why Use FOR Loops?

FOR Loops are useful when:

• * Creating multiple folders
• * Renaming files
• * Processing log files
• * Running repetitive commands
• * Automating administrative tasks

Instead of writing:

mkdir Folder1
mkdir Folder2
mkdir Folder3
mkdir Folder4
mkdir Folder5


you can use a single FOR Loop.


Real-World Uses for System Engineers

System Engineers commonly use FOR Loops for:

• Bulk folder creation
• File management
• Log collection
• Backup automation
• Software deployment tasks
• User account processing

FOR Loops are one of the most frequently used automation tools in Batch Scripting.

Interview Questions

What is a FOR Loop?
A FOR Loop is used to repeat a command for each item in a list.


What does %%i represent?
It is the loop variable that stores the current value during each iteration.


Why are FOR Loops useful?
They reduce repetitive code and automate repetitive tasks.


Which command is used to create folders?
mkdir


Can FOR Loops be used in automation scripts?
Yes. They are widely used in system administration and automation tasks.

Conclusion

The FOR Loop is one of the most powerful features of Batch Scripting. It allows you to repeat tasks efficiently and automate routine operations. Whether you're displaying values, creating folders, or processing files, mastering FOR Loops will make your scripts cleaner and more effective.

As a future System Engineer or SecDevOps professional, understanding loops is an important step toward automation and scripting mastery.