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Summary: Learn how to effectively resolve the IBM/Lotus Notes Error 1325 with our comprehensive guide. Discover step-by-step solutions and expert tips to overcome this issue and ensure uninterrupted email communication. Resolve Error 1325 swiftly and get back to seamless Lotus Notes functionality.

IBM Lotus Notes stands as a top-tier business email client, ideal for organizations seeking comprehensive email and collaboration services. This software distinguishes itself with a range of exceptional features, including robust security options, seamless file attachments, and the capability to send encrypted emails.

IBM Lotus Notes is a robust, multithreaded email client equipped with a comprehensive suite of tools, suitable for both online and offline work modes. Beyond email, it excels in organizing and automating business processes, applications, and team collaborations. Renowned for its robust security features, IBM Lotus Notes seamlessly operates on Windows, Linux, and Mac operating systems, ensuring efficient performance across diverse platforms.

Despite its wealth of features, IBM Lotus Notes users occasionally encounter issues. One common problem reported by users is Error 1325, which can disrupt data access. ‘Lotus Notes Error 1325 – not a valid filename’ is a recurring issue with multifaceted causes.

In this article, we will delve into effective methods for resolving Lotus Notes Error 1325, providing unique solutions to tackle the issue. Additionally, we’ll explore an alternative approach to rectify this error, ensuring a comprehensive guide for users facing this challenge.

Causes of Lotus Notes Error 1325

Lotus Notes Error 1325 can manifest due to various factors, including system shutdowns and network interruptions. However, the most prevalent culprits behind this error include:

  • The Lotus Notes software is not installed properly on the system.
  • A virus or other malware infects the computer memory.
  • There has been some corruption in the operating system registry files.
  • There has been some corruption in the Notes installation files.
  • The user account does not have permission to access Lotus Notes on the system.
Lotus Notes Installation Error 1325 Indicators

The fortunate aspect is that when this error is about to occur, there are often warning signs. The error typically presents the following messages as precursors:

  • The notice “Error 1325 – is not a valid file name” is shown directly.
  • While operating, the local machine freezes for a few seconds.
  • The response time to keyboard and mouse input is slow.
  • The presently open window shuts suddenly.
  • When an application is running, the entire system crashes.
Ways To Resolve Lotus Notes Error 1325 Manually

Lotus Notes Error 1325 is a frequent occurrence during the connection attempt between your Lotus Notes client and the mail server. This error may surface due to network connection corruption, incorrect settings within the Domino server, driver or registry complications in the client, among other factors. To tackle this issue, consider employing one of the following manual solutions.

Update Your System Drivers

This common error may occur when your system drivers become outdated. Consequently, it’s essential to periodically verify and update your system drivers.

  1. Launch Control Panel on your local PC.
  2. Select Device Manager from the menu.
  3. Right-click the unit and select Properties from the drop-down menu.
  4. Choose Update Driver Software from the drop-down menu.
  5. Your system Drivers will be updated.
Check for Corrupted Registry Entries

When encountering this error, it’s possible that your computer’s registry entries related to Lotus Notes have become corrupted. To address this issue, you can either manually repair these entries or opt for third-party software solutions.

  1. Type Run into the search field.
  2. Enter Regedit in the Run window and press Enter.
  3. Select File -> Export from the File menu.
  4. Choose the path where you want to save the file with the REG extension.
  5. Select the REG extension and double-click it.
  6. It will resolve the registry error by restoring it.
Not Enough Storage

At times, the error may arise when there’s insufficient space on the drive where Lotus Notes is installed. In such instances, it’s crucial to assess available disk space and free up room by relocating or deleting unused files. If required, consider moving your Lotus Notes installation to an alternative drive or removing unnecessary files. Additionally, migrating IBM Notes emails to Office 365 can alleviate storage issues.

Server Configuration

To address the compatibility issue between your Lotus Notes client and Lotus Domino server, examine the path and port settings. This can often be resolved by verifying the configurations of the Domino server.

To troubleshoot, navigate to your Lotus Domino server’s ‘Lotus Notes Client Access Settings,’ accessible via Control Panel -> Administrative Tools -> Internet Information Services (IIS) Manager.

Check The Version

The Lotus Notes client version 6.0 may encounter compatibility issues with Domino server versions 4.6 and 5.0. To resolve this, consider upgrading to a more recent Lotus Notes client version that aligns with your Domino server’s compatibility. Options include versions like 8.5x, 8.5, 8.5, or 8.5xm, depending on your specific requirements. You can access the upgrade via the IBM support site or the IBM developers’ network website.

Update IBM Lotus Notes

Another method to resolve the error is to update your IBM Lotus Notes software. Occasionally, Error 1325 may be triggered by the usage of an outdated version of IBM Lotus Notes.

  1. Open your computer’s Control Panel.
  2. Right-click the Lotus Notes program in the Program Files folder.
  3. Choose Uninstall from the drop-down menu.
  4. Now, download and reinstall the application again and see if the error is gone.

If none of the aforementioned methods prove successful, the optimal solution is to leverage an automated tool like Kernel for NSF to PST Converter. This tool excels in resolving corruption errors and facilitating file conversion to PST format. Powered by advanced algorithms, it can efficiently scan corrupt NSF files and convert them to Outlook PST format. Moreover, the tool supports batch conversion, enabling you to process multiple NSF files simultaneously.


IBM Lotus Notes is a valuable utility, widely adopted by businesses for efficient email communication and data management. Nevertheless, it is susceptible to errors like 1325, which can potentially harm your data. This article emphasizes the distinct methods to rectify Lotus Notes Error 1325 and introduces an alternative tool for swift convert NSF files into PST. Once converted, your NSF files become accessible within the MS Outlook application.

Kernel for Lotus Notes to Outlook