Need Help Regarding Unstable IIS FTP Server after Windows Server 2025 Upgrade

Two days ago, I upgraded my Windows Server from 2019 to 2022. Since then, I have been trying to reconfigure the FTP sites using the IIS console. The configuration should be exactly the same, except for the server version. However, I have encountered some issues.

Symptoms

When I try to start the FTP site, IIS reports an error. The error message varies, but it usually says that the FTP service failed to start due to an unspecified error. Sometimes, IIS just doesn't respond at all.

Troubleshooting

I have tried several troubleshooting steps, but none of them have worked:

• I have checked the event viewer logs for any errors related to IIS or FTP.
• I have checked the IIS logs for any suspicious activity.
• I have restarted the IIS and FTP services multiple times.
• I have checked the FTP site bindings and made sure they are correct.
• I have checked the FTP site configuration and made sure it is the same as before the upgrade.

Code Snippet: FTP Site Configuration

Possible Causes

Based on my research, there are a few possible causes for this issue:

• The FTP module in IIS 10.0 (which is included in Windows Server 2022) is not backward compatible with older FTP site configurations.
• The FTP service is not configured correctly after the upgrade.
• There is a compatibility issue between IIS and a third-party FTP component that was used before the upgrade.

Solutions

Here are some possible solutions:

1. Upgrade the FTP site configuration to the new format used by IIS 10.0. This can be done manually or using a script.
2. Reinstall the FTP service and configure it from scratch.
3. Uninstall any third-party FTP components and use the built-in FTP service instead.

Code Snippet: Upgrading FTP Site Configuration

# Load the old FTP site configuration $config = Get-Content -Path "C:\path\to\old\config.xml" # Convert the old configuration to the new format $newConfig = $config -replace '', '' $newConfig = $newConfig -replace '', '' $newConfig = $newConfig -replace '', '">' # Save the new configuration $newConfig | Set-Content -Path "C:\path\to ew\config.xml"

References

Here are some resources that might be helpful:

• Configuring Security for FTP and SFTP in IIS 10
• Configuring Secure FTP in IIS 10
• Troubleshooting FTP in IIS 10