The queued builds are not getting started: Error occured while trying to create new build log file

Symptoms

• The queued builds are not getting started.
• The build agents are connected and available. Their status is idle.
• The teamcity-server.log has the following entries:

[2025-08-19 12:20:25,356]   WARN -   jetbrains.buildServer.SERVER - Error occured while trying to create new build log file: <Internal Artifacts Storage Path>\...\.teamcity\logs\buildLog.msg5: java.io.IOException: Access is denied (enable debug to see stacktrace) 
[2025-08-19 12:20:25,357]   WARN -   jetbrains.buildServer.SERVER - Could not start changes collecting for build promotion: Build promotion {id=211870, configuration={id=Products_ArsDriverVisionCamera_VideoProcessingPlatform_Dependencies/bt1308}}: jetbrains.buildServer.serverSide.buildLog.BuildLogCreationException: Error occured while trying to create new build log file: <Internal Artifacts Storage Path>\...\.teamcity\logs\buildLog.msg5 (enable debug to see stacktrace)

Cause

java.io.IOException: Access is denied when starting a new build and creating a build log for it, indicates issues with the TeamCity server's access to the internal artifacts storage.

Resolution

Make sure that:

1. <Internal Artifacts Storage Path> is accessible from the TeamCity server machine, there are no network interruptions, and the user that is used to run the TeamCity Server process (or Windows Service) has read/write access to it. TeamCity assumes reliable and persistent read/write access to the TeamCity Data Directory and internal artifacts storage, and can malfunction if they become inaccessible.
2. The device where <Internal Artifacts Storage Path> is located has free space.
3. No antivirus or firewall is blocking the TeamCity Server process from writing files to <Internal Artifacts Storage Path>.

Additional information

• Recommendations as to choosing Data Directory Location
• Built-in Artifacts Storage