build hung right after start

Hello,

a simple build hung right after start. The only build log on the teamcity is:

[09:05:00] The build is removed from the queue to be prepared for the start

[09:05:00] Starting the build on the agent XY

And it was hunging there for 29 hours.

The only log i still have from this time comes from teamcity-vcs-log from the agent and does not tell me much:

[2018-07-29 09:05:00,695]   INFO - ldServer.AGENT.PollingProtocol - New command is received from server "runBuild" {id = 362}
[2018-07-29 09:05:00,711]   INFO -    jetbrains.buildServer.AGENT -


 
[2018-07-29 09:05:00,711]   INFO -    jetbrains.buildServer.AGENT - ===================================================
[2018-07-29 09:05:00,711]   INFO -    jetbrains.buildServer.AGENT - Starting Build {id=2447051, buildTypeId='abc_abc', buildTypeInternalId='bt908', personal=false, checkoutType=ON_SERVER}
[2018-07-29 09:05:00,711]   INFO - mpl$TeamCitySpringSubContainer - Refreshing SubContext: running build context id=2447051: startup date [Sun Jul 29 09:05:00 CEST 2018]; parent: jetbrains.buildServer.agent.AgentMain3$3@ererdfgg
[2018-07-29 09:05:00,930]   INFO - uildStages.BuildStagesExecutor - Call stage jetbrains.buildServer.agent.impl.buildStages.startStages.LogAgentParametersStage
[2018-07-29 09:05:00,945]   INFO - uildStages.BuildStagesExecutor - Call stage jetbrains.buildServer.agent.impl.buildStages.startStages.ClearExpiredBuildWorkingDirectoriesStage
[2018-07-29 09:05:00,992]   INFO - ies.DirectoryMapUnknownCleaner - Checking not listed in directory.map folder D:\TC\qaterwf65zzb67u.

Is there a chance to figure out what happened?

thank you in advance,

K