We have some integration tests launched from freestyle jobs. They are MSBuild projects which launch Nunit tests.

The main build steps run ok and are over in ~17-18 minutes. However, the build hangs at the end - where the communication with the master is supposed to happen (for example when publishing the reports, or when sending the email notification). I've removed the email notification and the Nunit report publishing, and the build still hangs:
"Time Elapsed 00:16:10.09
Build step 'Build a Visual Studio project or solution using MSBuild.' marked build as failure").
We've had build hanging for as much as 11 hours .

I've tried different connection settings: Windows service, JNLP - nothing helps.

I'll attach the server & slave dumps.

If there are any fixes for this, that I missed in the recent changelogs, I'll update Jenkins. But I don't see any possible fixes for this problem.