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Re: [m2e-users] M2E consumes all available user ports and does not recover

Do you have a small standalone example project and exact steps to
reproduce the problem?


On 12-07-13 9:21 PM, Stepan Vavra wrote:

I'd like to discuss a problem that users might experience on some
platforms such as Windows XP.

When M2E needs to download lot of artifacts (e.g. during an import of
huge multimodule project when local artifact cache is completely free)
it may consume all available user ports for the TCP connections (Windows
XP has 5000 by default) and it's not possible to make more connections
(till OS frees user ports after a timeout (which is 4 minutes on Windows

When such a problem occurs it logs following record in .lastUpdated file
for a specific artifact:

commons-codec-1.3.pom.lastUpdated   contains (as an example):

http\://repo1./maven/.org//maven2//.error=Could not transfer artifact
commons-codec\:commons-codec\:pom\:1.3 from/to central
(http\://repo1./maven/.org//maven2/)\: Address already in use\: no
further information to

The problem is that M2E is not able to recover from this problem (even
when the ports are available again) and the only way how to fix this is
to either run the build from command line (maven 3.0.4 will download the
artifacts that M2E wasn't able to) or clear the local artifact cache.
I think, this could be considered as a bug.

Anyway, you can tweak Windows registry which worked like a charm for me:
As described in
You may want to tweak:
*TcpTimedWaitDelay, **MaxUserPort*, *MaxConnect Backlog

Official Microsoft statement:

Best regards,*
Stepan Vavra

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