Can't connect to client (58) - Strange problem

Hi all,

I have this error and it's very strange.
The policy worked until two days ago, there have never been any problems and now I get the error 58. There were no changes to the network and for that I can not understand what happened.
Master and Media are on Red Hat Linux, version 7.5.0.6.
The client is Microsoft Widows 2008, version 7.5.0.6.

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