PleskMainDBException Problem

I have Plesk 11 on windows server 2008 R2.
i see that Plesk control panel and all php+mysql websites  stopped working after some time of restarting server , then i got this message :

ERROR: PleskMainDBException
An operation on a socket could not be performed because the system lacked sufficient buffer space or because a queue was full.

i tried many solutions , including the one below :

http://forum.parallels.com/showthread.php?258229-ERROR-PleskMainDBException

but the problem does not solved untill now , can any one help ?
EngAhmedFarisAsked:
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EngAhmedFarisConnect With a Mentor Author Commented:
it seems that the server was very busy serving mail server queues and this causing the problem .
i solved mail server problem and then every thing ok now.
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EngAhmedFarisAuthor Commented:
Also all php websites show this error :

MySQL :: Can't Connect To MySQL Server On 'localhost' (10055)
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