This is to all I hope helps. The problem here has been found. I caused very much grief to me and my whole department.
Since I received the notification of the last post by Mohammad I thought it necessary to let you know what we found.
Our environment has the exact same CUCM 8.5, behind 65xx...
Can you maybe share the tac case number here, or the other suggestions tac made besides the arp change that corrected the problem?
We are having a very similar problem, with cucm 8.5.1 and have not yet found the problem, tac says it is not cucm, we get the tcp keepalive socket error.
Thanks
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