Unable to telnet to localhost after CU5

Hi
We upgraded E2013 to CU5 on Sat 13 - On Thu 18 at 9:12 all 4 CAS servers stopped processing mail
error from smarthost:
421 4.3.2 The maximum number of concurrent connections has exceeded a limit, closing transmission channel
unable to telnet locally: telnet localhost 25
421 4.3.2 Service not available
netstat -an | find "25" shows port is listening
Test-SmtpConnectivity shows success
Any ideas appreciated
shapi

Hi ,
Please check the below mentioned links
http://social.technet.microsoft.com/Forums/exchange/en-US/6cb89070-6c17-4f80-8ad1-b4bfff8c8ed6/432-the-maximum-number-of-concurrent-connections-has-exceeded-a-limit-closing-trasmission-channel
http://social.technet.microsoft.com/Forums/exchange/en-US/62ccfbd1-9b1e-4e67-94be-692b725428a3/exchange-cas-array-exceeds-max-number-of-concurrent-connections?forum=exchange2010
Please reply me if you have any queries.
Thanks & Regards
S.Nithyanandham
Thanks S.Nithyanandham

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