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Exchange server 2013 - Outlook doesnt connect, but OWA works fine

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Hi,

I have a exchange environment with 2 mailbox server configured DAG and 2 Client access servers, ... One of the CAS servers is configured as withness server for failover cluster.

CAS are configured with DNS round robin where same A record with different IP of cas a and cas b are added.

OWA is working fine, connected sending and receiving mails

However Outlook clients 2007 2010 and 2013 are not connecting and doesn't send receive and send email. It works fine for few days then suddenly it stops working. Its not that outlook never worked. It works and after few days doesn't. Usually we restart all the 4 servers until it starts working again.

This time it  is not working after restarting also

there was Error 106 performance counter, we reset the performance counter using the script

I have observed Error IDs.  1003 106 1008 1023 1111 2001 2004 4109 15021  in the last 24 hours

Please advice

Thank you

Regards

Mubasher


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