Office 365 connector not validating

1.pngso all of a sudden some emails stop flowing and my connector is not validating, been setup for years and we did not change any server or network settings

i have Office 365 and a hybrid server - exchange 2010

the emails that are failing are coming from my mercury server and flows thru my exchange to office 365. i have contacted microsoft support but they are saying its an internal issue.
IT GuyAsked:
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Vasil Michev (MVP)Commented:
That's usually a firewall/network issue, so talk with your network folks.
IT GuyAuthor Commented:
i am the network folk lol - did not made any network changes and we also whitelist office 365 IP's
Vasil Michev (MVP)Commented:
Well, simply try bypassing your firewall devices. Socket error 10061 is usually caused by something blocking the connection.
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IT GuyAuthor Commented:
on my firewall syslogs i see this error - could this be why?

ASA-4-106023: Deny tcp src WAN: dst LAN:exchange ip address by access-group "OUTSIDE_access_in" [0x0, 0x0]

from an ip lookup the ip address seems to be a microsft ip
Vasil Michev (MVP)Commented:
Most likely. It seems to correspond to one of the EOP servers, so if your firewall is blocking the connection to it it might as well be what's preventing the connector from properly functioning. Simply run a test with disabling/bypassing the firewall to be sure.

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IT GuyAuthor Commented:
i added the EOP ip ranges in the firewall and it resolved - thanks so much
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