Exchange Performance Query related to TLS upgrade

Posted on 2016-07-19
Last Modified: 2016-07-24

We are running Mcafee SAAS to secure our exchange 2010 communications. Recently we switched from TLS 1.0 to TLS 1.2 and ever since then several of our applications which do batch mailouts of reports have been taking a long time to email.

As far as know no other changes have occurred in the network.

How would I go about troubleshooting this from the exchange end?

Any assistance is appreciated.

Thank you
Question by:Zack
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LVL 33

Expert Comment

ID: 41720279
Do they send using SMTP ?! did you configure SMTP to use SSL !?

Author Comment

ID: 41720285
Hi Mahmound,

Yes, it sends using the SMTP and SSL used as well.

Thank you.
LVL 33

Expert Comment

ID: 41720290
would this be causes because you lack this update
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Author Comment

ID: 41720989
Hi Bushbar,

My apologies for not getting back to your sooner. Thank you for the update link I will check. A query how would this cause performance issues?

Thank you.
LVL 33

Accepted Solution

Busbar earned 500 total points
ID: 41721021
I think, and I might be wrong, that apps are trying to connect using TLS1.2, timesout then fails back to 1.0 or something like this, wireshark sniffing will help for sure.

Author Closing Comment

ID: 41726849
Hi Busbar,

Finally worked it out via wireshark it was an issue with TLS timeout but it was only occurring on one of the relay servers.

Thank you.

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