Unwanted traffic port 444 from Microsoft to OnPrem exchange

Hello, We operate a Hybrid Exchange environment with an on premise Exchange 2016 server (Srv A) at a site with decent internet connectivity and another Exchange 2016 (Srv B) at a remote site with...

2016

exchange online

Exchange Server

hybrid

kogian88

Copper Contributor

Jun 10, 2023

Hi ,

We have the same issue. Did you manage to figure out any solution ?

Thanks

ITJon1545

Copper Contributor

Jun 10, 2023

Hi kogian88,

Glad we're not the only ones! We opened a ticket with MS after not getting any traction here and rather coincidentally they closed it without solution just yesterday.

We had a number of calls with engineers as well as providing a number of logs etc but there never seemed to be any acknowledgement of the pre-caching and I felt like it never got passed up out of level 1 support.

Our solution has been to disable the ActiveSync IIS sub directory on Srv A which stops the traffic being proxied over the slow link. It also stops anyone who is using Outlook Mobile talking to Srv A directly which is a shame but not as significant as the link being saturated. We can still use OWA via SRV A so people who need to can get to their mailboxes that way.

I plan to query the closing of the ticket as the issue remains and I do not believe they have acknowledged it. The pressure is however off for us with the fix above.

Would love to know more if you make any other progress.

Thanks,

Jon

kogian88
Copper Contributor
Jun 30, 2023
HiITJon1545 ,

Try to remove the account from the mobile device for 7-10 days and then re configured it. Let me know if that works.

Regards.
Giannis

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Unwanted traffic port 444 from Microsoft to OnPrem exchange

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