MS Exchange blocked port 6556

Hello,

have anybody seen that that MS Exchange Search Service blocked Agent port 6556?
On one Exchange 2019 in our custom environment the checkmk service will not deliver data when MS Exchange 2019 has started the Search Server. This service block the port 6556. Is there anybody to know if Search Service can configured a specific port?

Thanks in advanced,

Christian

I’ve never heard of that port being used by MS Exchange (or any of its services). But then, I’m not an Exchange admin anyway.

Can you check with netstat if that port is really in use by the search server?

Also no problems here with actual Exchange servers.

Yes, we did had a look at netstat and the port was blocked by this service, but only on one Exchange!

Is always the first time that I saw this.

A restart of MS Exchange Search Service solved the problem. Strange behavior!

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