Some healthcheck.htm requests do not respond (dropped connection)

Hi,
Several (most) of the services on our Exchange server don't return a valid response when querying their "health check" URL.
These are OK:
 - /ecp/healthcheck.htm (200 OK)
 - /owa/healthcheck.htm (200 OK)
 - /powershell/healthcheck.htm (200 OK)
But these fail with an instantly dropped connection:
 - /autodiscover/healthcheck.htm
 - /ews/healthcheck.htm
 - /mapi/healthcheck.htm
 - /Microsoft-Server-ActiveSync/healthcheck.htm
 - /oab/healthcheck.htm
 - /rpc/healthcheck.htm
There are no errors or warnings noted in the event logs, and all services work normally for all users, but I don't see the failed requests in IIS' logs.
What can be causing this?
Thanks!

Hi,
According to your description, the health check URL cannot work for certain requests. And I’d like to confirm if there is any connection issue for your clients.
Based on my research, here is a similar thread:
http://social.technet.microsoft.com/Forums/ie/en-US/e9ee04de-9b62-44e7a-85db-3fff160dddd2/healthcheckhtm-not-accessible-for-several-protocols?forum=exchangesvradmin
We can try to restart Exchange Health Manager service to resolve the issue as the above thread.
Thanks,
If you have feedback for TechNet Subscriber Support, contact
[email protected]
Angela Shi
TechNet Community Support

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