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After installation of Service Pack 3 for Microsoft Exchange 2010 some of you can expirience problem with remote connectivity to Microsoft Exchange.
When you run OWA or Outlook Anywhere you can get error like below:
HTTP 440 – 440 response was received from Unknown
You will see this problem on CAS servers where you have enabled HTTP Redirection in IIS on Exchange web sub directories like:
To fix this issue you need to open IIS on CAS server, next check option:
Redirect requests to the destination
on every exchange web services and uncheck this option.
All the marked directories should have the setting unchecked:
Next you need to run IISReset
If you don’t have redirection applied you will not have this issue.