0x80072F78: The server returned an invalid or unrecognized response

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Error Message: 0x80072F78:The server returned an invalid or unrecognized response

Symptoms

Outlook customers may get this error message time to time:

0x80072F78:The server returned an invalid or unrecognized response

Reason

On Microsoft support website this error code 0x80072F78 is defined as "ERROR_WINHTTP_INVALID_SERVER_RESPONSE"

These errors are caused by small interruptions in communications between the computer to be updated and the update to be downloaded. These issues usually resolve themselves but sometimes not.

Solution

In order to fix this issue please follow the following official Microsoft Fix:

Official Microsoft Support Link
Note

If the above repair method does not solve your problem. Then please contact directly Microsoft Support.

Here are some links to their support pages

Contact Microsoft Support Link 1
and
Contact Microsoft Support Link 2

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