While applying a cumulative update I ran across the following error.
Warning: An unexpected error has occurred and a Watson dump is being generated: Could not find a part of the path 'C:\Windows\Temp\ExchangeSetup\bin\EnterpriseServiceEndpointsConfig.xml'.
The Exchange setup log essentially repeated this same error, without any additional clues. The C:\Windows\Temp\ExchangeSetup\ folder is a staging area used by setup to unpack temporary files. These files are copied to this temporary location during the ‘Initializing Setup’ and ‘Copying Files’ steps.
When navigating to this folder it became apparent that not only was the file in question missing but the entire parent folder too.
Comparing this temp folder to a server whose cumulative update applied successfully we spotted even more missing folders. The screenshot below is what the unpacked temporary setup folder should look like.
It’s unsure what caused this. Immediate suspicion could indicate an antivirus solution. However, we had completely unloaded the antivirus solution from memory prior to the start of setup.
Oddly running set up a second time, and allowing the temporary files to unpack again, fixed the issue. The folders all appeared and the cumulative update finished without incident.
This error is still a mystery to us. However, it seems simply rerunning setup resolves the issue. If you have encountered this error before and identified a root cause, let us know by dropping a comment below.
Have you seen this issue before? What did you do to fix it? Drop a comment below or join the conversation on Twitter @SuperTekBoy