‘Response with status: 401 Unauthorized for URL’ while performing Update Manager tasks on Firefox in vSphere 6.5

Updating to vCenter Server 6.5 Update 2d has brought long-awaited support for the vSphere Update Manager (VUM) functionality to vSphere Client.

However, you should be aware of some incompatibility between a VUM plug-in in vSphere Client and Mozilla Firefox.

Update Manager gives a ‘Response with status: 401 Unauthorized for URL‘ error message at random occasions when used with the recent versions of this web-browser (tested with Firefox 63.x and 64.x):

Searching on the VMware’s web-site led me to the KB 59696 that describes the similar issue in vSphere 6.7 and the workaround provided worked for me.

First you need to clear the browser cache:

Then stop Firefox from caching pages by modifying the browser’s default configuration:

According to VMware, they are currently working towards resolving this issue in future releases.

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