Note: this post is getting frequent updates; please keep checking back. Last update: 3/19/2021
Microsoft has released a set of out of band security updates for vulnerabilities for the following ver...
Updated Mar 19, 2021
Version 44.0
Blog Post
Nino_Bilic Sorry if I'm coming across a little harsh. As I read the post, it was not clear to me that the cause of the ECP or OWA not working would be stopped services. I took the note below the install workaround instructions to be a possible side effect as I've seen that in the past, regardless of how the update was applied. As the post says the issue occurs because some services aren't properly stopped, I thought that would likely mean some files wouldn't be appropriately updated/settings applied and, as such, the services break. I would THINK a re-install of the patch (the second successful install I did of it) would resolve the issues. Unfortunately, that has not been the case.
Yes, OWA works, but ECP is broken. All services appeared to start properly (except POP/IMAP but we don't use them anyway). Attempting to access ECP provides login, then redirects to a bad URL (http://localhost/owa/ecp) which returns an unhelpful error, Bad Request. I expect it to redirect to
https://localhost/ecp/?ExchClientVer=15
I've since found it I go to https://localhost/ecp/?ExchClientVer=15 directly, everything works. Seems it's just the handoff from the login to the admin center
Perhaps it's just bad timing and something else is wrong not related to the patch.