Just recently upgraded Exchange 2013 to CU22, now I am unable to create new mailboxes but I can update / change settings on already created mailboxes within SolidCP.
When creating new mailboxes, the following error is produced – The WinRM client received an HTTP bad request status (400). No settings have been changed on the SolidCP server after the upgrade.
Most easy is to check it in ECP,
It needs “Integrated Auth” checked (and nothing else) on the auth tab.
After thats correctly set you could do an iisreset as sometimes it caches the connection/ auth method.
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