I'm struggling with this SSL error message during the On-premises to Microsoft Exchange Online Migration.
Let me give you some information first:
- Exchange 2013 - 15.0.1497.2 CU23
- AD Sync in place and working
- TLS 1.2 is enabled
- On firewall SSL inspection is off
- Basic Auth activated on the WinRM
- MOST IMPORTANT: this have being working for days! We have already migrated a few mailboxes for testing and was working. Now we needed to migrate all the others, it stopped working. No updates or reboots of the Exchange servers have being done.
Do you guys have any ideas?