A few days ago our production cluster CRASHED completely, 300 VMs went crazy. It affected more than 2k people. I spent 8 hours on the phone with Microsoft and they couldn’t fix.
After, some time I found that SMB traffic is getting blocked. I asked our networking team if they did any changes on routers, switches, the answer was no.
I decided to disabled Windows Firewall and restart VMMS service. Which fixed the issue. Later I found on the internet that ” We later discovered this problem to be related to a known issue with IP Sec offload being enabled when the firewall is also enabled. Disable IP Sec Offload “
I hope that this helped you guys. Have a good one.