We have Kaspersky security center 12 (Kaspersky Endpoint Security for Windows 11.4.0.) and Kaspersky Security Center Network Agent.
Windows Version : Windows Server 2019 Std.
We use Hyper-V replication from primary server to secondary server which uses port 80 Kerberos for replication and both server have kaspersky.
Now from past 3 to 4 days replication automatically stopped and port 80 is not reachable for primary to secondary so after troubleshooting i found that kaspersky is culprit after exit replication is working fine.
I have checked polices “Firewall” policy is already disabled.