Auxiliary copy is stuck at 30%

Our weekly secondary AuxCopy is stuck at 30% since this weekend (so that it is blocking all the primary disk to disk incremental copies), with the below 2 error messages

Thinking it might be some ports communication issue between the Media Server (S01190) where the tape library is attached to, and the CommCell Server (S02116), so I did the below ports check between the 2 Servers:

Telnet from the Media Server (S01190) to the CommCell Server (S02116)

Port 8400        OK

Port 8401        OK

Port 8403        OK

Telnet from the CommCell Server (S02116) to the Media Server (S01190)

Port 8400        OK

Port 8401        Not OK

Port 8403        Not OK

Now, before I speak to our Network/Security administrator who have recently installed SentinelOne AV on both of the above 2 Servers, I’m wondering if I’m heading the right direction, and if I have done all the ports checking ? 

Thanks,

Kelvin