Hello, thanks for the reply, here are the answers to those questions
If I understand correctly, you have a ClearPass service configured for wired MAC auth and using Static Host List as an authentication source, right?
CORRECT
Do the devices that are not affected by the issue use same CPPM service?
THEY DO
What is the port config at your HP 5412zl?
aaa port-access authenticator B1-B24
aaa port-access authenticator B1-B24 auth-vid 104
aaa port-access authenticator B1-B24 Client-limit 1
aaa port-access authenticator B1-B24 quiet-period 30
aaa port-access authenticator B1-B24 logoff-period 862400
aaa port-access authenticator active
aaa port-access mac-based B1-B24
aaa port-access mac-based B1-B24 logoff-period 862400
aaa port-access mac-based B1-B24 quiet-period 30
aaa port-access mac-based B1-B24 auth-vid 104
Do you see any activity in the CPPM Access Tracker at the time when the connection of the PC's is lost?
No and when plugged in again/rebooted they reconnect normally
Does your HP 5412zl display any log events for the affected ports at the time of the issue?
Actually I double checked this and I found some port messages on the log around the same time:
Port xxx is now off-line
Port xxx is blocked by STP
Port xxx is blocked by AAA
Port xxx is now online
seems to repeat several times - but might be normal behaviour
Is it possible that your HP 5412zl loses connection to the CPPM at the time of the issue?
It is possible, would that cause them to disconnect?