F3726, F3211, F3174, R5135, R3816-HP Firewalls and UTM Devices Network Management Configuration Guide-6PW100

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5. If the peer ttl-security hops command is configured, verify that the command is configured on the
peer, and the hop-count values configured on them are greater than the number of hops between
them.
6. Verify that a valid route to the peer is available.
7. Use the ping command to verify the connectivity to the peer.
8. Use the display tcp status command to verify the TCP connection.
9. Verify whether an ACL is applied to disable TCP port 179.