Problem and solution when an OSPF neighbor relationship fails to be established between the interconnected firewall and NE40E if OSPF MD5 authentication is configured on the devices

The reason that an OSPF neighbor relationship fails to be established between the interconnected firewall and NE40E if OSPF MD5 authentication is configured on the devices is that OSPF authentication is configured but not enabled on the firewall interface. You need to configure authentication-mode md5 in the corresponding area to enable the OSPF authentication mechanism. OSPF authentication needs to be configured only on the interface connecting the NE40E to the firewall.

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