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# Troubleshooting

Refer to this section for solutions to issues that may arise with interfaces and routing.

If you notice configuration errors after having renamed an interface from SMC

- Situation: You wish to rename an interface on a firewall that is managed by SMC, and the implicit objects Firewall_xx and Network_xx that are attached to this interface are not automatically renamed on SMC. This will cause configuration errors since the objects no longer reference an interface that exists on the firewall.
- Cause: Firewall_xx and Network_xx are implicit objects that can be used in SMC in the configurations of several firewalls. They are not deployed on firewalls. As such, when you rename an interface, these implicit objects will not be automatically renamed.
- Solution: To rename an interface, and work around the issue, we recommend that you follow the procedure indicated in Using implicit objects from SMC.