After a server reboot, the server no longer can connect to the iSCSI network. The switch port shows no connection and moving the cable to a new port did not produce a positive result. Which of the fol

Disabling and re-enabling switch configuration is unlikely to resolve a problem where the switch port itself reports no connection, especially after moving the cable, as this points to an issue on the server's end rather than the switch's configuration.

Replacing the FC cable is irrelevant because the problem is with an iSCSI network, which typically uses Ethernet cables, not Fibre Channel (FC) cables. Furthermore, the problem persisted even after moving the cable, suggesting the cable itself isn't the primary issue.

Disabling the firewall would only be relevant if there was a connectivity issue at the protocol level (e.g., iSCSI initiator failing to log in), but since the switch port shows no physical connection, the problem is at a lower, physical layer.

Since the switch port shows no connection even after trying a different switch port with the same cable, and the issue occurred after a server reboot, this strongly indicates a failure of the server's Network Interface Card (NIC). Replacing the NIC is the most logical next step to restore connectivity.