After working for the past six months, a server no longer can see its storage. A switch port where the server is connecting indicates that there is no connection. An administrator moves the cable to…

Switch firmware issues are less likely to cause a complete loss of physical link on multiple ports specifically for one server while other devices on the switch are presumably working.

If a server can no longer see its storage and multiple switch ports indicate no connection after trying different ones, the issue is most likely with the server's Host Bus Adapter (HBA) or the cable connecting it. The HBA is the server component responsible for initiating the connection to the SAN fabric; its failure would prevent any physical link from being established.

Zoning configuration issues would typically allow a physical connection (link light) but prevent logical access to storage, not result in a 'no connection' state on the switch port.

Since the issue persists even when the cable is moved to a different switch port, the problem is unlikely to be a faulty SFP in the original switch port, as the new port would use a different SFP.