Get a known-working laptop, plug it directly into the SAN switch's LAN port, set the laptop IP accordingly, test, if that works then the problem is downstream of the SAN switch, if it doesn't work it's the IP setup on the SAN switch so fix that.
If it wasnt the SAN switch then get the same laptop, plug it into the SAN switch's LAN switch port, set the laptop's IP accordingly, test, if this works you have a patching problem (so fix that), if not you have a LAN switch port problem; either a dead port or a misconfigured port/switch.
Get a known-working laptop, plug it directly into the SAN switch's LAN port, set the laptop IP accordingly, test, if that works then the problem is downstream of the SAN switch, if it doesn't work it's the IP setup on the SAN switch so fix that.
If it wasnt the SAN switch then get the same laptop, plug it into the SAN switch's LAN switch port, set the laptop's IP accordingly, test, if this works you have a patching problem (so fix that), if not you have a LAN switch port problem; either a dead port or a misconfigured port/switch.
The end.