vlan 1 name "DEFAULT_VLAN" no untagged 1-17,23-24 untagged 18-22,A1-A2,B1-B2 ip address 192.168.3.22 255.255.255.0 ip helper-address 10.3.1.30 exit vlan 3 name "Irvine Local LAN" untagged 1-17,23-24 tagged 18-22 ip address 10.3.1.22 255.255.255.0 exit
One thing I notice is that your IP helper address for VLAN 1 is the same as your IP for the PC, so I'm guessing that IP is some sort of DHCP server, which may be causing a conflict.
Since the SG200 can ping devices in VLAN 3, and it is in VLAN 1 (since that is the default) then we know the trunk and routing seem to be working correctly.
Has anything been able to ping that host? Have you checked the firewall on the host, most of them will block pings from other subnets by default.
You can also try running a traceroute from various places and see where the traffic stops, that device will either be blocking or routing incorrectly. Of course any device in the same subnet/VLAN should just go directly there without any hops, so that would again point to a firewall issue, or possibly a missing return route if it is from a different VLAN.
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