Can't connect to a host on ipv4, but can on 1pv6

[fosslibrarian]

I wonder if anyone can help me diagnose a really odd issue. I have a server in a different vlan that I can't connect to on ipv4.
I can  connect on ipv6.
I can connect from the same VLAN on ipv4.
I can connect to other servers on the same VLAN over ipv4 normally.
I can connect to that server on a different interface that is in a different subnet/vlan over IPv4.

I have done a pcap and source and destination ethernet looks good, just see no response

I am not sure where to go from here, everything seems like it should work, but it doesn't.

So to sum up, trying to connect to server one (VLAN 2, ip 192.168.2.x) from workstation one (vlan 3 ip 192.168.3.x) doesn't work, but connecting to server 2 (vlan2 ip 192.168.2.y) does work. Connecting to server one on ipv6 from workstation one does work. Connecting to server one from server two does work. Connecting to Server one on interface 2 (vlan4, ip 10.0.0.x) works. Traceroute stops at gateway.
Any help?

[bartjsmit]

Add logging to the firewall rule that allows the access and check if it gets used?

Bart...