Thanks for the help!
Here is the debug log, does it give any further hints what to try next:
FG80CM3909605232 # id=36871 trace_id=1 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=1 msg=" allocate a new session-00002ac2"
id=36871 trace_id=1 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=2 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=2 msg=" allocate a new session-00002ac3"
id=36871 trace_id=2 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=2 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=3 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=3 msg=" allocate a new session-00002ac4"
id=36871 trace_id=3 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=3 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=4 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=4 msg=" allocate a new session-00002ac6"
id=36871 trace_id=4 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=5 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=5 msg=" allocate a new session-00002ac7"
id=36871 trace_id=5 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=5 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=6 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=6 msg=" allocate a new session-00002ac8"
id=36871 trace_id=6 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=6 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=7 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=7 msg=" allocate a new session-00002aca"
id=36871 trace_id=7 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=8 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=8 msg=" allocate a new session-00002acb"
id=36871 trace_id=8 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=8 msg=" iprope_in_check() check failed, drop"
id=36871 trace_id=9 msg=" vd-root received a packet(proto=17, 192.168.1.111:137->192.168.1.255:137) from internal."
id=36871 trace_id=9 msg=" allocate a new session-00002acc"
id=36871 trace_id=9 msg=" find a route: gw-192.168.1.255 via root"
id=36871 trace_id=9 msg=" iprope_in_check() check failed, drop"
Thanks
liam3w