Logging inbound traffic blocked by firewall shows the following line which repeats 4 times.
Aug 24 22:57:46 FTP4 user.warn kernel: DROP IN=vlan2 OUT= MAC=e0:cb:4e:ad:f0:20:28:16:2e:69:39:d1:08:00:45:00:00:3c SRC=188.8.131.52 DST=192.168.1.1 LEN=60 TOS=0x00 PREC=0x00 TTL=48 ID=19063 DF PROTO=TCP SPT=13771 DPT=21 WINDOW=14600 RES=0x00 SYN URGP=0 OPT (020405B40402080A0013056B0000000001030306)
If inbound logging blocked by firewall is turned off nothing shows up. The FTP server used to work when behind a DSL modem. It is now behind a Uverse gateway with the RT-N16 in DMZ+ mode. Setting DMZ mode in port forwarding on the router seems to have no effect. What may have I missed in setting this up correctly?