Hi to everybody, I had a strange problem.
I set my new RB with a LAN access with DHCP for my office network, then other config for the rest of the network.
All works fine, I can read mail, use internet and all the services except that with the office computers I cannot connect to DUDE! I cannot connect to the clients CPE.
I had configured my lan address on the Ethernet ports 11 and 12, the switch is on 0.
For now I use an RB750 with similar configuration and it works!!
Any idea?
Thank you.

Do you use routing marks in RB1100AH?
Did you try to ping or traceroute the dude server? Maybe it's a routing problem