We recently changed our ADSL provider, and we now use the CopperJet 1612 Router modem. Since we started to use this modem, syslog (port 514) is blocked by this modem.
I can see the information sent from the server to our logging server, but in the logs of the mmodem we get :
security:6649.633 Blocked Prot=17, xxx.xx.xx.xxx:514 > xxx.xx.xx.xxx:514 -Disallowed Destination IP
It's only blocking port 514. We also use snmp monitors, port 161, and that isn't a problem at all.
The fire of the modem is disbled, and I'm unable to find any setting to allow connections to and from udp 514.