Arg! I have a very, very weird semi recurring issue...

When I try to log into the back end of a joomla build the router logs an intrusion and thus blocks the incoming traffic, completely cutting me off from the site

I know it's a router issue as I can log into remote pc's and access the page freely. It's happened before and hard resets have worked, but today not only has a reset not fixed the issue but the error now stops email traffic too!

The error is:

Feb 6 21:59:41 (none) user.alert kernel: Intrusion -> IN=ppp_0_38_1 OUT= MAC= SRC=xxx.28.135.81 DST=xx.209.20.79 LEN=48 TOS=0x00 PREC=0x00 TTL=116 ID=18396 DF PROTO=TCP SPT=64595 DPT=64526 WINDOW=8192 RES=0x00 SYN URGP=0

I'm pulling my hair out!! i've tried swapping over to google DNS but no dice...

Help me oh mighty sky forum overlords!

Please...