Hi I hope that maybe someone could help me with my 2820n

I have a server on my network that in accessible by members outside my network.

I have removed one members account but they still try to log in with 3 times a minute causing my server to crash.

I've used FIREWALL/FILTER SETUP/ and added a filter rule to block one specific ip from out side my network getting passed the router so as to never get to my server.

It seem to have worked as I'm not seeing the log in failed on my server but what's confusing me is I can't find these setting with the ip I've think I've banned in my router so if in the future I would like to remove the block on this ip I could.

PS as you probably made out by now I'm no IT supreme.

Any help would be much appreciated.