Can I forbid an IP to access my forum
 

Hello
There's a bot has an IP from Chain.
Everyday he registers a new account, activates his account and posts ads replies, even though I'm using reCAPTCHA system.
So I want to forbid this IP to access my forum.
Can I do that?

Thanks

yes

If so, please tell me how I can do it?

Go to your Admin Panel > Vbulletin Options > User Banning Options

there you will be able to list your banned IP's, If you want to ban one ip place the whole number there, if you want to ban an entire range then just use the first 3 number followed by a dot like this

213.

Good luck :D

You can also ban an ip via htaccess or iptables. It really depends on how much access you have to your server.

Thanks very much guys and happy new year

yep