How to set a custom cookie domain?

[peterbabiy]

He there

Quick question, how would I set up a custom cookie domain? I know I went to mydomain.com/includes/config.php but once I go there I see nothing but a blank page.

Can someone plz walk me through this?

Also I tried uploading the tool.php file but nothing on the admincp is there other than reseting the cookie

Thanks

[Wayne Luke]

Unless you are running multiple vBulletins on the same domain, you shouldn't change this. It will only cause you grief in the long run.

[peterbabiy]

Im sorry wat exactly do u mean? I installed vbSEO on my site and it would always log me out as soon as I log in so the guy from vbSEO said I should change it to .forum.mydomain.com and when I did that all went normal.

Is it bad?