Redirected to localhost after login

[MegaHertz]

After upgrading to 3.6.0 anytime users try to login to the fourm, they get redirected to: http://127.0.0.1:8002/forum/index.php

If we try to login to the admin or mod control panels we get the same redirect. If we replace the 127.0.0.1:8002 with www.outpostfirewall.com we are able to get logged in. This same issue also occured after we put in place the cross site scripting security fix.

I suspect this maybe a webserver issue, but wanted to check here first. As always your help is greatly appreciated.

[Jake Bunce]

The login form should not change the current host. Try to reproduce this problem on the default style with no plugins or file hacks.

[MegaHertz]

Jake, here is the respomse from our webserver admin.

I've found that the problem was in VBulletin use of HTTP_HOST server
variable, which is set to the local address of backend server in our
setup. To fix this, I've put an appropriate line of php code to
config.php.

Here is what he had to add to the config.php in order to resolve the redirect issue.

// to avoid redirecting issue, temporarily setting HTTP_HOST to SERVER_NAME
$_SERVER['HTTP_HOST'] = $_SERVER['SERVER_NAME']; 

FYI I did disable the plugins system at one point and it did not resolve the redirect issue.