Redirect loop spotted in previous developers code

[eluser]Gazzhop[/eluser]
I have taken over from a previous developer, and came across some wierd error. Whenever I change his config page - base url from

Code:

http://localhost/sitex/

to:

Code:

http://{internal ip address}/sitex/

I get a redirect loop. When I change it back, everything works fine, but no one else can access the site (as all links and css references have base_url().

Does anybody know what could cause such errors?

I will happily post any code required...