I'm having trouble logging into any of the free email clients on the web, Yahoo, hotmail and gmail. This is happening in a domain environment w/ a proxy server and iPrism filter. The login page comes up, I enter username and password, hit 'enter' and it comes right back to the login page. It'll keep the username but keeps asking for the password but never logs in. Anyone seen this before, any ideas? I've played w/ all the IE settings to no avail. This environment was locked down extensively by the previous admin (it's a youth corrections secure facility) through GPOs but, again, I can't find any applicable setting. Any help would be greatly apreciated!

So did you, then, previously have admin privleges to the system? It sounds like they've blocked you out.

No, I have complete access and have tried different things under different user accounts. This is a site that my company took over a few months ago and we have all passwords, etc.

If this domain is controlled by GPO and proxy's then you are plum out of luck.
Seems to me that the admin has heavily restricted access and it is them you should be talking to. It doesn't matter what you do on your local machine, you won't get past the restrictions.

Good point! I've just been remoting back to the DC to review settings.

You need to focus your attention on the proxy and filter.
More likely the filter.

Got it, we have a Linksys router that had been recently replaced. Someone set it to 'filter cookies, java applets & activeX'. Deselected the cookies and java, viola!

Thanks!