[ubuntu-uk] ntlmaps and ISA server.

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Hi,

I have put ntlmaps on one of my work machines (Ubuntu 10.04) in order to 
authenticate to the work ISA proxy server. Synaptic, apt-get, etc all work fine, 
and many websites also work. There are however some web sites that will not 
display at all (e.g. ubuntu.online02.com) and Firefox says it is waiting for the 
website, some sites that display most of the page but never seem to complete 
(www.bbc.co.uk) and on yahoo.co.uk, the site says it cannot display as the 
browser (Firefox) is not recognised and I should install Firefox.

I also have a work Windows XP machine, alongside the Ubuntu one, which is 
connected to the same network segment on the same network switch and which runs 
Firefox without any of the problems detailed above. I have spent a couple of 
days Googling without much success. Anyone have any ideas?

Thanks

John