Proxy Redirection Not working

Hi, I am using Zotero 2.1b2 in firefox 3.6.13 in Ubuntu 10.10. I am unable to use the automatic proxy redirection at home. This however works fine at office where I have to use windows. I have tried resetting the proxy settings by unchecking and checking the box. I have also put the string I have seen that firefox uses in my office which is http://%h.ezproxy.lib.ucalgary.ca/%p
However proxy redirection is not working despite these settings while it works beautifully back in office. I am really perplexed as it used to work before but it has stopped.
I would really appreciate any help
regards
Santam

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