I can't connect to ISA Server proxy

Hello,
I have Nokia E70 and I can't connect to the Internet at my work place since they run the ISA Server 2006 as a proxy. The thing is, I can't find where should I supply my Domain username and password.
After the phone connects to the Wireless, it doesn't complete to open the page and give me an error message "Unable to complete operation"
So could you please tell me what should I do?

m8s,
An IT dept. that does not provide support! What ever the reason most likely they don't want to slow downs the whole network. An ISA admin knows(should)  this.Heres a sample of one IT dept in a university suggest to one with E51.
E51  a sample settings for ISA server connection (it could different according what security being implemented) * WLAN security mode: 802.1X
* WLAN Security settings:
* WPA/WPA2: EAP
* EAP plug-in settings:
* EAP-PEAP (Only this one is selected).
* Personal ceritificate: Not Defined
* Authority certificate: Certificate of your ISA Server
* User name in use: User defined
* User name: Your User Name (Can be eventualy: Your Domain\Your User Name
* Realm in use: User defined
* Realm: Empty
* Allow PEAPv0: Yes
* Allow PEAPv0: No
* Allow PEAPv0: No
* EAP-MSCHAPV2 (Only this one is selected).
* User name: Your User Name
* Prompt password: No
* Password: Your Password
Note that you *have to* install the certificate of your Radius Server on your phone (ie: it is not trusted if you leave it blank).
Knowledge not shared is knowledge wasted!
If you find it helpfull, it's not hard to click the STAR..

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