Hello, I have a couple of software apps that access servers on the internet using the HTTP protocol. These products work well with other proxy products (wingate,sambar) and even unix based products like squid etc, even when proxy authentication is on. The ISA server i have installed uses windows NT authentication (i.e) the username and password combination to access the net is validated against the domain name server. Internet explorer works fine and i can browse ok. When it comes to products like opera, netscape and browsing from linux browsers - and all other third party web access software (download accellerator) i get HTTP/1.1 502 Proxy Error ( The ISA Server denies the specified Uniform Resource Locator (URL). ) And i still get this error even after putting all possible combinations of the user name and password i.e. <username> <domain>\<username> etc. Help! -------------------------------------------------------- BOUNCED CHEQUES? Call Veri-Cheque NOW! on Nairobi 537106 -------------------------------------------------------- AccessKenya - Your Corporate ISP - CRB's solution provider for fast efficient Email and Internet Services --------------------------------------------------------