Proxy 502 error: The request was rejected by the HTTP filter. (12217) I found that the PC in question did not have the firewall client installed. Installing it resolves the issue but I don't understand why. How does the firewall client change the http filter result? 36536 0 818 5158 0x80074e20 0x0 0x0 Firewall 2/1/2006 14:37:14 61.135.151.203 80 HTTP Closed Connection 64.25.1.10 Local Host External - - 0.0.0.0 Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR 2.0.50727) Yes Proxy Server www.staples.com TCP Internet - - - Blocked by the HTTP security filter: the response content is encoded and cannot be scanned - - - 0 94 4345 806 12217 The request was rejected by the HTTP filter. Contact your ISA Server administrator. 0x3040000 0x480 Web Proxy Filter 2/1/2006 14:37:14 72.246.126.125 80 http Denied Connection SBS Internet Access Rule 172.18.0.143 Domain\username Internal External GET http://www.staples.com/webapp/wcs/stores/servlet/home?storeId=10001&lang Id=-1&krypto=mfxq1nTSMWh0shUQOLdqekZxx8aozrkWIFqse0LeL0zGl%2FNNJmka%2F2N a9ddBYs0O 64.25.1.10 DSASBS02 - TCP - - 36537 0 689 971 0x80074e20 0x0 0x0 Firewall 2/1/2006 14:37:14 72.246.126.125 80 HTTP Closed Thanks, Amy Harbor Computer Services Small Business Computer Specialists Client Blog: http://smalltechnotes.blogspot.com/ Tech Blog: http://isainsbs.blogspot.com/ Website: http://www.harborcomputerservices.net/