Ok, for anyone that cares, You can get this error when Transfer-Encoding: chunk and the chunk size in the data body is bigger then the data returned. -Wayne _____ From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxx] Sent: Thursday, December 23, 2004 2:09 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: Contact your ISA Server administrator. (12216) Hi Wayne, Don't know about ISA 2004, but in ISA 2000 you could edit the registry: [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters] "MaxRequestHeadersSize"=dword:00032000 "MaxResponseHeadersSize"=dword:00032000 HTH, Tom <http://www.isaserver.org/shinder> www.isaserver.org/shinder Tom and Deb Shinder's Configuring ISA Server 2004 <http://tinyurl.com/3xqb7> http://tinyurl.com/3xqb7 MVP -- ISA Firewalls _____ From: Wayne Berry [mailto:wayne@xxxxxxxxxx] Sent: Thursday, December 23, 2004 3:53 PM To: [ISAserver.org Discussion List] Subject: [isalist] Contact your ISA Server administrator. (12216) Anyone know anything about this error: Error Code: 500 Internal Server Error. The size of the response header is too large. Contact your ISA Server administrator. (12216) It appears to happen when using Transfer-Encoding: chunk and the chunk size is very large, however that is not the response header. Response header, appears normal. HTTP/1.1 200 OK Content-Type: text/html Last-Modified: Wed, 22 Dec 2004 16:45:56 GMT Server: GWS/2.1 Cache-Control: private, x-gzip-ok="" Date: Thu, 23 Dec 2004 21:48:44 GMT Transfer-Encoding: chunked b15a. There is nothing in the Microsoft KB, however from doing a google search it appears that I am not the only one with this problem and there are no answer posts. -Wayne