Hi guys I'm having an issue at a client site. Managed to migrate from ISA 2000 to ISA 2004 successfully bar one issue. They run Merak mail server. Everything works as it should apart from downloading attachments from the webmail part of it.. The error code returned by IE is Error Code: 500 Internal Server Error. The request is not supported. (50) Snippet from the corresponding log entry below. Original Client IP Client Agent Authenticated Client Service Server Name Referring Server Destination Host Name Transport MIME Type Object Source Source Proxy Destination Proxy Bidirectional Client Host Name Filter Information Network Interface Raw IP Header Raw Payload Source Port Processing Time Bytes Sent Bytes Received Result Code HTTP Status Code Cache Information Error Information Log Record Type Log Time Client IP Destination IP Destination Port Protocol Client Username Action Rule Source Network Destination Network HTTP Method URL 0.0.0.0 Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322) No Reverse Proxy CROMWELL mail.megawatts.bm TCP Internet - - - - - - 0 30 2127 747 50 0x3000010 0x400 Web Proxy Filter 4/11/2005 8:26:31 PM 65.200.172.140 192.168.109.109 80 http anonymous Failed Connection Attempt WWW WebMail External GET http://192.168.109.109/mail/attachment.html/Redneck%20911.doc?id=7c114eb 51192585aa524215e6b2407f1&messageid=20050411193415438E-00000002.tmp&inde x=5&folder=inbox Has anyone got any ideas?? There were no issues with isa 2000 S ____________________________________________ Steve Moffat President & CEO Optimum I.T. Solutions Ltd <http://www.optimum.bm/> Tel: (441) 232 8849 Helpdesk: (441) 232 8849 Email : steve@xxxxxxxxxx <mailto: steve@xxxxxxxxxx> http://optimum.bm <http://www.optimum.bm/> The haggis is unusual in that it is neither consistently nocturnal nor diurnal, but instead is active at dawn and dusk (crepuscular), with occasional forays forth during the day and night.