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Proxy Chaining - 17.Dec.2004 4:41:00 PM

falzati

Posts: 3
Joined: 16.Dec.2004
Status: offline

Hello,
I've installed on a server Windows 2003 ISA 2004 Std. but I've some problem
using the Web Chaining feature: previously in this server I've installed ISA
2000 and TrendMicro Interscan VirusWall SMB 5.0. I've configured ISA 2000
(listening on port 8080) to forward the HTTP request to the TrendMicro
service (listening on port 8081) that was the upstream server configured in
the routing policy and all works fine.
After I've upgraded ISA form 2000 to 2004 version, also importing the
previously configuration or recreating all rules (firewall policy with http
policy without restriction, and web chaining policy) I receive the following
error message:
"Error Code: 502 Proxy Error. The parameter is incorrect. (87) ".
Please suggest me how can I solve this problem
Thanks in advance for any help
-F

Post #: 1

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RE: Proxy Chaining - 17.Dec.2004 4:42:00 PM

falzati

Posts: 3
Joined: 16.Dec.2004
Status: offline

Hi all,

we discover that this problem appear only if the Trend Micro and ISA 2004
are on the same server. If these services are splitted on different service
che Web Chaining rule mentioned below work correctly.
Now the problem is that the ISA 2004 firewall service drop the communication
(or probably enter in a strange loop) from the ISA 2004 web proxy and the
TrendMicro HTTP Proxy when both are on the same machine.
We have tested also that if we enable the web chaining rule and in the
browser configuration we set directly the TrendMicro HTTP Proxy (bypassing
the ISA 2004 web proxy) the error mentioned below appears again.
The same thing happens if on the ISA 2004 we don't set any proxy in the
browser configuration and we try to connect to an internet site. ISA 2004
intercept this communication and redirect all packet on the host:port
configured in the web chaining rule.
Now the question is: It's possible to bypass this problem ?

Thanks for all suggestion

-- F

(in reply to falzati)

Post #: 2

RE: Proxy Chaining - 2.Feb.2005 11:14:00 PM

maho

Posts: 1
Joined: 2.Feb.2005
Status: offline

hi falzati,

I have the same problem too. I want configure web chaining, that ISA 2004 Server is listen to Port 8080 and redirect HTTP request�s from Clients to self to Port 8081 to Trendmicro IWSS.

Do you found a workaround? Can you or anyone help me PLEASE?

thanks for all suggestion

(in reply to falzati)

Post #: 3

RE: Proxy Chaining - 17.Nov.2005 11:11:45 PM

phillipm

Posts: 23
Joined: 7.Jun.2004
From: Wellington, New Zealand
Status: offline

Hi Guys

i have the same problem .. here is my setup

Windows 2003 Std SP1
ISA 2004 + SP1
Trendmicro IWSS 2.5

LAN Client -> ISA Port 8080 -> IWSS 2.5 8081 -> Internet

i am getting routing chaining errors .. when isa is passing to IWSS .. Web Proxy filter is turned off ..

any help would be greatly appreciated ..

(in reply to maho)

Post #: 4

RE: Proxy Chaining - 21.Dec.2005 9:16:58 PM