Re: SSL Bridging Fun

SSL Bridging FunISA is resolving the web server name to its own external IP 
address (thus the proxy chain loop msg).
As stated in the article, you'll need to help ISA resolve the name to the 
proper internal IP using either a hosts file entry or a 'spoof' DNS entry.
This is another argument for a split DNS structure.
You aren't using the same internal domain name as you use externally, are you?

Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/authors/harrison/
Read the books!

  ----- Original Message ----- 
  From: Tony Lou 
  To: [ISAserver.org Discussion List] 
  Sent: Sunday, July 14, 2002 11:52 PM
  Subject: [isalist] SSL Bridging Fun


  http://www.ISAserver.org


  Hi all, 

  Having an issue with SSL bridging which is driving me spare. Would appreciate 
some assistance from any who have come out winners in this area.

  We have a Web server (W2K, IIS) running on our internal network. 
  Published through ISA on standard ports (ie, HTTP - 80, SSL - 443) 
  A Verisign Certificate installed on both IIS and ISA. 

  I have worked through this document; 
  (http://www.isaserver.org/pages/articles.asp?art=157) to the letter. 

  The problem seems to relate to this line in the document; 

  9.15 "On the Rule Action window select "Redirect the request to this internal 
Web server" 
  9.16 "Make sure you enter the name of the internal web site being published 
(not the IP address or internal server name). This is the same as the 
certificate.

  NOTE: Make sure the ISA server can resolve this name to the internal Web 
servers IP address.The external DNS servers will resolve the published Web site 
name to the external IP address of the ISA server but the ISA server needs to 
resolve the name to the internal published Web server. You may have to create a 
HOST file locally on the ISA server to resolve the name to the internal Web 
server IP address"

  If I enter the "Web Site name" I get this error generated by the ISA Server; 

  "The server has detected a proxy chain loop. This condition 
  might indicate a configuration problem in proxy server". 

  If I don't, and instead enter the internal IP address, all works fine except 
that SSL doesn't bridge and I get this error instead;

  "500 Internal Server Error - The target principal name is incorrect. 
(-2146893022) 
  Internet Security and Acceleration Server" 

  Would deeply appreciate any assistance. 

  Thanks in Advance, 

  Tony Lou 

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