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Error Code: 502 Proxy Error. The host was not found.(11001)

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Error Code: 502 Proxy Error. The host was not found.(11... - 16.Aug.2011 3:50:39 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
Hello,

We have ISA 2004 with SP3 now. When the problem started we had SP2 and we installed the KB916106 update installed that was supposed to fix this problem.

The symptoms are as follows:

We have a website that is accessible on HTTP but when there are certain options selected and the same website (www.subdomain.domain) changes the connection from HTTP to HTTPS than we receive the following error:

Network Access Message: The page cannot be displayed
Technical Information (for Support personnel)
    Error Code: 502 Proxy Error. The host was not found.(11001) IP Address: X.X.X.X
    Date: 8/16/2011 7:03:24 AM Server: proxy01 Source: proxy

The IP is the one form this ISA machine.
The date is exactly 3h behind the date on this ISA machine.
The Server (proxy01) is the name of this ISA machine.

The website request flow is being redirected to another ISA server through Web Chaining .

From a machine that is bypassing the first ISA and goes directly to the second one the website is working just fine.

Both the http and the https url's were added in the web-chaining (just in case).

The website is a fairly important one and the problem can not be ignored simply because the problem exists only for this one.

Can you please help us with this problem and suggest/provide a solution.

Thank you!
Post #: 1
RE: Error Code: 502 Proxy Error. The host was not found... - 17.Aug.2011 8:25:11 PM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

how about if you remove the web chaining?

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to berbondac)
Post #: 2
RE: Error Code: 502 Proxy Error. The host was not found... - 18.Aug.2011 3:14:11 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
I do not think this is an option.

Without redirecting to this second proxy there is no way of getting out to the internet, and thus no outside websites are accessible without web chaining.

Also removing this proxy altogether is not an option due to the internet access flow design.

Thank you!

(in reply to paulo.oliveira)
Post #: 3
RE: Error Code: 502 Proxy Error. The host was not found... - 18.Aug.2011 5:01:01 AM   
romvdmeulen

 

Posts: 105
Joined: 5.Aug.2011
Status: offline
If your downstream proxy can route to your upstream, removing the chain should work.

What does your chain look like? (show us your config)

(in reply to berbondac)
Post #: 4
RE: Error Code: 502 Proxy Error. The host was not found... - 18.Aug.2011 11:23:38 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

this is only for test purposes. Not a permanent solution.

You may validate on both servers without the chaining.

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to berbondac)
Post #: 5
RE: Error Code: 502 Proxy Error. The host was not found... - 19.Aug.2011 4:48:01 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
Hello,

I am pasting here the config for the web-chaining:








As for the routing to the upstream server am not sure what do you mean... If the default gateway is through that upstream server or what exactly?

Thank you!

(in reply to paulo.oliveira)
Post #: 6
RE: Error Code: 502 Proxy Error. The host was not found... - 19.Aug.2011 4:51:28 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
Hmmmm...

It does not save the images i am placing here...

Any suggestions on an alternative way to provide you with the config for the web-chaining?

(in reply to berbondac)
Post #: 7
RE: Error Code: 502 Proxy Error. The host was not found... - 19.Aug.2011 10:45:17 AM   
paulo.oliveira

 

Posts: 3472
Joined: 3.Jan.2008
From: Amazon, Brazil
Status: offline
Hi,

what I meant is to place the client behind ISA firewall only and this ISA firewall is directly connected to the internet.

This way you can be sure if is something related to ISA or not.

About uploading pictures, it is no possible, you must host anywhere else and copy the link here.

Regards,
Paulo Oliveira.

_____________________________

Microsoft Premier Field Engineer (PFE)
Blog: http://poliveirasilva.wordpress.com/
Twitter: https://twitter.com/poliveirasilva

(in reply to berbondac)
Post #: 8
RE: Error Code: 502 Proxy Error. The host was not found... - 21.Aug.2011 9:10:23 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
This can not be done as the clients that have this problem can not be placed behind the second proxy, nor the first prxy can be placed directly in the internet.

Thank you!

(in reply to paulo.oliveira)
Post #: 9
RE: Error Code: 502 Proxy Error. The host was not found... - 29.Aug.2011 4:16:10 AM   
berbondac

 

Posts: 6
Joined: 16.Aug.2011
Status: offline
Hello,

Any thoughts?

(in reply to berbondac)
Post #: 10

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