502.3 - Bad Gateway security error code

Problem Statement:

Whenever you are using IIS ARR with URL Rewrite for Reverse proxy. 
HTTPS to HTTPS. You might receive following error.

Error: IIS 7.5 Detailed Error - 502.3 - Bad Gateway security error code 0x80072f8f

Casue of Problem:

IIS where you configured ARR it doesn't trust the BackEnd IIS Server certificate.

Solution:

Please export the Back End IIS Server certificate and Import it into IIS-ARR local machine under
Trusted Store.

Reference: http://blog.lint.at/iis-as-reverseproxy-with-ssl-offloading/

System.Configuration The entry 'XXX has already been added (C:\Program Files (x86)\Microsoft BizTalk Server 2010\BTSNTSvc64.exe.Config)

Problem Statement:
Sometimes if we get following kind of error message:

Error writing to log. System.Configuration The entry 'XXXX' has already been added. (C:\Program Files (x86)\Microsoft BizTalk Server 2010\BTSNTSvc64.exe.Config line 156)


Cause of Error:

This is the result of a double entry in the config files BTSNTSvc.exe.Config or BTSNTSvc64.exe.Config and machine.config

Solution:

Option 1:

Search machine.config and BTSNTSvc.exe.Config ( or BTSNTSvc64.exe.Config) and remove double entry.


Option 2:

In BTSNTSvc.exe.Config ( or BTSNTSvc64.exe.Config) replace below lines of code.

      <add name="XXXX" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

        filePath="D:\AAAA\Config\BBBB.config" />

with


<remove name="XXXX"/>
 <add name="XXXX" type="Microsoft.Practices.EnterpriseLibrary.Common.Configuration.FileConfigurationSource, Microsoft.Practices.EnterpriseLibrary.Common, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"

        filePath="D:\AAAA\Config\BBBB.config" />

Then it will work :-)

Regards

Kundan