BizTalk Host instance fails to start after a configuration file change

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This article explains that after you change the configuration file in BizTalk Server, a failure might occur and the BizTalk Server host instance can't start.

Original product version:   BizTalk Server 2009
Original KB number:   2411668

Symptoms

The BizTalk Server host instance can't start after you changed the configuration file in BizTalk Server. You might get the following error:

A failure occurred when executing a Windows service request.
Service request: Start
BizTalk host name: BizTalkServerApplication
Windows service name: BTSSvc$BizTalkServerApplication
Additional error information:
Error code: 0xc0c0153a
Error source: BizTalk Server 2009
Error description: A BizTalk subservice has failed while executing a service request.
Subservice: Tracking
Service request: Start
Additional error information:
Error code: 0x80131534
Error source: System.Data
Error description: The type initializer for 'System.Data.SqlClient.SqlConnection' threw an exception. For more information, see Help and Support Center at Microsoft Support.

Cause

The btsntsvc.exe.config or btsntsvc64.exe.config file had been modified with an xlangs section. No configuration section handler was present for xlangs.

Resolution

Add a configuration section handler for xlangs.

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="xlangs" type="Microsoft.XLANGs.BizTalk.CrossProcess.XmlSerializationConfigurationSectionHandler, Microsoft.XLANGs.BizTalk.CrossProcess">
    </section>
  </configSections>