Interoperating transactionally between application servers

This topic describes some considerations and actions that you can take to interoperate transactionally between different types of application servers.

WebSphere Application Server is a transaction manager that supports transactional interoperation with other transaction managers through either the CORBA Object Transaction Service (OTS) protocol (for example, application servers) or, for JSR-109 compliant requests, Web Service Atomic Transaction (WS-AtomicTransaction) protocol . This is in addition to its ability to coordinate XA resource managers and to be coordinated by J2EE Connector 1.5 resource adapters.

To interoperate transactionally, using the OTS protocol, between WebSphere Application Server Version 6 and versions of the WebSphere Application Server before Version 5.0, you need to set the following system properties on application servers that are before Version 5.0:
```
com.ibm.ejs.jts.jts.ControlSet.nativeOnly=false  com.ibm.ejs.jts.jts.ControlSet.interoperabilityOnly=true
```
For example, if you want to interoperate between application servers at WebSphere Application Server Version 6 and WebSphere Application Server Version 4.0.n, you need to set the system properties on the Version 4.0.n application servers.
If you have enabled WebSphere Application Server global security, you need to disable protocol security on servers at version 6.0.2 or later to be able to interoperate transactionally with servers at earlier versions.
To disable protocol security on a server, complete the following steps:
1. Under Additional Properties select Custom Properties.
2. On the Custom Properties page, click New .
3. On the settings page, type DISABLE_PROTOCOL_SECURITY in the Name field and TRUE in the Value field.
4. Click Apply or OK.
5. Save your changes to the master configuration.
6. Restart the server.