Attachments in CA Service Desk Manager (CA SDM) stop working after enabling the NX_NOFASTCHAN option in the NX.ENV

Document ID : KB000028800
Last Modified Date : 14/02/2018
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Within the CA SDM NX.ENV file, there is an option called:


In the desirable configuration, typically this option is left disabled to allow CA SDM communication through Fast Channel, which performs better than sending all communication through Slump (Enabling Fast Channel forces SDM to communicate only through one port, which causes serious performance issues. For more information on Fast Channel performance please review TEC602295)

Under certain circumstances it may be required to enable the NX_NOFASTCHAN=1 option to avoid a connectivity issue that cannot be easily resolved.  After adjusting the option from:




attachments may stop working. The users may not see an error message aside from a general timeout and the CA SDM STDLOG log files may not provide any clear errors.


If the Fast Channel connection has been disabled in the NX.ENV, it must also be disabled in the Tomcat WEB.XML located at:


Edit the Web.xml file in a text editor and find the section:

<!-- set param to YES to enable fast channel to the repository daemon    -->       

<param-name>fast_channel</param-name> <param-value>YES</param-value>  </context-param>

Change the setting to:

<!-- set param to YES to enable fast channel to the repository daemon    -->       

<param-name>fast_channel</param-name> <param-value>NO</param-value>  </context-param>

Then restart the CA SDM Tomcat or restart the entire CA SDM service.