2691045 - NWA 500 Internal Server Error Failed to retrieve client for current request

When accessing NWA or other Web Dynpro applications on your system you are getting an internal server error.

Checking the default trace file for the log id you will see the following exception:

Cannot process an HTTP request to servlet [dispatcher] in [webdynpro/resources/sap.com/tc~lm~itsam~ui~mainframe~wd] web application.
[EXCEPTION]
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to retrieve client for current request. Causing exception is nested.
at com.sap.tc.webdynpro.clientserver.task.Task.getClient(Task.java:457)
...
...
...

Caused by: com.sap.tc.webdynpro.services.cal.core.exceptions.WDClientException: Found no client: clientNameReqParam=null, clientNameAppParam=null, useragent=Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko

And/OR

500 Internal Server Error is returned for HTTP request [http://<HOST>:<>PORT/webdynpro/resources/sap.com/tc~lm~itsam~ui~mainframe~wd/FloorPlanApp]:
component [dispatcher],
web module [webdynpro/resources/sap.com/tc~lm~itsam~ui~mainframe~wd],
application [sap.com/tc~lm~itsam~ui~mainframe~wd],
DC name [sap.com/tc~lm~itsam~ui~mainframe~wd],
CSN component[BC-NWA-INC-UIF],
problem categorization [com.sap.ASJ.web.000137],
internal categorization [545162065].

[EXCEPTION]
com.sap.tc.webdynpro.services.exceptions.WDRuntimeException: Failed to retrieve client for current request. Causing exception is nested.

SAP Netweaver 7.3

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