Unable to log into the Enforce console with a specific account after upgrade

Products

• Data Loss Prevention Enforce

Issue/Introduction

• After successfully upgrading your DLP solution to a 15.x version you are unable to log into the Enforce console
• The login problem is restricted to a specific account or domain - with other accounts the login works normally

Enforce Console Error: 
The page isn't redirecting properly

localhost log error:
SEVERE [com.vontu.manager.spring.web.ManagerHandlerExceptionResolver] Unexpected exception while processing request:
Cause:
java.lang.NullPointerExceptionjava.lang.NullPointerException
    at java.util.Collections$UnmodifiableMap.<init>(Collections.java:1446)
    at java.util.Collections.unmodifiableMap(Collections.java:1433)
    at com.vontu.manager.ui.statepersistence.UserSessionData.getData(UserSessionData.java:94)
    at com.vontu.manager.spring.web.ContainerCreatingHandlerInterceptor.postHandle(ContainerCreatingHandlerInterceptor.java:77)
    at org.springframework.web.servlet.HandlerExecutionChain.applyPostHandle(HandlerExecutionChain.java:156)

...

Cause

This is a defect that can occasionaly manifest after an upgrade. It will be fixed in 15.5 MP1 and later versions. 

Environment

Upgraded to 15.x 

Resolution

A workaround is available that involves running a short SQL statement against the DLP database and will restore access to the affected user(s).

Please contact support for details, quoting this article number.