Unable to logon MSDAX while client opening SSRS Report

Problem

In AX 2012 , Error : "Unable to logon Microsoft dynamics ax" while clients opening SSRS reports.

Solution Hints:

your reporting server config needs to be checked properly. choose the default report server DB from configuration and check the logon criteria there. also you need to check correct report server config from AX admin module.

Validate the settings on reporting services configuration manager.
check the domain user has proper user groups in active directory also in AX system user roles should be assigned