Only single user not able to access COgnos Connection

[coghelp]

One of my user (only one user) is not able to access Cognos Connection, he is seeing the error CAM-AAA-0134. We have security by using AD Groups to Cognos Connection, I can see he is in that  AD group members and I also see that his profile is created in Cognos Admin secuity.

Any inputs would help me.

Environment Details - Cognos 8.3, Active Dir (for security), Oracle, AIX.

[sir_jeroen]

What happens if you manually add this AD-user (not AD group) to the Cognos Consumers role?