There are a couple of things that could be wrong. First, for a domain user DB2 tries to list the user's groups in the domain by default. To override this behaviour set the registry variable:
db2set -g DB2_GRP_LOOKUP=local
Second, for DB2 to be able to authenticate the user, the account under which it is running (the one that the DB2 service uses to log in) should be allowed to access AD.
"Second, for DB2 to be able to authenticate the user, the account under which it is running (the one that the DB2 service uses to log in) should be allowed to access AD"
I fixed the problem by using my ad account ad\u123 to start the db2 service.
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