Now with another customer, I spend again a whole day on nscd which will not keep on running. In debugging mode the error is: "nscd: cache.c:144: cache_add: Assertion `newp->key + newp->len <= table->head->first_free' failed." Removing the databases in /var/db/nscd/ resolved the problem. The database locations are not documented, nor is there any other usefull documentation on nscd.