Upgrade to MaxDB 7.8 fails due to -4008,Unknown user name/password

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Hello,

I have a strange problem. I try to update a MaxDB 7.7 instance to 7.8.

I start ./DBUPDATE.SH:

INFORMATION : This program upgrades the SAP MaxDB database instance
[...]
Do you want to continue the upgrade [Y] :  Y

Check installation of C++ runtime
...execution 12:08:59
OK

IndepProgPath : /sapdb/programs
IndepDataPath : /sapdb/data

Please enter SAP MaxDB Name    [SID] :  J93
Please enter SAP System Name   [SID] :  J93
Please enter DBM User Name [control] :  control
Please enter DBM User Password       :

INSTROOT        : /sapdb/J93/db
Authorization successful
DB KERNEL       : 64-BIT
DB VERSION      : 7.7.04 Build 28
Database instance version supported
PrivateDataPath : NO

Check availability of SAP users
...execution 12:09:05
SAP System Administrator   : j93adm
SAP Database Administrator : sqdj93
OK

SAP VERSION     : -4008,Unknown user name/password combination

Please confirm the upgrade start [Y] :

Obviously the DBM user and password have been accepted.

Also I created the xuser entry according to SAP note 39439:

xuser -U DEFAULT -u SAPJ93DB,password -d J93 -S SAPR3 -n minbbn30 -t 0 -I 0 set
xuser list
-----------------------------------------------------------------
XUSER Entry  1
--------------
Key           :DEFAULT
Username      :SAPJ93DB
UsernameUCS2  :S.A.P.J.9.3.D.B. . . . . . . . . . . . . . . . . . . . . . . . .
Password      :?????????
PasswordUCS2  :?????????
Long Password :?????????
Dbname        :J93
Nodename      :minbbn30
Sqlmode       :SAPR3
Cachelimit    :-1
Timeout       :0
Isolation     :0
Charset       :<unspecified>
-----------------------------------------------------------------

I can successfully connect to the database with SAPJ93DB:

dbmcli -u control,password -d J93 sql_connect SAPJ93DB,password
OK

So why can't I simply upgrade this MaxDB instance? Is there any logfile of DBUPDATE.SH with more information available?

Regards,

Mark