dataprotector 9 push installation from installation server to linux client does not work

I have a CentOS installation server and try to deploy the disk agent of DP9.09 to other linux hosts.
I can ssh as root to the client through public key authentication but if I use ob2install I do not even see a trace of a connection in the client logs.

My installation command is:

/opt/omni/sbin/ob2install -server $(hostname -f) -input obinstall.txt

which I run on the installation server, thus hostname -f expands to the FQDN of the IS.

I tried various ob2install options as listed here:

cat obinstall.txt
        -host "lxclient.mycompany.com" -da "A.09.09" -push_inst "-" "-" "-" "-" "-" 2 4
        -host "lxclient.mycompany.com" -da "A.09.09" -push_inst "-" "-" "-" "-" "-" 2 1
        -host "lxclient.mycompany.com" -da "A.09.09" -push_inst "-" "-" "-" "-" "cellSvr" 2 1
        -host "lxclient.mycompany.com" -da "A.09.09" -push_inst "-" "-" "-" "-" "cellSvr.mycompany.com" 2 1

but all of them failed.
This is the error output

Sending installation data to binary master on instSvr.mycompany.com
********************** DEFAULT ERROR REPORT *********************************
15 [12:1] [2002] 1492511067 OB2INSTALL instSvr.mycompany.com - : unknown cell server *****************************************************************************

********************** DEFAULT ERROR REPORT *********************************
15 [12:1] [2002] 1492511072 OB2INSTALL instSvr.mycompany.com - : unknown cell server *****************************************************************************

********************** DEFAULT ERROR REPORT *********************************
15 [12:1] [2002] 1492511072 OB2INSTALL instSvr.mycompany.com      You have no permission to install client lxclient.mycompany.com -da A.09.09 in cell cellSvr.mycompany.com! *****************************************************************************

********************** DEFAULT ERROR REPORT *********************************
15 [12:1] [2002] 1492511072 OB2INSTALL instSvr.mycompany.com      You have no permission to install client lxclient.mycompany.com -da A.09.09 in cell cellSvr.mycompany.com! *****************************************************************************
        Aborting. *****************************************************************************

I do not see any ssh connection attempts of ob2install which irritates me as a normal ssh session shows up well in the system log.
How can I troubleshoot the problem?