After you promote ops center, is it on bp.conf?
On opscenter, data collection tab, agent is checked? please uncheck.
After this restart nbsl service on master.
Regards
Guilherme
Error 59 is name resolution.
Try Nslookup, ping.
After that, send bpgetconfig -M client_name
If you have master and medias, verify if they show on line SERVER=