Backups failing with EC811

 Server access denied

csprd130g.sldc.sbc.com is not a media server either

A couple of lines above this you will see this error as well, right?

csprd130g.sldc.sbc.com is not a master server 

You are missing

SERVER = csprd130g.sldc.sbc.com 

in the first line of bp.conf on the Media/client

If you decide to work with FQDN, you need to use it everywhere - in hosts files, in bp.conf, etc.
csprd130g.sldc.sbc.com != csprd130g or any other variation of hostnames.
 

dbclient tells us that the master does not recognize the client as a server:

server exited with status 37: operation requested by an invalid server

Check bp.conf and /etc/hosts entries on the master server.
NBU daemons need to be restarted on the master when SERVER or MEDIA_SERVER entries are added to bp.conf.

Verify hostname lookup between master as media server:

On master:
bpclntcmd -hn cipk104-ebr.sldc.sbc.com
bpclntcmd -ip <media-IP>

On Media/client:
bpclntcmd -self
bpclntcmd -hn csprd130.sldc.sbc.com
bpclntcmd -ip <master-IP>
bpclntcmd -pn

Herewith my own experience with status 811:

https://www-secure.symantec.com/connect/forums/811-error-new-media-server#comment-5590721

https://www-secure.symantec.com/connect/forums/netbackup-655-media-server-problems#comment-3702681