Backup Exec 2010 R3 - SP4

Hi all,

Full scenario:

1. START
   • Old physical HP Proliant ML 350 G5
   • Tape robot
   • Server 2008 std
   • job setup:
     • Monday: Full backup of all servers, excluding the physical HP ML 350 G5
     • Monday: chained behind the full backup, using a post command, another full job starts, backing up to HP ML 350 G5
     • Tuesday: same 2 jobs, differential
     • Wednesday: same 2 jobs, full
     • Thursday: same 2 jobs, differential
     • Friday: same 2 jobs, full

We did a P2V since the hardware was outdated.
Everything remained the same, IP, name, the lot.
Offcourse we uninstalled Backup Exec since we'd need a physical machine to use the tape robot.

2. CURRENT SETUP, for backup:
   • Temporary HP Proliant ML 350 G6
   • Tape robot
   • Server 2012 std
   • Backup exec 2010 R3 - SP 4 + hotfix 212812

What we did was

• install BE 2010 R3 - SP4 + hotfix 212812
• just copy the right files and folders, from the old G5, to the newer G6
• all the jobs etc. were there, looking good
• created a small test job, few mb: success (amazing)
• First night we ran a real backup: failed: no trust relationship
• Uninstalled remote agents, applied hotfix 212812, reinstalled remote agents
• Trying to get the backup right now, since october 6th.. without success.

For some reason the notifications aren't sent out anymore, the jobs won't chain anymore like they used to, sometimes they do, sometimes they don't..

Main issue, or worst error is, no backup at all..

Error:

"Woensdag - Excluding ABNSQL01 -- The job failed with the following error: The network connection to the Backup Exec Remote Agent has been lost. Check for network errors."

Job log:
Job ended: donderdag 9 oktober 2014 at 9:53:42

Completed status: Failed
Final error: 0xe00084f8 - The network connection to the Backup Exec Remote Agent has been lost. Check for network errors.
Final error category: Resource Errors

For additional information regarding this error refer to link V-79-57344-34040

I have no more ideas left...
The error makes no sense at all, there is no loss of connectivity..
What to do?

Thanks in advance

Note: we did not copy over the catalogs to the ML G6 server, just the config files etc..
Note2: all remote agents are on the same version as the backup exec server + also disabled symantec endpoint protection on the backup exec server, read somewhere this might also cause this issue...