Hi Leslie,
Thank you for your help I manage to resuscitate one of the VDP and access it via the vCenter (but I cannot still access them via the web admin: 8543/vdp-configure/).
On the machine that still not working when I run the /usr/local/avamarclient/etc/registervcenter.sh I get allot of:
Identity added: /home/dpn/.ssh/dpnid (/home/dpn/.ssh/dpnid)
dpnctl: INFO: MCS status: down.
dpnctl: INFO: [see log file "/usr/local/avamar/var/log/dpnctl.log"]
.... Waiting for MCS to start - Fri Apr 17 08:41:56 BST 2015
Identity added: /home/dpn/.ssh/dpnid (/home/dpn/.ssh/dpnid)
dpnctl: INFO: MCS status: down.
dpnctl: INFO: [see log file "/usr/local/avamar/var/log/dpnctl.log"]
.... Waiting for MCS to start - Fri Apr 17 08:42:04 BST 2015
Identity added: /home/dpn/.ssh/dpnid (/home/dpn/.ssh/dpnid)
dpnctl: INFO: MCS status: down.
But it does not eventually ask me to enter the credential to connect to the vCenter like the other one did?