All jobs fail to create an RPC connection with the error:
[15.05.2013 02:36:12] < 0> Error Error code: 0x80040154
[15.05.2013 02:36:12] < 0> Error Failed to create instance of DOMDocument
There is a known issue with the Veeam Transport service that can cause the above error when attempting to open new RPC connections.
There is a hotfix for this which require version 188.8.131.52 (6.5 patch 3) which can be acquired from support.
Rebooting of the proxy and Veeam Console servers or restarting the Veeam Backup Transport/Veeam Backup Proxy services can temporarily alleviate this issue as well.