Veeam troubleshooting: Failed to login to “vcenter.domain.local” by SOAP, port 443, user “”, proxy srv: port:0 Cannot complete login due to an incorrect user name or password.

Today one of our regular customers called with a wierd error. After upgrading their VMware ESXi hosts and vCenter to 5.1 (unsupported) they could suddenly no longer backup VMs one of their two hosts using Veeam.

The log would show:
Failed to login to “vcenter.domain.local” by SOAP, port 443, user “”, proxy srv: port:0
Cannot complete login due to an incorrect user name or password.

I am sure this is something that has been fixed in Veeam B&R 6.5 (soon to be released).

Quick fix
#1 Remove the vCenter from Veeam (unfortunately this means deleting all jobs currently using it or as a minimum remove the VMs from the job).
#2 Add each host as a standalone host with correct credentials
#3 Re-add vCenter
#4 Add the standalone hosts in the backup job

UPDATE 2012-12-18
What seems to happen sometimes are that the ESXi host(s) upgraded from fx 4.1 to 5.1 will stay in the SQL database. You can manually go in and remove these, however make sure you make a database backup first and if you feel unsure then do not hesitate to call Veeam and ask for their help to resolve this.

UPDATE 2013-07-26
Veeam has released patch 3 for Veeam Backup & Replication 6.5 which now solves this issue. Looking at their KB article 1751 we now see “Upgrading vCenter or ESX(i) hosts may result in duplicate hosts appearing under Managed Servers, causing jobs to fail with object not found errors“. If you have not already installed patch 3 I suggest you do that now.

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