KB ID 0000758
Problem
Seen when running Veeam Backup and Replication.
Error
Task Failed Error: No connections could be made because the target machine actively refused it
Also when trying to connect to VMware VCenter from the Backup and Replication management console;
Error
Failed to connect to “Host-name” by SOAP, port 443, user “User-Name”, proxy srv: port:0
Unable to connect to the remote server
No connections could be made because the target machine actively refused it {IP-Address}:443
Solution
There are a few things that might cause this, make sure the Veeam Server can “Ping” the VCenter and the hosts. Also make sure if you use a proxy server there is an exception for traffic going to this IP address.
In my case the problem was simply that the VMware Server service was not running on the Virtual Center.
Related Articles, References, Credits, or External Links
Veeam Backup and Recovery Download
Veeam Availability Suite Download
Veeam Backup For Office 365 Download