I always get the message
ESX Connect Error: The underlying connection was closed: An unexpected error occurred on a send.
This is the first server with a problem and I don't know how to fix it.
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Do you see this error while adding the server or during backup?
I get this error while adding a server, i think it is the last step before the server will be added.
Please test if you are able to connect to the ESXi server via SSH.For example by using Putty.
I used Putty for the connection test, it succeeded.
Any other ideas what I can do?
I solved my problem.
I installed a new OS and everything is fine now.