Hi there,

Can you tell us a bit more of information?

I mea, how is refusing the connection?
Veeam? vcenter? the host?

also would be helpful a little draw or picture.

Hi @Anandu. A few comments:

• Different Veeam servers should be utilising different servers for their components, to avoid version mismatch issues like you could be experiencing. Definitely get them both patched to the same version. Not just V11a but also subsequent culmulative patch. See here https://www.veeam.com/kb4245
• Check the services started correctly, and again after rectifying the patch mismatch above.
• Confirm you have all necessary ports opened on your firewalls: https://helpcenter.veeam.com/docs/backup/vsphere/used_ports.html?ver=110#cdp-components

Once you’ve got these bits out the way, if the issue persists we can start talking log outputs etc.

@Anandu Same problem as this thread

vCenter server warning | Veeam Community Resource Hub

Can you give feedback?

thx m8

 @Anandu This error "he target machine actively refused it" as already said is a generic error .

• Have you restarted vcenter (Windows)? XD
• Wrong NAT?
• It could also be asymmetric routing?
• Vcenter local Firewall?
• Firewall roles?

First you need to check the connectivity.

tests all ports required for CDP flow

• try to do a telnet with the ip of the VCenter on port 443, if it does not respond it is FW between networks, FW on the vcenter

• try to do a tracert with ip of the Vcenter check how many hops it does and if it stops is a clue.

Then if there is connectivity check the user used if it has all the necessary permissions.
As mentioned by @BertrandFR  check the logs! the gospel :D
GL

vCenter

If it is the vCenter giving the message, then I would definitely look for blocked ports and/or missing user permissions.

Right, also check the certificate, if self signed look at vcenter, or te generate it and re add vcenter to veeam.