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Failed to connect to the endpoint

  • September 24, 2025
  • 7 comments
  • 176 views
hs08
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  • hs08
  • Comes here often
  • 81 comments

I have VBR installed in Site-B to backup VM under hyper-v and vmware in Site-A.

Connection from Site-B to Site-A using ipsec vpn site to site with 2 internet link for redundant.

The VPN have same policy for both connections.

 

When the link use primary link then the VBR can backup the VM but if the primary link and connection switched to the backup link then i got error only for Vmware when using backup proxy.

I try to ping from the backup proxy in Site-A then the proxy is able to reach HS-W2019.

This error mean the backup proxy is not able to connect to the HS-W2K19 on port 2503?

 

Error: Failed to connect to the endpoint [HS-W2K19:2503]. A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond
 

Handian - VMCE2024

7 comments

Chris.Childerhose
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  • Chris.Childerhose
  • Veeam Legend, Veeam Vanguard
  • 9587 comments
  • September 25, 2025

Yes that is the issue and you will need to do further fail over testing with your links I think.  Veeam also has preferred networks so you might want to check that too.

Chris Childerhose - VMCA2024 | VMCE2023 | VMCE-SP2024 | Veeam Vanguard 8* | Veeam Legend 5* | VUG Canada Leader | vExpert 6* | Toronto VMUG Leader | VCAP-DCV/VCP-DCV | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech
Andanet
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  • Andanet
  • Veeam Legend
  • 422 comments
  • September 25, 2025

From my perspective is a network connectivity issue.

Troubleshooting Steps

Check Network Connectivity: 

You can use the Test-NetConnection command in PowerShell to test the connection to the port on the target machine

Verify Firewall Rules: Ensure that your physical firewall, between VBR and HS-W2K19, allow traffic on the needed Veeam ports for the secondary link.

Antonio D'Andrea | VMCE 2021 | VMCA 2022 | VMTSP2024 | Veeam Legend | VUG Italy Leader | Object First Ace | VCP6-DCV | I want it written on my tombstone "Please start a restore to the last valid backup"
Jean.peres.bkp
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  • Jean.peres.bkp
  • Veeam Legend
  • 161 comments
  • September 25, 2025

@hs08, have you tried this one yet?

KB4557: "Established connection failed because connected host has failed to respond :10005"

Jean Sczepanski Peres
Andanet
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  • Andanet
  • Veeam Legend
  • 422 comments
  • September 25, 2025

Hi Jean My reply was wothout reading the KB… 😁

Antonio D'Andrea | VMCE 2021 | VMCA 2022 | VMTSP2024 | Veeam Legend | VUG Italy Leader | Object First Ace | VCP6-DCV | I want it written on my tombstone "Please start a restore to the last valid backup"
AndrePulia
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  • AndrePulia
  • Veeam Vanguard
  • 603 comments
  • September 25, 2025

​@hs08 You could also check this KB https://www.veeam.com/kb4444 to test connections

André Pulia - VMCA | VMCE | VMCT |Veeam Vanguard | VUG Leader Brazil | ObjectFirst ACE | HPECI | VCI | Nutanix Certified Instructor | Twitter: @andrepulia | Blog Site – https://pulia.com.br | https://www.credly.com/users/andre-pulia
Iams3le
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  • Iams3le
  • Veeam Legend
  • 1547 comments
  • September 28, 2025

Hi Jean My reply was wothout reading the KB… 😁

Regardless, you are also right about your assumptions!

[Microsoft MVP 2x | Veeam Legend (2021 -2025) | VMware vExpert 5x | Cisco Champion 3x | Object First Ace 2x]
Chris.Childerhose
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  • Chris.Childerhose
  • Veeam Legend, Veeam Vanguard
  • 9587 comments
  • October 22, 2025

​@hs08  - just wanted to follow up and see if you were able to get an answer from this thread? If so please mark the best answer or if you figured it out post the answer then mark that one as the best answer.

Chris Childerhose - VMCA2024 | VMCE2023 | VMCE-SP2024 | Veeam Vanguard 8* | Veeam Legend 5* | VUG Canada Leader | vExpert 6* | Toronto VMUG Leader | VCAP-DCV/VCP-DCV | Object First Ace | Cisco Champion | Twitter: @cchilderhose | Blog Site – https://just-virtualization.tech


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