Azure Virtual Network
An Azure networking service that is used to provision private networks and optionally to connect to on-premises datacenters.
Azure VNet Peering - Only communication in one way
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Lucas Hökerberg
0
Reputation points
So, after a lot of troubleshooting back and fourth, and different issues (sometimes full connectivity both ways, sometimes no connectivity at all), I'm now stable in the following issue.
I have two VNets in the same region (different subscriptions), let's call them vnet-1 (172.16.1.0/24) and vnet-2 (172.16.2.0/24). I have configured peering between them and the peering status is all fine. I have active and valid system routes to each peered VNet in all machines in both networks.
I can ping and RDP to a Windows VM in vnet-1 from vnet-2, but not the other way around (no ping nor RDP).
Windows Firewall is completley off in both test VMs, and the NSGs in both VNets are allowing the traffic.
Troubleshooting the connection between vnet-1 and vnet-2 gives me the below outcome (note all the failed probes):
What am I doing wrong? Or are there any issues in Azure?
Azure Virtual Network
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Lucas Hökerberg 0 Reputation points
2024-01-31T16:05:35.6+00:00 OK, wo what I've come up with this far is that as long as I have an ongoing ping from vnet-2 to vnet-1 (which is always working), I can ping/RDP/whatever between vnet-1 and vnet-2. But as soon as i stop the ping between vnet-2 and vnet-1, all communication between vnet-1 and vnet-2 stops working. This is true for every machine I have in either Vnet - to be able to ping machine x in vnet-2 from vnet-1, machine x in vnet-2 must have an ongoing ping to machine y in vnet-1 (and not some other machine).
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ChaitanyaNaykodi-MSFT 27,656 Reputation points Microsoft Employee Moderator2024-01-31T22:55:10.74+00:00 Thank you for reaching out.
Based on the information shared above. To troubleshoot the exact issue I think we will need specialized 1:1 session, where a support engineer can have a screen share session to pin point the issue. If you have a support plan you may file a support ticket, else could you please send an email to azcommunity@microsoft.com with the below details.
Subject : Attn Chaitanya
Thread URL: Link to this thread.
Subscription ID
Please let me know once you have done the same. Thank you!
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Lucas Hökerberg 0 Reputation points
2024-02-03T09:12:10.28+00:00 @ChaitanyaNaykodi-MSFT Thanks for taking your time on my issue! I have dropped you an e-mail to the azurecommunity mail address.
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ChaitanyaNaykodi-MSFT 27,656 Reputation points Microsoft Employee Moderator
2024-02-06T22:18:30.0666667+00:00 @Lucas Hökerberg
Thank you for reaching out. I have replied to your email just now. -
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Fink, Jordan 0 Reputation points2025-11-21T14:52:27.3866667+00:00 This still appears to be a issue with subnet peering as we are seeing the same symptoms. Was there ever an actual resolution?
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