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How to resolve the Unreachable problem within ExpressRoute circuit

DONG CHEN 0 Reputation points
2025-11-26T12:17:22.09+00:00

1,The virtual machine(Eden4) in ExpressRoute circuit virtual netwok is unable to access the specified address (192.xx.233:13202) by ExpressRouteCircuit's Azure Private Peering.

2,The virtual machine(Eden4) is also unable to access the on-premises IP address (169.xxx.242) or Ithe Microsoft IP address(169.xx.241) in ARP tables of AzurePrivatePeering

example:

ping 169.xx.242/169.xx.241

tracert 169.x.x.242/169.x.x.241

3,After conducting a test analysis using "Network Watcher | Connection Troubleshoot", it was found that both the Status and Next hop in the Connectivity details are fine, but the actual Connectivity test result shows "Unreachable."

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How to resolve the Unreachable problem?

Azure ExpressRoute
Azure ExpressRoute
An Azure service that provides private connections between Azure datacenters and infrastructure, either on premises or in a colocation environment.

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  1. Vallepu Venkateswarlu 1,485 Reputation points Microsoft External Staff Moderator
    2025-11-26T16:20:17.8733333+00:00

    Hi @ DONG CHEN,

    Welcome to Microsoft Q&A Platform.

    From an Azure VM (eden4) we see TCP SYNs/ICMP targeted at our on-prem IP 192.xxx.233:13202, and Network Watcher connection troubleshoot shows next-hop = MicrosoftEdge but Connectivity test: Unreachable (probes 30/30 failed).

    Please check the CE/router for VLAN and ARP for Azure private peering IPs (169.xxx.xxx.xxx), confirm CE receives the packets from Azure and forwards them to 192.xxx.233. Also capture traffic on the CE for that time window.

    Please Verify BGP session is established, and provider is not filtering the prefixes or the port.

    You can use the Test private peering connectivity tool in the Azure portal to validate packet flow between your on-premises network and Azure resources and also run the PsPing utility to assess connectivity from your on-premises IP to the Azure IP addresses

    Ref: Verify ExpressRoute connectivity and Verify ExpressRoute connectivity

    Kindly let us know if the above helps or you need further assistance on this issue.

    Please "Accept the answer" if the information helped you. This will help us and others in the community as well.

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