New VM-100 deployment, cannot ping or tracert to external websites

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New VM-100 deployment, cannot ping or tracert to external websites

L1 Bithead

Just setup a new VM-100 device in Azure. SSL decryption and security policies are in place. My test client PC can browse the web, and all of the policies seem to work.


However, I cannot ping or tracert to any public website (e.g., The DNS resolution works, I see that the ping traffic is allowed in the monitor tab, and I disabled SSL decryption as a test, but it still didn't work.


I'm sure that it's something simple, but anyone have any ideas?






L3 Networker

Hi @rbottiglieri ,

Please make sure you have a PublicIP assigned to your untrust interface . In Azure Ping and traceroute will not work if you didnnt have a public IP in the untrust interface. Please try and let me know,




Hi @RamprakashRT, thanks for this.


I had actually just tried that before your post. I originally had a secondary IP address configured on the interface with a public IP address, but that didn't work. So, I scrapped that, and put the public IP address right on the interface. I can now ping, but tracert isn't working. Do I need to modify the NSG to allow all inbound internet traffic on the untrust interface?





Hi @rbottiglieri 


I suspect the security policy in the firewall. Just to isolate , is it possible to create a plain firewall rule for the test machine by allowing all the traffic in the firewall.  Also untrust interface outbound NSG 'allow all' and trust interface inbound NSG 'allow all'.






I did some digging, and I think the issue is that Azure does not permit you to ping the default gateway in an Azure VNET. Check out this doc:


Adding the public IP to the interface, I can now ping public internet addresses. However, traceroute does not work, and by the looks of things, it is not supposed to work.


Thanks for the help.



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