cannot open port 443 on Azure VM

Question

_{Friday, October 25, 2019 3:02 AM}

I created one Azure VM (centos linux), and I can logon by using SSH through public ip. However I cannot connect with port 443 from outside of Azure though public ip.

I opened port 443 by doing the folloing:

added inbound rule in Network security Group), and open port in the firewall-cmd.

What could be the reason??

Thanks,

Zhaoming

All replies (3)

_{Friday, October 25, 2019 8:38 AM}

Hello,

Below are few suggestions for troubleshooting the issue.

Please use this tool and see if 443 port is blocked on public IP of the VM.

If it is blocked, then it could be NSG on subnets level that could be blocking the port.

Check if there are any NSG's attached to the subnet where the VM is deployed (Example: In Network section when you select the VM, if the VM has NSG only attached to NIC, you should see something like "Impacts 0 subnets, 1 network interfaces").
If there is NSG attached to subnet and NIC check the rules applied on the Subnet NSG.

Also, ensure that the source port range is set to *.

Please check these documentation for reference:

• Open ports on Azure VM

Please let me know if this helped you solve your issue. Hope to hearing back on this.

Thanks.

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_{Thursday, November 7, 2019 5:22 PM}

Any update on this? 

If the proposed answer was useful please remember to "Up-vote" and "Mark as Answer" to help the community easily find the solution. 

_{Wednesday, December 11, 2019 10:04 AM}

I am having the same problem - I have tried the above and it isn't working for me either. I have the following inbound rule set up:

Priority 350
Port 443
Protocol Any
Source Any
Destination Any
Action Allow

I have a network security group set up which contains the above rule and this is associated with the default subnet for the VM. 

When I try to use the following command to see if the port is open and listening I get no response:
sudo netstat -tulpn | grep :443

likewise with:

sudo ss -tulpn | grep 443

Any help would be gratefully received.

Thanks