I can not telnet to my open port on an azure virtual server.
I open port 100 on a server and he is listening,
But The client can not access it. There is no ping and no telnet.
What is the issuse?
I can not telnet to my open port on an azure virtual server.
I open port 100 on a server and he is listening,
But The client can not access it. There is no ping and no telnet.
What is the issuse?
Hello @84254000 ,
Welcome to Microsoft Q&A Platform. Thank you for reaching out & hope you are doing well.
In order to telnet to an Azure VM on an open/listening port, you need to make sure that the particular port is allowed in the NSG (Network Security Group) of the VM NIC and it's subnet.
Please refer : https://docs.microsoft.com/en-us/azure/virtual-machines/windows/nsg-quickstart-portal
Make sure the port is not blocked by a denied rule in your NSG.
You may also refer to other connectivity issues in the below article:
https://docs.microsoft.com/en-us/azure/virtual-network/virtual-network-troubleshoot-connectivity-problem-between-vms
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.
Hi,
There can be three different issues.
1- Server itself is not listening on port 100. use netstat to find out.
2- Check policy priority in NSG. maybe it has a higher priority than the default deny policy.
3- Check if you have selected port types, like TCP, UDP, or any.
you can also use iperf or tcplisten to temporarily open ports on your server to test on different ports.
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