Suddenly unable access http and https on my virtual machine classic

Question

My Server runs for a few years without an issue but today I got an email alert from the uptime service that my website is down.

 - My website can't be accessed with an error "This site can’t be reached.  took too long to respond."
 - SSH also cannot be accessed.
 - From VM Overview All server resources look okay. CPU usage less.
 - Run troubleshooter from the support menu, but I didn't find any issue.

Try 1
 - Restart VM. But it seems nothing happened after 5 minutes.
 
Try 2
 - Stop and Start VM.
 - It takes longer to stop and start a VM.
 - My Public IP suddenly changed. I have updated my website DNS to the new IP.
 - My website still cannot be accessed.
 - SSH can access at this stage.

Try 3
 - Change VM size to a higher plan.
 - My website still cannot be accessed.

Try 4
 - Change VM back to original size.
 - My website still cannot be accessed.

Try 5
 - Do redeploying (which will migrate it to a new Azure host).
 - My website still cannot be accessed.

I have tried to stop iptables. Also delete HTTP HTTPS from the endpoint and add back. But I still cannot access my website.

Right now I cannot access all my websites.

Any solution for this issue?

Answer 1

Based on our discussion it looks like you have a dynamic IP address. I would look into setting up a Public Static IP Address:

https://learn.microsoft.com/en-us/azure/virtual-network/ip-services/virtual-network-deploy-static-pip-arm-portal

Once you have a static IP address you can then point your DNS to that static IP.

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If this helps please mark as correct answer or upvote. Thanks!