server IP address could not be found

Question

server IP address could not be found

Mike Hawke 20

Getting "server IP address could not be found" when trying to connect to web app. No errors in Azure. Everything running OK. Not made any changes to configuration. I've spent several hours trying to create a support ticket which is very frustrating and seem to be directed here instead, which I've never used before.

Anonymous

2025-05-14T04:06:50.63+00:00
Hi Mike Hawke,

I understand as it was working last week and now its not, still just we can cross check to find the root cause - as mentioned in previous answer, let try some troubleshooting steps below- If you’re using a custom domain (like www.yourcompany.com), try accessing your web app directly via its default Azure URL (e.g., https://yourwebappname.azurewebsites.net). If this works, the issue may lie in your custom domain's DNS settings.

Flush your local DNS cache. You can do this by running ipconfig /flushdns in your command prompt. This refreshes the DNS entries on your local machine.

check your local hosts file to ensure there aren't any incorrect entries overriding your DNS settings. To access this, open Notepad as an administrator, then open the hosts file located at C:\Windows\System32\drivers\etc\hosts.

Ensure that there's no firewall or network configuration issue hindering the DNS resolution or access to the Azure web app.

Could you please check the response in the private message and provide the necessary information, if you have any further questions, feel free to let us know.
Harshitha Veeramalla 1,306 Reputation points Microsoft External Staff Moderator

2025-05-14T11:14:41.9+00:00

Hi @Mike Hawke, can you please share more details about the issue. Also please check the private message and reply back with the required details.

Answer accepted by question author

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Anonymous

2025-05-14T04:06:50.63+00:00

Hi Mike Hawke,

I understand as it was working last week and now its not, still just we can cross check to find the root cause - as mentioned in previous answer, let try some troubleshooting steps below- If you’re using a custom domain (like www.yourcompany.com), try accessing your web app directly via its default Azure URL (e.g., https://yourwebappname.azurewebsites.net). If this works, the issue may lie in your custom domain's DNS settings.

Flush your local DNS cache. You can do this by running ipconfig /flushdns in your command prompt. This refreshes the DNS entries on your local machine.

check your local hosts file to ensure there aren't any incorrect entries overriding your DNS settings. To access this, open Notepad as an administrator, then open the hosts file located at C:\Windows\System32\drivers\etc\hosts.

Ensure that there's no firewall or network configuration issue hindering the DNS resolution or access to the Azure web app.

Could you please check the response in the private message and provide the necessary information, if you have any further questions, feel free to let us know.
Harshitha Veeramalla 1,306 Reputation points Microsoft External Staff Moderator

2025-05-14T11:14:41.9+00:00

Hi @Mike Hawke, can you please share more details about the issue. Also please check the private message and reply back with the required details.

Answer 1

Vlad Costa 1,565

It sounds basic, but the most common cause of this error is a simple typo in the domain name. Make sure you are typing the URL exactly as it should be.

If you are using a custom domain (like www.yourcompany.com), try accessing your web app directly using its default .azurewebsites.net address (e.g., https://yourwebappname.azurewebsites.net). If this works, the problem will be with your custom domain's DNS configuration.

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Answer 2

Mike Hawke 20

Quick update. I checked the custom domain using whois and the domain registration has just expired. I guess sorting that out will get me back up and running. Geez I wish I could have had a notification of some sort - i guess the team who set this up (now sadly gone) would have got it.

Vlad Costa 1,565 Reputation points

2025-05-14T12:22:50.36+00:00

Thanks for letting us know @Mike Hawke , if you think my answer helped you. Please mark it as accepted. Thanks in advance.

Answer 3

Thanks very much for your help! I've checked the custom domain and there doesn't look like there is a DNS configuration setup. I'm not familiar with these settings so will try and figure out how to do it, but my question is where would my missing config have gone? As I said, the system has been fine for years and I've never had to look at this before. Should I just go ahead and google how to do this setup or should I try and get to the root cause first? Really appreciate your help and advice as this is not my area of expertise.

Answer 4

Mike Hawke 20

We haven't changed any settings or config that would explain why this worked last week (and subsequent years) but not now.

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server IP address could not be found

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