how to fix HTTP Error 500.30 - ASP.NET Core app failed to start

Question

how to fix HTTP Error 500.30 - ASP.NET Core app failed to start

stephen Makumbi 10

Hi all, I am new to the Azure world so I do not know where to start to debug my issue. There seems to be zero support from the portal even if I have a pay-as-you-go account. The support system leads you through a lot of questions about the issue and in the end leaves you with no solution nor any contact with a support personnel. Very disappointing to say the least! I have an ASP.NET Core web app which is failing to run. The application is running fine on my PC. I even downloaded a publishing profile to re-publish it but that did not help. I get a 500.30 error Core app failed to start. Can someone please point me in into the right direction for diagnosis as I am getting late in the project and have tried pretty much everything I can think of. Many thanks.

Qing Guo - MSFT 896 Reputation points Microsoft External Staff

2023-04-24T02:30:04.38+00:00

Hi @stephen Makumbi , Is your project host on IIS or Azure App Service?
stephen Makumbi 10 Reputation points

2023-04-24T03:48:19.8533333+00:00

Hi Qing Guo, My project is hosted on Azure App Service. I have downloaded a new publishing profile from Azure and now this is the error I get. Severity Code Description Project File Line Suppression State Error Web deployment task failed. (Could not connect to the remote computer ("....azurewebsites.net"). On the remote computer, make sure that Web Deploy is installed and that the required process ("Web Management Service") is started. Learn more at: https://go.microsoft.com/fwlink/?LinkId=221672#ERROR_DESTINATION_NOT_REACHABLE.) This error indicates that you cannot connect to the server. Make sure the service URL is correct, firewall and network settings on this computer and on the server computer are configured properly, and the appropriate services have been started on the server. Error details: Could not connect to the remote computer (".....scm.azurewebsites.net"). On the remote computer, make sure that Web Deploy is installed and that the required process ("Web Management Service") is started. Learn more at: https://go.microsoft.com/fwlink/?LinkId=221672#ERROR_DESTINATION_NOT_REACHABLE. Unable to connect to the remote server A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 20.105.216.8:443 .... 0
Kristoffer 11 Reputation points

2023-04-24T08:53:55.5733333+00:00

From the error log it seems like the App-Service is not able to reach the internet. Is the App-Service set up with vNet integration? And if so does it have a clear path through NSG's and possibly firewalls to reach the websites stated on port 443? If the app-service is not integrated to vNet I would suggest redeploying the app-service as the fastest way to resolve the issue
stephen Makumbi 10 Reputation points

2023-04-26T02:35:52.2966667+00:00

Now that I know where to find the debug tools tools I am making progress. Many thanks for the responses.
VenkateshDodda-MSFT 24,951 Reputation points Microsoft Employee Moderator

2023-04-26T04:07:36.7866667+00:00

@stephen Makumbi Thanks for your response, I have converted my comment to answer. Please let me know if you have any further queries. Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.
ISMAGUEL 5 Reputation points

2023-05-10T22:30:26.7766667+00:00

Hello @stephen Makumbi I have exactly same problem.

Please if you got the solution i'm really interested.

Thanks to all

1 answer

Your answer

Qing Guo - MSFT 896 Reputation points Microsoft External Staff

2023-04-24T02:30:04.38+00:00

Hi @stephen Makumbi , Is your project host on IIS or Azure App Service?
stephen Makumbi 10 Reputation points

2023-04-24T03:48:19.8533333+00:00

Hi Qing Guo, My project is hosted on Azure App Service. I have downloaded a new publishing profile from Azure and now this is the error I get. Severity Code Description Project File Line Suppression State Error Web deployment task failed. (Could not connect to the remote computer ("....azurewebsites.net"). On the remote computer, make sure that Web Deploy is installed and that the required process ("Web Management Service") is started. Learn more at: https://go.microsoft.com/fwlink/?LinkId=221672#ERROR_DESTINATION_NOT_REACHABLE.) This error indicates that you cannot connect to the server. Make sure the service URL is correct, firewall and network settings on this computer and on the server computer are configured properly, and the appropriate services have been started on the server. Error details: Could not connect to the remote computer (".....scm.azurewebsites.net"). On the remote computer, make sure that Web Deploy is installed and that the required process ("Web Management Service") is started. Learn more at: https://go.microsoft.com/fwlink/?LinkId=221672#ERROR_DESTINATION_NOT_REACHABLE. Unable to connect to the remote server A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 20.105.216.8:443 .... 0
Kristoffer 11 Reputation points

2023-04-24T08:53:55.5733333+00:00

From the error log it seems like the App-Service is not able to reach the internet. Is the App-Service set up with vNet integration? And if so does it have a clear path through NSG's and possibly firewalls to reach the websites stated on port 443? If the app-service is not integrated to vNet I would suggest redeploying the app-service as the fastest way to resolve the issue
stephen Makumbi 10 Reputation points

2023-04-26T02:35:52.2966667+00:00

Now that I know where to find the debug tools tools I am making progress. Many thanks for the responses.
VenkateshDodda-MSFT 24,951 Reputation points Microsoft Employee Moderator

2023-04-26T04:07:36.7866667+00:00

@stephen Makumbi Thanks for your response, I have converted my comment to answer. Please let me know if you have any further queries. Please accept as Yes if the answer provided is useful, so that you can help others in the community looking for remediation for similar issues.
ISMAGUEL 5 Reputation points

2023-05-10T22:30:26.7766667+00:00

Hello @stephen Makumbi I have exactly same problem.

Please if you got the solution i'm really interested.

Thanks to all

Answer 1

@stephen Makumbi Thanks you for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.

Based on the shared information, we have understood that you have deployed the ASP.NET core app from local machine to azure app service and your application is failing to start with 500.30 error.
As per this troubleshooting iis documentation this seems to be an issue with the startup error and 500.30 is more generic error and this might be caused due to multiple reasons.
I would suggest you run the webapp down detector under diagnose and solve problems of your webapps to identify/understood the reason.
You can also look at the Application event logs refer to this documentation on how to access application event logs or on how to troubleshoot the startup failures in Azure app service.

For more information, you can refer to QuickStart documentation on how to deploy ast.net application to azure app service

Feel free to reach back to me if you have any questions on this.

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how to fix HTTP Error 500.30 - ASP.NET Core app failed to start

1 answer

Your answer