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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(25.6, 76%, 12%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBT%3C/text%3E%3C/svg%3E)
Application error with a message:
:( Application Error
If you are the application administrator, you can access the diagnostic resources.
Azure App Service is a service used to create and deploy scalable, mission-critical web apps.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(217.60000000000002, 24%, 31%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAA%3C/text%3E%3C/svg%3E)
Can you provide some more information on the error message?
The following is the error message: :( Application Error
If you are the application administrator, you can access the diagnostic resources.
Status Code: 404 Status Message: unavailable
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(304, 61%, 39%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELR%3C/text%3E%3C/svg%3E)
Hi bibin t b,
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Hi bibin t b, We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(192, 28.999999999999996%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EGK%3C/text%3E%3C/svg%3E)
Hi @bibin t b ,
Following up to check if the issue is resolved or if you need any further assistance. Let me know how it's going!
Hello bibin t b,
There must be more detail than that. If not, ensure that you've enabled logging.
How to guide: https://learn.microsoft.com/en-us/azure/app-service/troubleshoot-diagnostic-logs
What type of application are you deploying? Seen different node-versions can cause this from a different thread
Hi bibin t b,
A 404 error means the page or resource wasn’t found on the server. This usually happens if the app isn’t set up right, the URL is wrong, or routing is missing.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 77%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
Application Logging, Web Server Logging, and Detailed Error Messages are enabled. This gives detailed info to help find the problem.Node.js, check that package.json has the right start script and the app uses the correct port (usually process.env.PORT). For other apps, confirm the default document or startup command is set properly in Azure.Node.js, check that package.json has the right start script and the app uses the correct port (usually process.env.PORT). For other apps, confirm the default document or startup command is set properly in Azure.deployed and the deployment finishes without errors, as sometimes files can be missed or errors occur without warning.Node.js app, make sure the Node.js version on Azure matches your local version to avoid any issues caused by version differences.