code":"404","message": "Resource not found"

Question

code":"404","message": "Resource not found"

sebastian holst 0

I have an Azure OpenAI resource with a valid GPT deployment (confirmed via Azure Portal), but when making requests via Python (AzureOpenAI SDK) or directly via REST API (/openai/deployments?api-version=2023-05-15), I'm consistently receiving a 404 "DeploymentNotFound" error. I've double-checked the endpoint URL, API version, deployment name, API key, subscription, resource group, and network settings—all are correct and match exactly with the Azure portal details. I'm looking for guidance on why Azure OpenAI is still returning 404 errors despite a confirmed deployment.

Manas Mohanty 3,210 Reputation points Microsoft External Staff

2025-05-01T03:37:21.22+00:00
Hi sebastian holst

Could you share the model, version and region for repro'ing the case.

API version

I think issue might be with API version.

I could not find mention of 2023-05-15 API version in GA or preview rest API.

2024-10-01 and 2024-10-21 are latest GA version for Data plane and Control plane (Authoring and inference) respectively.

API Specs for Preview

API Specs for GA

For Virtual network scenario

If the OpenAI is secured with virtual network, we have to check the DNS resolution from VM in same virtual network or once connected with VPN gateways that routes back to virtual network. If it is not resolving, you might need to recreate the private endpoints or fix corrupt DNS records or virtual network links. If a Custom DNS server is in use. You might need to add all C-Records in host server as per your DNS records of your OpenAI resource. nslookup <fqdninDNSrecords> -> private ip as mentioned in DNS record Refernence for Troubleshooting DNS issues - https://learn.microsoft.com/en-us/azure/machine-learning/how-to-troubleshoot-secure-connection-workspace?view=azureml-api-2

If you are trying to access the virtual network resource from public IPs, you might need to whitelist them

Also, please whitelist the Azure OpenAI and other host URLs and ports in firewall and proxy if needed https://learn.microsoft.com/en-us/azure/ai-services/cognitive-services-virtual-networks?tabs=portal

But ideally, in case of virtual network authentication failures, it throws 403's but sometimes throws 404's too.

Hope it helps. Please let us know if you are still facing challenges

Thank you.
Manas Mohanty 3,210 Reputation points Microsoft External Staff

2025-05-02T08:49:10.6666667+00:00

Hi sebastian holst

Checking to see if the above pointers helped address your issue. Please let us know if you have further queries on it.

Thank you.
sebastian holst 0 Reputation points

2025-05-02T13:31:30.3166667+00:00

Thank you for the follow-up. I have not been able to resolve the problem and I have created a and successfully deployed a second OpenAI resource and started from scratch with a very simple python script - still getting 404. I will post all of the specifics later in the day today. It has to be a configuration or versioning issue somewhere - perhaps a security requirement that I'm unaware of - it is not an incorrect key or endpoint or something like that.

2 answers

Your answer

Manas Mohanty 3,210 Reputation points Microsoft External Staff

2025-05-01T03:37:21.22+00:00

Hi sebastian holst

Could you share the model, version and region for repro'ing the case.

API version

I think issue might be with API version.

I could not find mention of 2023-05-15 API version in GA or preview rest API.

2024-10-01 and 2024-10-21 are latest GA version for Data plane and Control plane (Authoring and inference) respectively.

API Specs for Preview

API Specs for GA

For Virtual network scenario

If the OpenAI is secured with virtual network, we have to check the DNS resolution from VM in same virtual network or once connected with VPN gateways that routes back to virtual network. If it is not resolving, you might need to recreate the private endpoints or fix corrupt DNS records or virtual network links. If a Custom DNS server is in use. You might need to add all C-Records in host server as per your DNS records of your OpenAI resource. nslookup <fqdninDNSrecords> -> private ip as mentioned in DNS record Refernence for Troubleshooting DNS issues - https://learn.microsoft.com/en-us/azure/machine-learning/how-to-troubleshoot-secure-connection-workspace?view=azureml-api-2

If you are trying to access the virtual network resource from public IPs, you might need to whitelist them

Also, please whitelist the Azure OpenAI and other host URLs and ports in firewall and proxy if needed https://learn.microsoft.com/en-us/azure/ai-services/cognitive-services-virtual-networks?tabs=portal

But ideally, in case of virtual network authentication failures, it throws 403's but sometimes throws 404's too.

Hope it helps. Please let us know if you are still facing challenges

Thank you.
Manas Mohanty 3,210 Reputation points Microsoft External Staff

2025-05-02T08:49:10.6666667+00:00

Hi sebastian holst

Checking to see if the above pointers helped address your issue. Please let us know if you have further queries on it.

Thank you.
sebastian holst 0 Reputation points

2025-05-02T13:31:30.3166667+00:00

Thank you for the follow-up. I have not been able to resolve the problem and I have created a and successfully deployed a second OpenAI resource and started from scratch with a very simple python script - still getting 404. I will post all of the specifics later in the day today. It has to be a configuration or versioning issue somewhere - perhaps a security requirement that I'm unaware of - it is not an incorrect key or endpoint or something like that.

Answer 1

Deleted

This answer has been deleted due to a violation of our Code of Conduct. The answer was manually reported or identified through automated detection before action was taken. Please refer to our Code of Conduct for more information.

Comments have been turned off. Learn more

Answer 2

sebastian holst 0

I did get it to work after changing a number of settings, it was not one thing - it was complicated by the directions not mapping exactly mapping to the latest UI and inconsistencies between different sources. ...BUT, I have my app working! thanks again.

Share via

code":"404","message": "Resource not found"

2 answers

Your answer