D365 Cloud Hosted development machines: Port 443 HTTPS Access from internal company only, not general internet.

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Posted on by jt1024

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Hello,

I have an Azure Network configuration question in case anyone knows how to do this: Port 443 general internet access is enabled on ERP Development Cloud Hosted systems by default.

MS Doc advises "On port 443 (default HTTPS protocol port), the one-box environment has a public endpoint that is exposed for HTTPS traffic. This endpoint is used by the environment URL and provides access to the product itself, which runs on the VM. By default, the endpoint is exposed to the internet. Although authorization is required for any sign-in to the site, as a best practice, you should still restrict port 443 access to clients that require it. This configuration will be specific to your organization, and you must define it after the environment is deployed." (https://learn.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/dev-tools/secure-developer-vm)

Noting that port 443 is used as part of the Microsoft Authentication process. (https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-ports)

I'm already familiar with the Networking panel of an Azure VM for RDP rule modification, but I was wondering if anyone had the skills an knowledge to most easily and effectively restrict port 443 access to our authorized users?

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nunomaia 25 Moderator on at

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Only authorized users in D365 can access 443 in a dev box, even it's a public endpoint.

It's protected by D365 security.

The most common restrictions that I have seen.

1. Block all traffic to VM's. Only allow access by using connecting to VM by Azure Firewall VPN.

2. Protected VM with Azure bastion and then users connect to VM locally

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jt1024 197 on at

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Thanks for your reply.

Agreed about protected by D365 Security, we see that in the statement from MS on page learn.microsoft.com/.../secure-developer-vm where we can read

"Although authorization is required for any sign-in to the site,"

I understand that the 'authorization' is from the Single Sign On (SSO) process.

But I am trying to follow the second part of the sentence: "as a best practice, you should still restrict port 443 access to clients that require it."

Can you expand on your suggestions 1 & 2?

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