I have a domain purchased from Godaddy. Then a Virtual Machine setup on Azure with an web application installed on it.

So thus far I have:

1. An Azure VM with an application running on it, lets say the ip for the VM is 12.3.456.789
2. A domain name I purchased from godaddy, e.g mydomain.com, I then created a subdomain for e.g sub.mydomain.com
3. I then added an SSL certificate to this subdomain which worked fine, after I changed the DNS A record for the subdomain to the ip address of the VM 12.3.456.789, also the application on the VM is accessed on port 4000. So https://sub.mydomain.com:4000

The issue is that when I access my domain via https I get the ERR_SSL_PROTOCOL_ERROR in all browsers but when I access it via http then the application on it loads completely fine.

Any ideas on what I would have done wrong or left out in my setup?

Also if I did not provide enough information do let me know.

CodePudding user response：

commercial SSL certs are always signed to include the TLD

(Top Level Domain -> in your hypothetical case: mydomain.com) !

You should contact godaddy to change the certificate to change the SAN (Subject alternative Name to sub.mydomain.com)

One example: You order a ssl certificate for the subdomain www for your domain mydomain.com.

mydomain.com is valid by its nature (SAN -> it's the TLD) Whereas www.mydomain.com is the SUBJECT.

Best H.

CodePudding user response：

To rewrite to rule from https as you are getting ERR_SSL_PROTOCOL_ERROR please check you are correctly provided ssl cerficate SSL Certificate Checker as my SSL provided is DigiCert.

And to make Https ensure in your remote desktop in IIS manager click your virtual machine ->binding -> Https and port as 443 and upload certificate.

In your virtual machine try to add outbound security rule provide service as HTTPS and port as same in 443

Reference: https://learn.microsoft.com/en-us/answers/questions/23397/not-able-to-secure-windows-azure-vm-in-https.html