When trying to login using az login from VM throws EOF occurred in violation of protocol (_ssl.c:877)

Katta NagarajKumar 1

I have created VM and added a firewall to it and when trying to login using az login it failed and seen the below error.

EOF occurred in violation of protocol (_ssl.c:877).

As part of firewall all outbound is blocked except login.microsoftonline.com.

Anything need to add to outbound Target FQDN to login successfully?

Thanks & Regards
Nagaraj Katta

ChaitanyaNaykodi-MSFT 23,341 Reputation points Microsoft Employee

2022-04-12T03:15:29.11+00:00

Hello @Katta NagarajKumar ,

As we try to reproduce this issue. Can you please confirm if any NSG associated with your VM, Virtual Network is not blocking this connectivity?
Katta NagarajKumar 1 Reputation point

2022-04-12T04:15:04.137+00:00

Hi Chaitanya,

Thanks for the response, Yes we have NSG associated with the VM. But i dont see that is blocking.

In the Firewall, Application Rule Target FQDN if we specify * we are able to login successfully.
As a company policy we have to whitelist the outbound by restricting the access to specific sites. Need to understand what all sites need to whitelist to login using az login from VM.

Thanks & Regards.
Nagaraj Katta