René Heijnen

Troubleshooting Log

Short, punchy solutions to real-world cloud engineering problems. Optimized for 3 AM debugging.

Azure Appliance: Connection Failure to Update Services

Azure Appliance: Connection Failure to Update Services

Problem

Appliance unable to retrieve updates; DNS resolves but TCP/443 traffic to the internet is blocked.

Solution

Consolidate NSGs by removing NIC-level groups and adding a Subnet-level Allow rule for Service Tag: Internet on port 443.

Fix: New-AzADServicePrincipal Error - Resource does not exist

Fix: New-AzADServicePrincipal Error - Resource does not exist

Problem

Creating a Service Principal via New-AzADServicePrincipal fails intermittently due to replication timing.

Solution

Create the App Registration explicitly and introduce a replication delay before creating the Service Principal.

Ansible: Failed to connect to the host via ssh

Ansible: Failed to connect to the host via ssh

Problem

Azure DevOps pipeline fails with 'Failed to connect to the host via ssh' when running baseline against Ansible host.

Solution

Comment out the FQDN override for ansible_host in your inventory/compose file; it breaks DNS resolution.