Why Identity Problems Look Like Networking Problems

We spent hours debugging connectivity when the real issue was authentication. Here is why identity failures masquerade as network failures. The Error Message Lies Your app cannot connect to Azure SQL. The error says: “Connection timeout.” You check: firewall rules network security groups VNET configuration DNS resolution Everything looks correct. The issue is not networking. It is identity. The Managed Identity does not have permissions on the database. But the error said “timeout,” not “access denied.” ...

December 5, 2025 · 4 min · Jose Rodriguez