I have an issue. Today, our developers had reported to me a problem that they couldn't reach SQL Server database server several hours ago. I have checked the services and i saw that they were in running state but it was not reachable remotely. And of course, i have checked the TCP/IP connection settings. They are enabled and settings are correct. What can cause such an issue? Have you ever experienced like this situation before? The error code that i get when i try to connect to server is :
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1)
This server is development server. There are 5 different SQL Server instances. And, no one can reach them. By the way, i can connect to the instances on the cmd screen. Can you help me?
The instance is running on a Windows Server Core machine, and I can connect to the instance locally from the server itself.