.Net agent name is not working as expected. Using the application virtual directory or context path instead of the IIS web server name.
IIS Web Server Name is something like ABC -123 or ABC-123.
What happens is the server prepends an A and drops the ABC, so the agent name looks like A123 instead of ABC-123.
The APM .Net Agent Guide states the following:
By default, .NET agents that monitor web applications are automatically assigned a name based on the application virtual directory or context path. Agents that monitor non-web-based applications are assigned a name based on the application domain name. CA Technologies recommends using automatic agent naming whenever possible. However, you can explicitly assign a name to an agent.
In this case the virtual path was ABC-123. In summary, the path ends with "123" and so this is used as the Agent name. As it doesn't start with a letter, 'A' is prepended, so in the Workstation the Agent appears as "A123".