Why is Activity Monitor Login blank, and what is that process doing?

I observe regularly occurring User processes (User Process = 1) connecting from load-balanced application servers to a database server (see Environment Details below) on the same internal network, where the Login associated with the process (session) is blank (see Figure 1).

Right-clicking on any of these rows to obtain Details of the process produces no result (i.e. no Details window [see Figure 2]).

So far, I have:

• Performed a Profiler trace: blank login process not captured by trace
• Read Kendra Little’s post “Why I Don’t Use SQL Server’s Activity Monitor“
• Used Adam Machanic’s “sp_WhoIsActive“, and the blank login process is not included in the results.

Questions

1. How do I identify the Login for this process?
2. How do I identify the command for this process?
3. Is the Host Name reported by Activity Monitor incorrect/misleading?

I would appreciate any guidance you can provide. Thank you (in advance).

Figure 1: Blank Logins for Processes

Figure 2: Details Window

Environment Details:

• Windows Server 2008R2 Cluster
• SQL Server 2012 (11.0.5582) Standard