Port 2877: BLUELANCE — The Auditor's Port

What This Port Is

Port 2877 sits in the registered port range (1024–49151). These are ports that applications and services can formally claim through IANA — not the well-known ports (0–1023) that belong to foundational protocols like HTTP and SSH, but the middle tier where most software actually lives.

IANA has assigned port 2877 to BLUELANCE, the network name for the communication protocol used by Blue Lance's LT Auditor+ software.¹

What Blue Lance Does

Blue Lance is a Houston-based cybersecurity company that builds auditing and compliance software for enterprises. Their flagship product, LT Auditor+, monitors user activity, file access, Active Directory changes, and security events across Windows and Novell environments — generating audit trails for regulations like HIPAA, SOX, PCI, and GDPR.²

LT Auditor+ runs in an agent/manager architecture: lightweight agents installed on monitored systems collect security event data and report it back to a central manager. Port 2877 is the pipe they use. Both TCP and UDP are registered, though TCP handles the actual agent-to-manager communication.³

If you're running LT Auditor+ in your environment, port 2877 needs to be open — inbound and outbound — on both the manager and any monitored agents.

The Irony

Security auditing software — software designed specifically to detect unauthorized access, catch intruders, and report who's doing what on your network — runs its own private communications channel on a port most IT professionals have never thought about. The watcher has its own port. The auditor has its own channel.

This is perfectly normal and not a criticism. But it's worth noticing that even the tools designed to make your network transparent have their own opacity.

If You See This Port Unexpectedly

If port 2877 shows up in your environment and you're not running Blue Lance software, investigate it. An open port with no known owner is a question that deserves an answer.

To check what's listening on port 2877:

Linux/macOS:

# Show the process listening on port 2877
sudo ss -tlnp | grep 2877

# Or with lsof
sudo lsof -i :2877

Windows:

# Show process listening on port 2877
netstat -ano | findstr :2877

# Then look up the PID
tasklist | findstr <PID>

Cross-platform (nmap, from another machine):

nmap -p 2877 <target-ip>