HTTPfy

Port 3877 (xmpcr-interface)

IANA assigns port 3877 to xmpcr-interface: XMPCR Interface Port.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
xmpcr-interface TCP XMPCR Interface Port Christopher Carlson -
xmpcr-interface UDP XMPCR Interface Port Christopher Carlson -

Registry dates for this port: registered 2003-10.

Check what is listening on port 3877

Linux: is anything listening on TCP 3877?
sudo ss -tlnp 'sport = :3877'
Linux: UDP 3877
sudo ss -ulnp 'sport = :3877'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3877
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3877 '
Windows (Command Prompt)
netstat -ano | findstr :3877
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3877 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3877
From Windows
Test-NetConnection HOST -Port 3877
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3877

Block port 3877 in the firewall

ufw
sudo ufw deny 3877/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3877 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3877 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3877' -Direction Inbound -Protocol TCP -LocalPort 3877 -Action Block
ufw
sudo ufw deny 3877/udp
iptables
sudo iptables -A INPUT -p udp --dport 3877 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3877 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3877' -Direction Inbound -Protocol UDP -LocalPort 3877 -Action Block

Related ports

3875pnbscada3876dl-agent, dl_agent3878fotogcad3879appss-lm

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.