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Port 8787 (msgsrvr)

IANA assigns port 8787 to msgsrvr: Message Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
msgsrvr TCP Message Server Michael O Brien -
msgsrvr UDP Message Server Michael O Brien -

Registry dates for this port: registered 2003-03.

Check what is listening on port 8787

Linux: is anything listening on TCP 8787?
sudo ss -tlnp 'sport = :8787'
Linux: UDP 8787
sudo ss -ulnp 'sport = :8787'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8787
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8787 '
Windows (Command Prompt)
netstat -ano | findstr :8787
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8787 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8787
From Windows
Test-NetConnection HOST -Port 8787
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 8787

Block port 8787 in the firewall

ufw
sudo ufw deny 8787/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8787 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8787 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8787' -Direction Inbound -Protocol TCP -LocalPort 8787 -Action Block
ufw
sudo ufw deny 8787/udp
iptables
sudo iptables -A INPUT -p udp --dport 8787 -j DROP
nftables
sudo nft add rule inet filter input udp dport 8787 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 8787' -Direction Inbound -Protocol UDP -LocalPort 8787 -Action Block

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