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Port 5767 (s-openmail)

IANA assigns port 5767 to s-openmail: OpenMail Suer Agent Layer (Secure).

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
s-openmail TCP OpenMail Suer Agent Layer (Secure) OpenMail Encyclopedi, Don Loughry -
s-openmail UDP OpenMail Suer Agent Layer (Secure) OpenMail Encyclopedi, Don Loughry -

Check what is listening on port 5767

Linux: is anything listening on TCP 5767?
sudo ss -tlnp 'sport = :5767'
Linux: UDP 5767
sudo ss -ulnp 'sport = :5767'
Linux / macOS: which process owns the port
sudo lsof -nP -i :5767
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':5767 '
Windows (Command Prompt)
netstat -ano | findstr :5767
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 5767 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 5767
From Windows
Test-NetConnection HOST -Port 5767
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 5767

Block port 5767 in the firewall

ufw
sudo ufw deny 5767/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 5767 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 5767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 5767' -Direction Inbound -Protocol TCP -LocalPort 5767 -Action Block
ufw
sudo ufw deny 5767/udp
iptables
sudo iptables -A INPUT -p udp --dport 5767 -j DROP
nftables
sudo nft add rule inet filter input udp dport 5767 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 5767' -Direction Inbound -Protocol UDP -LocalPort 5767 -Action Block

Related ports

5757x500ms5766openmailns5768openmailpxy5769spramsca

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