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Port 3762 (gbs-smp)

IANA assigns port 3762 to gbs-smp: GBS SnapMail Protocol.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gbs-smp TCP GBS SnapMail Protocol Eric Harris Braun -
gbs-smp UDP GBS SnapMail Protocol Eric Harris Braun -

Registry dates for this port: registered 2003-06.

Check what is listening on port 3762

Linux: is anything listening on TCP 3762?
sudo ss -tlnp 'sport = :3762'
Linux: UDP 3762
sudo ss -ulnp 'sport = :3762'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3762
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3762 '
Windows (Command Prompt)
netstat -ano | findstr :3762
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3762 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3762
From Windows
Test-NetConnection HOST -Port 3762
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3762

Block port 3762 in the firewall

ufw
sudo ufw deny 3762/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3762 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3762 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3762' -Direction Inbound -Protocol TCP -LocalPort 3762 -Action Block
ufw
sudo ufw deny 3762/udp
iptables
sudo iptables -A INPUT -p udp --dport 3762 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3762 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3762' -Direction Inbound -Protocol UDP -LocalPort 3762 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.