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Port 6102 (synchronet-upd)

IANA assigns port 6102 to synchronet-upd: SynchroNet-upd.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
synchronet-upd TCP SynchroNet-upd Arne Haugland -
synchronet-upd UDP SynchroNet-upd Arne Haugland -

Check what is listening on port 6102

Linux: is anything listening on TCP 6102?
sudo ss -tlnp 'sport = :6102'
Linux: UDP 6102
sudo ss -ulnp 'sport = :6102'
Linux / macOS: which process owns the port
sudo lsof -nP -i :6102
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':6102 '
Windows (Command Prompt)
netstat -ano | findstr :6102
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 6102 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 6102
From Windows
Test-NetConnection HOST -Port 6102
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 6102

Block port 6102 in the firewall

ufw
sudo ufw deny 6102/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 6102 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 6102 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 6102' -Direction Inbound -Protocol TCP -LocalPort 6102 -Action Block
ufw
sudo ufw deny 6102/udp
iptables
sudo iptables -A INPUT -p udp --dport 6102 -j DROP
nftables
sudo nft add rule inet filter input udp dport 6102 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 6102' -Direction Inbound -Protocol UDP -LocalPort 6102 -Action Block

Related ports

6100synchronet-db6101synchronet-rtc6103rets6104dbdb

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