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Port 2121 (scientia-ssdb)

IANA assigns port 2121 to scientia-ssdb: SCIENTIA-SSDB.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
scientia-ssdb TCP SCIENTIA-SSDB SYSTEMS MANAGER -
scientia-ssdb UDP SCIENTIA-SSDB SYSTEMS MANAGER -

Check what is listening on port 2121

Linux: is anything listening on TCP 2121?
sudo ss -tlnp 'sport = :2121'
Linux: UDP 2121
sudo ss -ulnp 'sport = :2121'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2121
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2121 '
Windows (Command Prompt)
netstat -ano | findstr :2121
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2121 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2121
From Windows
Test-NetConnection HOST -Port 2121
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2121

Block port 2121 in the firewall

ufw
sudo ufw deny 2121/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2121 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2121 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2121' -Direction Inbound -Protocol TCP -LocalPort 2121 -Action Block
ufw
sudo ufw deny 2121/udp
iptables
sudo iptables -A INPUT -p udp --dport 2121 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2121 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2121' -Direction Inbound -Protocol UDP -LocalPort 2121 -Action Block

Related ports

2119gsigatekeeper2120qencp2122caupc-remote2123gtp-control

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