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Port 2252 (njenet-ssl)

IANA assigns port 2252 to njenet-ssl: NJENET using SSL.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
njenet-ssl TCP NJENET using SSL Hans U Schmidt -
njenet-ssl UDP NJENET using SSL Hans U Schmidt -

Check what is listening on port 2252

Linux: is anything listening on TCP 2252?
sudo ss -tlnp 'sport = :2252'
Linux: UDP 2252
sudo ss -ulnp 'sport = :2252'
Linux / macOS: which process owns the port
sudo lsof -nP -i :2252
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':2252 '
Windows (Command Prompt)
netstat -ano | findstr :2252
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 2252 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 2252
From Windows
Test-NetConnection HOST -Port 2252
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 2252

Block port 2252 in the firewall

ufw
sudo ufw deny 2252/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 2252 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 2252 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 2252' -Direction Inbound -Protocol TCP -LocalPort 2252 -Action Block
ufw
sudo ufw deny 2252/udp
iptables
sudo iptables -A INPUT -p udp --dport 2252 -j DROP
nftables
sudo nft add rule inet filter input udp dport 2252 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 2252' -Direction Inbound -Protocol UDP -LocalPort 2252 -Action Block

Related ports

2250remote-collab2251dif-port2253dtv-chan-req2254seispoc

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