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Port 3191 (csvr-sslproxy)

IANA assigns port 3191 to csvr-sslproxy: ConServR SSL Proxy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
csvr-sslproxy TCP ConServR SSL Proxy Mikhail Kruk -
csvr-sslproxy UDP ConServR SSL Proxy Mikhail Kruk -

Check what is listening on port 3191

Linux: is anything listening on TCP 3191?
sudo ss -tlnp 'sport = :3191'
Linux: UDP 3191
sudo ss -ulnp 'sport = :3191'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3191
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3191 '
Windows (Command Prompt)
netstat -ano | findstr :3191
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3191 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3191
From Windows
Test-NetConnection HOST -Port 3191
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3191

Block port 3191 in the firewall

ufw
sudo ufw deny 3191/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3191 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3191' -Direction Inbound -Protocol TCP -LocalPort 3191 -Action Block
ufw
sudo ufw deny 3191/udp
iptables
sudo iptables -A INPUT -p udp --dport 3191 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3191' -Direction Inbound -Protocol UDP -LocalPort 3191 -Action Block

Related ports

3189pcle-infex3190csvr-proxy3192firemonrcc3193spandataport

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