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Port 3307 (opsession-prxy)

IANA assigns port 3307 to opsession-prxy: OP Session Proxy.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
opsession-prxy TCP OP Session Proxy Amir Blich -
opsession-prxy UDP OP Session Proxy Amir Blich -

Check what is listening on port 3307

Linux: is anything listening on TCP 3307?
sudo ss -tlnp 'sport = :3307'
Linux: UDP 3307
sudo ss -ulnp 'sport = :3307'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3307
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3307 '
Windows (Command Prompt)
netstat -ano | findstr :3307
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3307 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3307
From Windows
Test-NetConnection HOST -Port 3307
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3307

Block port 3307 in the firewall

ufw
sudo ufw deny 3307/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3307 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3307 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3307' -Direction Inbound -Protocol TCP -LocalPort 3307 -Action Block
ufw
sudo ufw deny 3307/udp
iptables
sudo iptables -A INPUT -p udp --dport 3307 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3307 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3307' -Direction Inbound -Protocol UDP -LocalPort 3307 -Action Block

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