- Patch VPN gateways quickly: they are a top initial access target.
- Use certificates or MFA rather than shared secrets.
- Investigate unexpected tunnels and proxies: they are also attacker tools.
Port 3307: OP Session Proxy
Port 3307 is assigned by IANA to opsession-prxy (OP Session Proxy).
3307
How opsession-prxy works
VPN, tunnels & proxiesTraffic is wrapped in a tunnel between the two ends, so the network in between only sees the tunnel.
- Transport
- TCP · UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- VPN, tunnels & proxies
Is port 3307 dangerous?
We have no specific security note for port 3307. Its risk depends on the program actually listening on it. General advice for vpn, tunnels & proxies services:
IANA registry entries for port 3307
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| opsession-prxy | 3307 | TCP, UDP | OP Session Proxy | - | - |
// source: IANA service name and port number registry
Which program uses port 3307, and is it reachable?
Linux
sudo ss -ltnup 'sport = :3307' # process listening on 3307
sudo lsof -nP -i :3307macOS
sudo lsof -nP -i :3307
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3307 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 3307 netstat -ano | findstr :3307
From another machine
nmap -p 3307 -sV <host> sudo nmap -sU -p 3307 <host> nc -zv <host> 3307
Block it in the firewall
sudo ufw deny 3307/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 3307" -Direction Inbound -LocalPort 3307 -Protocol TCP -Action Block # Windows
What is port 3307 used for?
Port 3307 is assigned by IANA to opsession-prxy (OP Session Proxy).
Is port 3307 TCP or UDP?
Port 3307 is registered for TCP and UDP.
Is it safe to open port 3307?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Patch VPN gateways quickly: they are a top initial access target.
How do I check if port 3307 is open?
On Linux run "ss -ltnup 'sport = :3307'", on macOS "lsof -nP -i :3307", and on Windows "netstat -ano | findstr :3307" to see the local process. From another machine, "nmap -p 3307 <host>" shows whether it is reachable.