Port 3690: Subversion
Port 3690 is the native svn protocol port for Subversion, used when a repository is accessed with an svn:// URL instead of over HTTP. It talks to the svnserve daemon directly.
| Port number | 3690 |
|---|---|
| Service | Subversion (svn) protocol |
| Protocol | TCP |
| Category | Version control |
| Default encryption | No |
How do I check whether port 3690 is open?
Port 3690 carries TCP, so a connection either completes its handshake or it does not, which makes the check definitive.
| Question | Command | What to know |
|---|---|---|
| Is it open on a remote host? | nc -vz example.com 3690 | A TCP handshake either completes or it does not, so netcat gives a definitive answer in one line. |
| Same check on Windows | Test-NetConnection example.com -Port 3690 | Built into PowerShell. TcpTestSucceeded in the output is the answer; telnet is not installed by default on modern Windows. |
| What is listening locally? | ss -tlnp | grep ':3690 ' | Lists the process bound to port 3690 on Linux. On macOS use lsof -nP -iTCP:3690 -sTCP:LISTEN, on Windows netstat -ano | findstr :3690 |
Replace example.com with the host you are testing. A blocked port and a port with nothing listening on it look identical from the outside, so if a service should be running, check locally before blaming the firewall.
Frequently asked questions
What is port 3690 used for?
Port 3690 is the native svn protocol port for Subversion, used when a repository is accessed with an svn:// URL instead of over HTTP. It talks to the svnserve daemon directly.
Is port 3690 TCP or UDP?
Port 3690 (Subversion) uses TCP.
Is port 3690 secure?
Port 3690 is not encrypted by default. Where possible, use an encrypted alternative or tunnel it over TLS or a VPN.
Should I open port 3690 on my firewall?
Only if you specifically need Subversion. Expose it to the smallest set of trusted sources, and never open database or Windows-service ports to the whole internet.