3690
Apache Subversion (SVN) version control
Apache Subversion (SVN)
What is port 3690?
Port 3690 is used by Apache Subversion (SVN), a centralized version control system that predates Git. It is still found in enterprise environments and legacy projects. When exposed to the internet without access controls, it can allow unauthenticated read access to the entire source code repository. Access should be restricted or tunneled through SSH.
Quick checks
$
nc -zv example.com 3690
$
nmap -p 3690 example.com
$
telnet example.com 3690