Port 3938 (dbcontrol-agent, dbcontrol_agent)

IANA assigns port 3938 to dbcontrol-agent, dbcontrol_agent: Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent"..

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

dbcontrol-agent TCP Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent". Todd Guay -

dbcontrol_agent TCP Oracle dbControl Agent po
This entry is an alias to "dbcontrol-agent". This entry is now historic, not usable for use with many common service discovery mechanisms. Todd Guay -

dbcontrol-agent UDP Oracle dbControl Agent po IANA assigned this well-formed service name as a replacement for "dbcontrol_agent". Todd Guay -

dbcontrol_agent UDP Oracle dbControl Agent po
This entry is an alias to "dbcontrol-agent". This entry is now historic, not usable for use with many common service discovery mechanisms. Todd Guay -

Registry dates for this port: registered 2003-11.

Check what is listening on port 3938

Linux: is anything listening on TCP 3938?

sudo ss -tlnp 'sport = :3938'

Linux: UDP 3938

sudo ss -ulnp 'sport = :3938'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3938

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3938 '

Windows (Command Prompt)

netstat -ano | findstr :3938

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3938 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 3938

From Windows

Test-NetConnection HOST -Port 3938

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3938

Block port 3938 in the firewall

ufw

sudo ufw deny 3938/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3938 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3938 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3938' -Direction Inbound -Protocol TCP -LocalPort 3938 -Action Block

ufw

sudo ufw deny 3938/udp