Port 2083 (cPanel (HTTPS))

cPanel user control panel over HTTPS (2082 is plain HTTP). IANA also lists 2083 for RADIUS over TLS (RadSec).

Registered (user) port, 1024-49151 TCP Remote access Meant to face the internet

What port 2083 is used for

cPanel user control panel over HTTPS (2082 is plain HTTP). IANA also lists 2083 for RADIUS over TLS (RadSec).

Security: should port 2083 be open?

Meant to face the internet. Exposed on shared hosting by design; enable 2FA and cPHulk brute-force protection.

IANA assignment

Service nameProtoDescriptionAssigneeReference

radsec TCP Secure Radius Service
The TCP port 2083 was already previously assigned by IANA for "RadSec", an early implementation of RADIUS/TLS, prior to issuance of this RFC. This early implementation can be configured to be compatible to RADIUS/TLS as specified by the IETF. See [RFC 6614, Appendix A] for details. IESG RFC 6614

radsec UDP Secure Radius Service
The UDP port 2083 was already previously assigned by IANA for "RadSec", an early implementation of RADIUS/TLS, prior to issuance of this RFC. IESG RFC 7360

Registry dates for this port: registered 2005-05, last modified 2014-07-14.

Check what is listening on port 2083

Linux: is anything listening on TCP 2083?

sudo ss -tlnp 'sport = :2083'

Linux / macOS: which process owns the port

sudo lsof -nP -i :2083

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':2083 '

Windows (Command Prompt)

netstat -ano | findstr :2083

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 2083 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine

nc -vz -w 5 HOST 2083

From Windows

Test-NetConnection HOST -Port 2083

Open port 2083 in the firewall

ufw

sudo ufw allow 2083/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 2083 -j ACCEPT

nftables

sudo nft add rule inet filter input tcp dport 2083 accept

Windows Firewall

New-NetFirewallRule -DisplayName 'Allow TCP 2083' -Direction Inbound -Protocol TCP -LocalPort 2083 -Action Allow

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