All ports
Port9900/SCTP
iuaPort
9900
Protocol
SCTP
Category
Registered
Service
iua
What is port 9900?
Port 9900/SCTP is a Registered port, registered with IANA for specific applications. It is associated with the iua service.
IUA
Useful commands
nmapnmap -p 9900 -sV example.comnetcatnc -zv example.com 9900curlcurl -v http://example.com:9900/telnettelnet example.com 9900bash(echo > /dev/sctp/example.com/9900) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 9900/sctpDeny
sudo ufw deny 9900/sctpiptablesAllow
sudo iptables -A INPUT -p sctp --dport 9900 -j ACCEPTDeny
sudo iptables -D INPUT -p sctp --dport 9900 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=9900/sctpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 9900" dir=in action=allow protocol=SCTP localport=9900Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 9900/SCTP?
Port 9900/SCTP is associated with the iua service. IUA
Is it safe to expose port 9900 to the Internet?
It depends on the service and configuration. Port 9900 (iua) is a Registered port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 9900 is open?
You can use nmap: `nmap -p 9900 -sV example.com`, netcat: `nc -zv example.com 9900`, or the bash command: `(echo > /dev/sctp/example.com/9900) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 9900 on my firewall?
On Linux with UFW: `sudo ufw allow 9900/sctp` (open) or `sudo ufw deny 9900/sctp` (close). With iptables: `sudo iptables -A INPUT -p sctp --dport 9900 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 9900" dir=in action=allow protocol=SCTP localport=9900`.
What applications and services use port 9900?
Port 9900/SCTP is used by the iua service. Specific uses depend on the software and configuration. Check our related tools section for more information.