All ports
Port21213/TCP
cohesity-agentPort
21213
Protocol
TCP
Category
Registered
Service
cohesity-agent
What is port 21213?
Port 21213/TCP is a Registered port, registered with IANA for specific applications. It is associated with the cohesity-agent service.
Cohesity backup agents
Useful commands
nmapnmap -p 21213 -sV example.comnetcatnc -zv example.com 21213curlcurl -v http://example.com:21213/telnettelnet example.com 21213bash(echo > /dev/tcp/example.com/21213) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 21213/tcpDeny
sudo ufw deny 21213/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 21213 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 21213 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=21213/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 21213" dir=in action=allow protocol=TCP localport=21213Security 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- Outdated versions with vulnerabilities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 21213/TCP?
Port 21213/TCP is associated with the cohesity-agent service. Cohesity backup agents
Is it safe to expose port 21213 to the Internet?
It depends on the service and configuration. Port 21213 (cohesity-agent) 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 21213 is open?
You can use nmap: `nmap -p 21213 -sV example.com`, netcat: `nc -zv example.com 21213`, or the bash command: `(echo > /dev/tcp/example.com/21213) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 21213 on my firewall?
On Linux with UFW: `sudo ufw allow 21213/tcp` (open) or `sudo ufw deny 21213/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 21213 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 21213" dir=in action=allow protocol=TCP localport=21213`.
What applications and services use port 21213?
Port 21213/TCP is used by the cohesity-agent service. Specific uses depend on the software and configuration. Check our related tools section for more information.