All ports
Port8991/TCP
https-wmapPort
8991
Protocol
TCP
Category
Registered
Service
https-wmap
What is port 8991?
Port 8991/TCP is a Registered port, registered with IANA for specific applications. It is associated with the https-wmap service.
webmail HTTPS service
Useful commands
nmapnmap -p 8991 -sV example.comnetcatnc -zv example.com 8991curlcurl -v http://example.com:8991/telnettelnet example.com 8991bash(echo > /dev/tcp/example.com/8991) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 8991/tcpDeny
sudo ufw deny 8991/tcpiptablesAllow
sudo iptables -A INPUT -p tcp --dport 8991 -j ACCEPTDeny
sudo iptables -D INPUT -p tcp --dport 8991 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=8991/tcpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 8991" dir=in action=allow protocol=TCP localport=8991Security Risks
- Incorrect TLS/SSL configuration
- Man-in-the-Middle attacks if certificate is invalid
- Protocol implementation vulnerabilities
- Exposure of web services with weak authentication
Frequently Asked Questions
What service runs on port 8991/TCP?
Port 8991/TCP is associated with the https-wmap service. webmail HTTPS service
Is it safe to expose port 8991 to the Internet?
It depends on the service and configuration. Port 8991 (https-wmap) 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 8991 is open?
You can use nmap: `nmap -p 8991 -sV example.com`, netcat: `nc -zv example.com 8991`, or the bash command: `(echo > /dev/tcp/example.com/8991) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 8991 on my firewall?
On Linux with UFW: `sudo ufw allow 8991/tcp` (open) or `sudo ufw deny 8991/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 8991 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 8991" dir=in action=allow protocol=TCP localport=8991`.
What applications and services use port 8991?
Port 8991/TCP is used by the https-wmap service. Specific uses depend on the software and configuration. Check our related tools section for more information.