Port401/TCP

ups

Port

401

Protocol

TCP

What is port 401?

Port 401/TCP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the ups service.

Uninterruptible Power Supply

Useful commands

nmapnmap -p 401 -sV example.com

netcatnc -zv example.com 401

curlcurl -v http://example.com:401/

telnettelnet example.com 401

bash(echo > /dev/tcp/example.com/401) 2>/dev/null

Firewall commands

UFWAllow

sudo ufw allow 401/tcp

Deny

sudo ufw deny 401/tcp

iptablesAllow

sudo iptables -A INPUT -p tcp --dport 401 -j ACCEPT

Deny

sudo iptables -D INPUT -p tcp --dport 401 -j ACCEPT

firewalldAllow

sudo firewall-cmd --permanent --add-port=401/tcp

WindowsAllow

netsh advfirewall firewall add rule name="Open Port 401" dir=in action=allow protocol=TCP localport=401

Security 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Outdated versions with vulnerabilities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 401/TCP?

Port 401/TCP is associated with the ups service. Uninterruptible Power Supply

Is it safe to expose port 401 to the Internet?

It depends on the service and configuration. Port 401 (ups) is a Well-Known 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 401 is open?

You can use nmap: `nmap -p 401 -sV example.com`, netcat: `nc -zv example.com 401`, or the bash command: `(echo > /dev/tcp/example.com/401) 2>/dev/null && echo "Open" || echo "Closed"`.

How do I open or close port 401 on my firewall?

On Linux with UFW: `sudo ufw allow 401/tcp` (open) or `sudo ufw deny 401/tcp` (close). With iptables: `sudo iptables -A INPUT -p tcp --dport 401 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 401" dir=in action=allow protocol=TCP localport=401`.

What applications and services use port 401?

Port 401/TCP is used by the ups service. Specific uses depend on the software and configuration. Check our related tools section for more information.