# Failed to Start TFTP Server - Unable to Bind to Port

## Problem

You get an error as "Unable to bind to port" when attempting to start the TFTP Server either from the TFTP Server or the Config File Manager tools.

## Cause

You will get this error in the following cases:

1. When the port is already in use
2. When OpUtils is run as a normal user in Linux OS.

## Resolution

**Check whether the port is already in use**

From the command prompt, check whether port 69 is in use using the command: **netstat -aon**. You will get to see a line similar to below in Windows OS:

UDP - `0.0.0.0`:**69** - *:* - 680

This means that the port 69 is already bind by some application whose process id is 680. You need to stop the application that is using this port.

**Start OpUtils as a Root User in Linux OS**

In Linux OS, if you want to bind any application to ports between 1 and 1023, you require superuser privilege. Since the TFTP Server is started at port 69, you should start OpUtils as a super user.

**Applies to:** Cisco Config File Manager, TFTP Server

**Keywords:** Cisco Config File, Startup Config, Running Config, TFTP, Backup Config, Download Cisco Config, Upload Cisco Config

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