![]() Select the item in the table, click the Edit button, and change the port number to a different one. This is often because the port is in use by another process. If the box cannot be checked, and an error message box saying Failed to start proxy service appears then Burp is not able to open the specified port and interface. ![]() In the Proxy Listeners section, the table should show at least one entry where the Running checkbox is checked. Go to the Tools > Proxy page in the Settings dialog. If this works, then the problem might relate to the specific web site you originally visited. Try visiting another domain with the browser (ideally a well-known public domain). See What is Burp Proxy? for more help on the basics of using Burp Proxy. If this is showing an intercepted HTTP request, then turn off interception (click on the Intercept is on button to toggle the interception status). In Burp, go to the Proxy > Intercept tab. After each step, check whether you are still having problems, and only continue to the next step if things are not working. If the browser is always waiting and not showing any actual content, then please try the following steps. You can change this association to associate with Java, or better, you can launch Burp from the command line. JAR file extension with some archiving software. This probably happened because your computer is associating the. You don't need to unpack or unzip the Burp JAR file. I've unpacked the Burp JAR file what next? ![]() ![]() If you get this error message when trying to launch Burp with an extension created using the legacy Extender API, check that your BurpExtender class is declared in the burp package, and resides inside a folder called burp within your extension's JAR file. If you're still having problems, your Java installation might be corrupted, so reinstall it. If you have installed a later version of Java but an older version is still being executed, then replace java with an absolute path to the correct java executable on your system. Run the command java -version and confirm that the version being executed is 17 or later. If you're still having problems, check that your command is launching the correct version of Java. When running Burp from the command line, make sure you have included the -jar argument followed by the location of the Burp JAR file. I get an error message saying NoClassDefFoundError Look at any error messages or other output that appears on the command line, which should indicate the cause of the problem. Try launching Burp from the command line. Otherwise, the problems and solutions below might help you. If you are new to Burp and are having problems, please first read the help on Getting Started with Burp Suite, and follow the instructions there. PROFESSIONAL COMMUNITY Troubleshooting common errors within Burp Suite
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