If the error log is large, it can be difficult to find the correct line. If you know that a particular script is causing the error, you can search the file for this script name by using the command:.
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If you are not sure what is causing the error, you can follow the error log in one window and watch it being generated. First, in your SSH session, use the command:. Without closing the SSH session, go to a web browser and refresh the page to generate the error again. You should see the error appear in the log file. Once you find the error, copying and pasting it into Google will often yield helpful results.
Check the permissions on all of your main folders and scripts. Most Perl and CGI files need to have their permissions set to To check the permissions of files on a Linux system, connect via SSH to your server and go to the directory where the files are kept. Use the ll command to list all files and file details. The first block of letters lists the file's permissions.
There are three permission levels:. In the above example, the first file test. The second file test. To change the permissions for a file, you need to use the chmod command, along with the numerical value of the permissions level you want to set. The most common permissions levels are:.
To set this on a file, use the command:.
This permissions level can be risky, because it allows anyone to rewrite your file. Once you have finished troubleshooting, be sure to set the file back to the correct permissions. If your website relies on scripts such as Perl or CGI files , there are a number of things that can go wrong. Always check the file permissions first. If those are correct, examine the scripts themselves. Are the file paths correct? Many scripts will require other files and programs in order to run. For example, if you have a Perl script, it will start with the path to Perl.
You can use the which command to find the path to Perl or any other programming language or command with the command:. If you have scripts or CGI programs which are generating a error, check to make sure they have permission to run in the directory where they are located. Apache will not allow programs to execute by default.
Permission must be given in either an. You can grant executable permissions on a directory-by-directory basis using an. To communicate with the web app, the native app needs to provide a secure web service. Traffic sent to You might be tempted to work around these limitations by setting up a domain name in the global DNS that happens to resolve to It will put your users at risk, and your certificate may get revoked. The attacker can then pretend to be the local app and send fake responses back to the web app, which may compromise your account on the web app side, depending on how it is designed.
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The successful MitM in this situation is possible because in order to make it work, you had to ship the private key to your certificate with your native app. That means that anybody who downloads your native app gets a copy of the private key, including the attacker. This is considered a compromise of your private key, and your Certificate Authority CA is required to revoke your certificate if they become aware of it.
Many native apps have had their certificates revoked for shipping their private key.
Unfortunately, this leaves native apps without a lot of good, secure options to communicate with their corresponding web site. And the situation may get trickier in the future if browsers further tighten access to localhost from the web.
Anyone can make their own certificates without help from a CA. The simplest way to generate a private key and self-signed certificate for localhost is with this openssl command:. You can then configure your local web server with localhost.
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If you want a little more realism in your development certificates, you can use minica to generate your own local root certificate, and issue end-entity aka leaf certificates signed by it.