In general, it is possible to use Power CRM without an internet connection on a localhost installation. However, some features:-

• such as Dropbox file chooser
• Pusher.com real-time notifications
• auto updates Google reCaptcha
• media
• all online payment gateways
• and E-Signature (v2.0.0 and above), will not be available.

These features are not essential when using Power CRM in offline mode, but it is still worth noting their unavailability.

The reason why contacts' email addresses must be unique is because of the email piping/auto-importing tickets feature and also because the email is utilized for login purposes.

If there is a duplicate email address in the system database, the script will not be able to identify the company to link the imported ticket to.

If you encounter an HTTP ERROR 500 while using Power CRM, it means that there is an error occurring in the back-end, which is causing the software to stop working.

To easily determine the issue, the best approach is to turn on the debug mode. This can be done by following the steps below:

If you are developing custom features for Power CRM or you are experiencing an internal server error, you can turn on the debug mode to see any error messages. Navigate to the directory where Perfex CRM is installed and find index.php. Open the file and locate the line:

define('ENVIRONMENT', 'production');

Change this line to:

define('ENVIRONMENT', 'development');

By doing this, any errors that are thrown will be visible on the screen, and they will also be logged in the application/logs directory. It is important to note that in development mode, you may see some errors and deprecation warnings. For this reason, it is always recommended to set the environment to "production" if you are not actively developing some features/modules or trying to test some code.

If the error messages are not clear enough to help you resolve the issue, you can open a support ticket at support@vendsoftwares.com. Our team will be happy to guide you further and help you resolve the issue in a timely manner.

Certainly, you can use Cloudflare with Power CRM. However, you must disable a specific Cloudflare feature, and it is crucial to clear your Cloudflare cache after each update. Please refer to the following points:

• Ensure that the Cloudflare Rocket Loader feature is turned off.
• After every update, remember to purge your Cloudflare cache.