> For the complete documentation index, see [llms.txt](https://docs.burpgpt.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.burpgpt.app/help-and-faq/faq/what-are-the-possible-causes-for-an-unsuccessful-activation-of-my-burpgpt-pro.md).

# What are the possible causes for an unsuccessful activation of my BurpGPT Pro?

There are several potential reasons for issues with the licensing system:

* **Network / Security Configuration:** Certain network setups or security systems may prevent connection to the licensing system. Ensure that **HTTP/HTTPS traffic to and from `burpgpt.app` and `burpgpt.netlify.app`** is allowed. If necessary, try adjusting your network or security settings to allow this traffic.
* **Activation limit reached:** A single licence can only be activated on the allowed number of devices. The licence dialog shows the current activation count.
* **Clock Synchronization:** Time-related activation issues might be due to system clock discrepancies. Wait a few hours before seeking further support.
* **Corrupted Download:** A corrupted .jar file download can cause licensing errors. Re-download the file to resolve these issues.
* **Java Version Compatibility:** Ensure your system meets the Java requirements listed in the [Prerequisites](/getting-started/installation.md#prerequisites) to avoid compatibility issues with the licensing system.