> For the complete documentation index, see [llms.txt](https://docs.wisej.com/deployment/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wisej.com/deployment/troubleshooting/license-activation.md).

# License Activation

In some scenarios, the license can't be validated. 

#### Potential Issues During License Activation

1. **Network Connectivity**: Ensure a stable internet connection.
2. **License Limit**: Verify the license hasn't exceeded its activation limit.
3. **Incorrect License Key**: Double-check the entered key for any typos.
4. **Firewalls/Antivirus**: These might block the activation process; consider temporary disablement.
5. **Black-listed domain:** Contact us for more information on what IPs and Domains to whitelist.

The "wisej-server.lic" file might become corrupted or be replaced by an outdated version on your server, causing the Invalid License popup to appear.

**To mitigate this issue, we advise that you start by:**

1. Deleting any **old wisej-license.lic** file.
2. Restarting the server.
3. Set the wisej-server.lic file to read-only.