# Error Messages

<table><thead><tr><th width="172">Error code</th><th>Description</th></tr></thead><tbody><tr><td>400</td><td>Bad request: no host to connect to or incorrect request format, including the URL.</td></tr><tr><td>403</td><td>Website is blocked by NetNut due to content restrictions.</td></tr><tr><td>407</td><td>Proxy authentication error while accessing the website. Check for valid username or password.</td></tr><tr><td>490</td><td>Access point is not valid or incorrect – could be no available IPs in the country, non-existent group.</td></tr><tr><td>500</td><td>Internal server error – retry request at a later time.</td></tr><tr><td>502</td><td>Bad gateway: Assigned IP is no longer available. Wait for system to assign new IP automatically or switch to new session ID.</td></tr><tr><td>503</td><td>Proxy error or connection refused by target site.</td></tr><tr><td>522</td><td>Connection timeout: Proxy server did not receive a response in time. Retry.</td></tr></tbody></table>