When using the advanced labs' cloud IDE, firewalls, extensions, browser settings, or proxies can block connections necessary for the IDE to operate. In this case, the page will still load, but some aspects of the IDE will not. The run button may not work, or instances might fail to connect.
Browser Incompatibility
In some cases, your browser may not properly load the IDE due to privacy settings or blocked cookies. If you encounter an issue or see a message indicating your browser is incompatible, visit this link for more information on how to enable access.
Disabling Browser Extensions and VPNs
The fastest way to check If extensions are causing the block is to use an incognito/private browsing window. If you don't see any issues in that new window, try disabling extensions one-by-one to verify which one is causing the issue. Make sure to refresh the page after each extension is disabled.
If you're using a VPN, try disabling it to determine if it is causing connectivity issues with the IDE. VPNs may block functionality.
Firewall Whitelist
If you're still having trouble after clearing your cache and cookies, check your browser's console tab to see if any red errors, like a 403 or 404 error, are visible.
Firewall issues can be resolved by whitelisting the addresses below either with your firewall provider or your proxying service. The *.codingrooms.com addresses are recommended, but some firewalls may not allow for URLs with an *.
HTTPS
*.codingrooms.com
codingrooms.com
cloudfront.net
amazonaws.com
awsstatic.com
WSS
*.codingrooms.com
codingrooms.com
firebaseio.com
Contact support if you're still having trouble after disabling extensions and whitelisting the connections above.