This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is experiencing persistent connection issues with WPML on their website hosted in China. WPML is unable to connect to wpml.org for updates or validation due to suspected firewall or geoblocking restrictions.
Solution:
We recommend the client to contact their hosting provider to whitelist the following domains to ensure they are not being blocked:
- wpml.org
- cdn.wpml.org
- api.wpml.org
- api.toolset.com
- cloudfront.net
We have confirmed from our side that the site is not being blocked by our services.
If this solution does not resolve the issue or seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If the problem persists, please open a new support ticket at WPML support forum for further assistance.
This is the technical support forum for WPML - the multilingual WordPress plugin.
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Last updated by 1 month ago.
Assisted by: Shekhar Bhandari.


