This thread is resolved. Here is a description of the problem and solution.
Problem:
The client is trying to register WPML on their site but encounters a connection error stating 'Unable to get data from service. Detailed error: cURL error 28: Operation timed out after 45001 milliseconds with 0 bytes received.'
Solution:
If you're experiencing this issue, it might be due to a temporary problem blocking the connection to our servers. We recommend trying the workaround suggested in a similar case. Please ensure to back up your site before proceeding. You can find the detailed steps here: WPML support forum post.
If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent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. Additionally, please feel free to open a new support ticket for further assistance at WPML support forum.
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