cURL error (hooray I hear you cry!)

Hi, I have no issue until now, with many sites on the same host. But the 2 most recent installs I get the cURL error on licence key validation.
I've gone thru it with support, they find no issue or blocks. So I'm checking you don't block anything in the range:
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External connections made by shared websites will appear as from either 185.151.28.62, 185.151.28.63, 45.8.227.175 or 45.8.227.176

If you have a Scheduled Tasks/Cron Job that requires external connections, these will appear from 185.151.28.61 or 45.8.227.174

However, the above addresses are subject to change. So if possible, we'd recommend whitelisting the IP range 185.151.28.0/24 and 45.8.227.0/24.
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Thanks