Thank you. I’ve installed the test update and tested it several times. It seems to have stopped the Gateway timeouts. So many thanks for giving it your prompt attention.
I’ve opened a ticket with my host siteground and they gave me this reply:
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I would like to clarify that you can see the opened, by default, ports here:
https://www.siteground.com/kb/which_ports_are_open_on_siteground_shared_servers/
If any plugin is trying to make an outgoing connection via a specific hostname and port, please, let us know of the hostname and port so we can check if it is blocked.
I am afraid that without the hostname and port number provided by you, we won’t be able to confirm whether the connection is blocked or not.
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Let me know if you want me to take this further with siteground.
many thanks again.