Windows Defender Firewall causing 'the site took too long to respond' in all browsers

[DuncanCR]

Acer laptop / Windows 10 Windows Defender firewall has suddenly started causing all browsers on my Acer laptop to time out with the 'site took too long to respond' message. When I switch off Defender Firewall for public network settings, the browsers work normally. A virtually identical laptop on the same home network is having no problems at all. I've compared the firewall settings. The identical laptop is accessing web pages fine with both public and private network firewall on. The problem on my laptop is happening on Edge, Google Chrome, Firefox and Brave. All are on the 'allowed' list

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