Ah, I see. But I am using the free versions of your different extentions.
Had no problems for years...
So I must dowmload the free versions for updates from now on?
Milian
1. You have a firewall extension getting in the way
If you have an extension like RS Firewall or AdminTools installed, disable these (temporarily) to see if that is the cause of the issue.
Your host is blocking the connection.
2. It can be that your host is blocking the regularlabs.com domain name or IP address. Or it might be blocking remote url calls altogether. Ask your host if they can see why the page is failing.
The regularlabs.com server is blocking the connection.
3. It can be that there is some block at the host Regular Labs uses. If the above things don't reveal anything, ask your host to perform a traceroute from your server to the download.regularlabs.com domain/IP. And then pass that along to the Regular Labs support via the forum.
Firstly I recommend you do a rebuild of the update sites in Joomla though.
It seems the problem is in the IPv6 connectivity to regularlabs.com
Because an AAAA-record for regularlabs.com exists, that points to 2a02:c206:2139:351::1
My hosts server is configured to prioritize ipv6 traffic, so when it tries to connect to regularlabs.com over ipv6, it times out.
PHP 8.0 has some weird issues with passing around php objects (where it forgets what object it should reference).
Also PHP 8.0 is already end-of-life. So no more support for it.
See:
www.php.net/supported-versions.php