That is odd, because (www.)duplicati.com is hosted on Digital Ocean, in the same datacenter as updates.duplicati.com.
Yes it’s strange, but updates.duplicati.com are in
inetnum: 46.101.128.0 - 46.101.255.255
netname: EU-DIGITALOCEAN-DE1
descr: Digital Ocean, Inc.
country: DE
and 46.101.128.0 - 46.101.255.255 are banned in our country in most ISP.
And www.duplicati.com are in
NetRange: 139.59.0.0 - 139.59.255.255
CIDR: 139.59.0.0/16
NetName: APNIC-ERX-139-59-0-0
NetHandle: NET-139-59-0-0-1
Parent: NET139 (NET-139-0-0-0-0)
NetType: Early Registrations, Transferred to APNIC
OriginAS:
Organization: Asia Pacific Network Information Centre (APNIC)
139.59.0.0 - 139.59.255.255 are not banned in our country.
I can check any IP is it banned or not on special site.
Thank you!
I am setting up the new server now, can you check if 80.211.6.42 is banned?
No, this IP is not banned.
Thank you!
I have set it up so alt.updates.duplicati.com is a mirror using that IP. I see som traffic already, so I guess that you are not the only one seeing a block on the primary server.
I set the environment variable
AUTOUPDATER_Duplicati_URLS=https://alt.updates.duplicati.com/canary/latest.manifest
Now updates are working fine! 
Thank you very much!
My congratulation with forthcoming New Year!
It should not be required to set the environment variable, as it automatically tries it after failing on the primary url.
But, I just remembered that the download url does not have alternates. This means that you can get the notification, but attempting to install it will fail.
The code needs to change to allow multiple download urls.
Edit: The manifest also has a fallback url embedded, so the download will gracefully try the alternate url as well. I can see that the fallback server is already serving updates, indicating that it works.
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