Have you tried to access https://repos.loraserver.io from a different machine, or from your browser? Getting an operation timed out is usually not related to missing files and is usually related to firewalls etc…
Thanks for your quick reply. I just tried the browser (at the same machine). It is amazing that both Release files (in loraserver and skype) can be fetched by my chrome. This PC is new installed as an ubuntu machine, I have not touched any firewall stuff.
On the other hand, I realized another strange phenomenon. When I fetched it from loraserver.io, this file would be saved as a file. However, the file from skype.com would directly be shown in the browser (it is a text file.)
I just verified another machine, it can wget files from loraserver.io. I think you are right – it is a firewall issue. I will check the default firewall setting and will share what I get here. Thanks!
I just realized that the firewall is setting by my ISP (Internet service provider). It blocks data from loraserver.io. I will complain this with them. Thanks for your time and attentsion.