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Cannot access github website via Telstra network. Can access github via 4G on another network. Other websites seem to be working. I noticed that this seems to be a recurring issue with Telstra network for some reason (similar posts in 2015, 2016, 2017, 2018). Any suggestions?
It is normally a DNS propagation issue (ie it fails to propagate to the DNS that your modem is set up to use). Can you change the DNS settings in your modem to change to using 22.214.171.124 (Google's Public DNS) as the DNS server?
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.