Read the statement by Michael Teeuw here.
Can't clone from GitHub
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 @MMRPi1 on the pi, if you have a keyboard can u ssh to itself? ssh pi@localhost works on mine still doesn’t fix the ping problem 
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 @sdetweil I’ll try 
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 @sdetweil Alright so it says ‘the authenticity of localhost cannot be established’ but it lets me in 
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 @MMRPi1 ok, so ssh server is running… 1 thing we know 
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 and I assume you can ping the router route -n 
 Kernel IP routing table
 Destination Gateway Genmask Flags Metric Ref Use Iface
 0.0.0.0 192.168.2.1 0.0.0.0 UG 100 0 0 enp5s0so in my case 192.168.2.1 
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 @sdetweil yes I can ping the router 
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 @MMRPi1 I assume you can ping router from windows ( ipconfig /all, Default Gateway . . . . . . . . . : 192.168.2.1)but can’t ping the pi. is there a firewall on the pi? open a terminal window and do sudo iptables -L
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 @sdetweil Don’t think so, it says ‘policy accept’ on all three entrys 
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 @MMRPi1 weird… didn’t expect it… but u couldn’t access from ios… 
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 @sdetweil I used to be able to about a week ago (both on the PC and iOS). It’s only very recently that it doesn’t let me in 
