git clone issue with openstack repo

$ sudo tcpdump -i wlan0 port 443 | grep github
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on wlan0, link-type EN10MB (Ethernet), capture size 65535 bytes
19:47:23.758611 IP live.github.com.https > 192.168.1.34.35054: Flags [P.], seq 1223779785:1223779822, ack 3979561406, win 34, options [nop,nop,TS val 854774759 ecr 10639553], length 37
19:47:23.758643 IP 192.168.1.34.35054 > live.github.com.https: Flags [.], ack 37, win 245, options [nop,nop,TS val 10654902 ecr 854774759], length 0
19:47:23.758774 IP 192.168.1.34.35054 > live.github.com.https: Flags [P.], seq 1:75, ack 37, win 245, options [nop,nop,TS val 10654902 ecr 854774759], length 74
19:47:25.107407 IP live.github.com.https > 192.168.1.34.35054: Flags [.], ack 75, win 34, options [nop,nop,TS val 854775037 ecr 10654902], length 0
19:47:33.568142 IP live.github.com.https > 192.168.1.34.39924: Flags [P.], seq 76767093:76767130, ack 2769489221, win 31, options [nop,nop,TS val 854777123 ecr 10641985], length 37
19:47:33.568312 IP 192.168.1.34.39924 > live.github.com.https: Flags [P.], seq 1:75, ack 37, win 245, options [nop,nop,TS val 10657354 ecr 854777123], length 74
19:47:34.449751 IP 192.168.1.34.39924 > live.github.com.https: Flags [P.], seq 1:75, ack 37, win 245, options [nop,nop,TS val 10657575 ecr 854777123], length 74
19:47:34.998780 IP live.github.com.https > 192.168.1.34.39924: Flags [P.], seq 0:37, ack 1, win 31, options [nop,nop,TS val 854777452 ecr 10641985], length 37
19:47:34.998805 IP 192.168.1.34.39924 > live.github.com.https: Flags [.], ack 37, win 245, options [nop,nop,TS val 10657712 ecr 854777452,nop,nop,sack 1 {0:37}], length 0
19:47:35.128262 IP live.github.com.https > 192.168.1.34.39924: Flags [.], ack 75, win 31, options [nop,nop,TS val 854777467 ecr 10657354], length 0
19:47:35.996942 IP live.github.com.https > 192.168.1.34.39924: Flags [.], ack 75, win 31, options [nop,nop,TS val 854777675 ecr 10657575,nop,nop,sack 1 {1:75}], length 0
^C349 packets captured
352 packets received by filter
0 packets dropped by kernel


$ git clone git://git.openstack.org/openstack/openstack-manuals.git
Cloning into 'openstack-manuals'...
fatal: unable to connect to git.openstack.org:
git.openstack.org[0: 2001:4800:7819:103:be76:4eff:fe06:63c]: errno=Network is unreachable

$ git clone https://git.openstack.org/openstack/openstack-manuals
Cloning into 'openstack-manuals'...
fatal: unable to access 'https://git.openstack.org/openstack/openstack-manuals/': Failed to connect to git.openstack.org port 443: Network is unreachable