This issue happened when there are 2 NIC on centos7, 1st is default NAT enp0s3, 2nd is hostonly private network interface enp0s8.
vagrant did "service network restart" via ssh before enable enp0s8, but hanging there so from debug only see "ssh: Sending SSH keep-alive".
I used vagrant 2.0.2 on win7 64bits.
only remedy works for me:
vagrant up --debug
# Restart network
service network restart
(sudo=true)
DEBUG ssh: stderr: 41e57d38-b4f7-4e46-9c38-13873d338b86-vagrant-ssh
DEBUG ssh: Sending SSH keep-alive...
DEBUG ssh: Sending SSH keep-alive...
DEBUG ssh: Sending SSH keep-alive...
DEBUG ssh: Sending SSH keep-alive...--
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