是不是被墙了……
$ ping -c4 github.com PING github.com (192.30.253.112): 56 data bytes Request timeout for icmp_seq 0 Request timeout for icmp_seq 1 Request timeout for icmp_seq 2 --- github.com ping statistics --- 4 packets transmitted, 0 packets received, 100.0% packet loss $ git clone [email protected]:sqlmapproject/sqlmap.git Cloning into 'sqlmap'... ssh: connect to host github.com port 22: Operation timed out fatal: Could not read from remote repository. Please make sure you have the correct access rights and the repository exists. 
