sometimes the scanner connect to check if ssh server running on a port,used
 
curl --connect-timeout 10 -m 50 sftp://localhost:80/
 
if the port not response when received the request packet, the curl client will be pending whitout timeout restrict
 
Solution is patched lib/ssh.c
add
 libssh2_session_set_blocking(sshc->ssh_session, 0);
before
rc = libssh2_session_startup(sshc->ssh_session, sock);

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Received on 2011-05-01