Error-an error is reported when php uses ssh2. InvalidMAC

Warning: ssh2_connect (): ErrorstartingupSSHconnection (-4): Response. phponline10Warning: ssh2_connect (): Response. phponline10Warning: ssh2_auth_password () e... an error occurs.

Warning: ssh2_connect (): Error starting up SSH connection (-4): Invalid MAC received in/var/www/html/ssh. php on line 10
Warning: ssh2_connect (): Unable to connect to 192.168.30.72 in/var/www/html/ssh. php on line 10
Warning: ssh2_auth_password () expects parameter 1 to be resource, boolean given in/var/www/html/ssh. php on line 12 Cannot log in

These errors are reported ..

The code is as follows:
$ Con = ssh2_connect ($ host, '22 ');
If (ssh2_auth_password ($ con, $ user, $ passwd )){
$ Stream = ssh2_exec ($ con, "ls ");
Print $ stream;
} Else print 'cannot log in ';