Issue Valid SMB clients will be blocked from accessing the CIFS shares, if there are more than 30 invalid attempts with wrong password from the same client IP address regardless of the user logging in...Issue Valid SMB clients will be blocked from accessing the CIFS shares, if there are more than 30 invalid attempts with wrong password from the same client IP address regardless of the user logging in. This issue will be seen in FSx systems which has NAT configured or in an equivalent setup where all SMB clients mount with the same IP address.