diff --git a/wp-admin/includes/class-wp-filesystem-ssh2.php b/wp-admin/includes/class-wp-filesystem-ssh2.php
index bc978d5141..1b3a3b5964 100644
--- a/wp-admin/includes/class-wp-filesystem-ssh2.php
+++ b/wp-admin/includes/class-wp-filesystem-ssh2.php
@@ -130,7 +130,11 @@ class WP_Filesystem_SSH2 extends WP_Filesystem_Base {
 			}
 		}
 
-		$this->sftp_link = ssh2_sftp($this->link);
+		$this->sftp_link = ssh2_sftp( $this->link );
+		if ( ! $this->sftp_link ) {
+			$this->errors->add( 'connect', sprintf( __( 'Failed to initialize a SFTP subsystem session with the SSH2 Server %1$s:%2$s' ), $this->options['hostname'], $this->options['port'] ) );
+			return false;
+		}
 
 		return true;
 	}
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 77c4015e3e..61ad982cf4 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.4-alpha-34738';
+$wp_version = '4.4-alpha-34739';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.