diff --git a/lib/ssh_scan/client.rb b/lib/ssh_scan/client.rb
index ac83c227..9099853d 100644
--- a/lib/ssh_scan/client.rb
+++ b/lib/ssh_scan/client.rb
@@ -70,6 +70,9 @@ def connect()
       rescue Errno::EHOSTUNREACH => e
         @error = SSHScan::Error::ConnectionRefused.new(e.message)
         @sock = nil
+      rescue Errno::ENOPROTOOPT => e
+        @error = SSHScan::Error::ConnectionRefused.new(e.message)
+        @sock = nil
       else
         if @raw_server_banner.nil?
           @error = SSHScan::Error::NoBanner.new(