diff --git a/fhem/FHEM/Blocking.pm b/fhem/FHEM/Blocking.pm
index 4ad0f38e9..d0aa9c393 100644
--- a/fhem/FHEM/Blocking.pm
+++ b/fhem/FHEM/Blocking.pm
@@ -44,6 +44,8 @@ BlockingCall($$@)
       next if(!$h->{TYPE} || $h->{TYPE} ne "telnet" || $h->{SNAME});
       next if($attr{$d}{SSL} || $attr{$d}{password} ||
               AttrVal($d, "allowfrom", "127.0.0.1") ne "127.0.0.1");
+      next if($h->{DEF} !~ m/^\d+( global)?$/);
+      
       next if($h->{DEF} =~ m/IPV6/);
       $telnetDevice = $d;
       last;