It seems to me that this program does not work behind a proxy. 
here the log:
23:25:02	Debug: 	robots.txt added at <https://knetfeder.de>
23:25:02	Debug: 	OK, NOTE: <https://knetfeder.de/> -> /home/karsten/My Web
Sites/Knetfeder/knetfeder.de/index.html
23:25:02	Debug: 	Wait get: <https://knetfeder.de/robots.txt>
23:25:02	Debug: 	resolved: 192.168.1.20
23:25:03	Error: 	"error:00000005:lib(0)::reason(5)" (-5) after 2 retries at
link <https://knetfeder.de/robots.txt> (from primary/primary)
23:25:03	Debug: 	Wait get: <https://knetfeder.de/>

Maybe this problem is caused by a misconfig, but I have no idea what is wrong.