[Hauke]

In this thread and in the FAQ

Code:

sudo iptables -A INPUT -s 127.0.0.1 -j ACCEPT

is mentioned as an important setting.
At least on my system running on Raspbian Jessie this setting is just kept in memory and therefore gone after a reboot.
(just run

Code:

sudo iptables -L

to see the difference before and after reboot).
To make it permanent I used the iptables-persistent package.

Code:

sudo apt-get install iptables-persistent
sudo iptables -A INPUT -s 127.0.0.1 -j ACCEPT
sudo bash -c "iptables-save > /etc/iptables/rules.v4"

Some of my iptables rules seems to be set by other ways and I end up with several identical rules twice in iptables (once by whatever way and once by /etc/iptables/rules.v4 ). As a non expert I think this should not harm having the same rule several times but to to make sure that I don't get inconsistencies if I change one of them later I removed the other ones out of /etc/iptables/rules.v4 .

I'm still having problems with SSDP errors but nervelessness I think I made a step in the right direction. Now I'll see what else could be the problem....