Strange behavior with Firewall

[TheNotary]

I have a firewall on a debian machine preventing internet traffic through anything other than the TUN I have set up through openpvp, EXCLUDING local network traffic, so I can still SSH the box and theoretically should be able to access MiniDLNA:

#Allow loopback device (internal communication)
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

#Allow all local traffic.
iptables -A INPUT -s 192.168.1.0/24 -j ACCEPT
iptables -A OUTPUT -d 192.168.1.0/24 -j ACCEPT


#Allow VPN establishment
iptables -A OUTPUT -p udp --dport 1194 -j ACCEPT
iptables -A INPUT -p udp --sport 1194 -j ACCEPT

#Allow traffic to uk and hk PIA server to reconnect VPN in case of failure
iptables -A INPUT -s uk-london.privateinternetaccess.com -j ACCEPT
iptables -A OUTPUT -d uk-london.privateinternetaccess.com -j ACCEPT
iptables -A INPUT -s  hk.privateinternetaccess.com -j ACCEPT
iptables -A OUTPUT -d hk.privateinternetaccess.com -j ACCEPT
#Allow traffic to PIA DNS
iptables -A INPUT -s 209.222.18.222 -j ACCEPT
iptables -A OUTPUT -d 209.222.18.222 -j ACCEPT

#Accept all TUN connections (tun = VPN tunnel)
iptables -A OUTPUT -o tun+ -j ACCEPT
iptables -A INPUT -i tun+ -j ACCEPT

#Set default policies to drop all communication unless specifically allowed
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -P FORWARD DROP

That script works great, I fire it on the servers bootup via /etc/rc.local (it's a debian system). But when I run DLNA that's in the sources.list, I can't connect to the server from other devices. Upon inspection of the logfile, I see something that I can readily make sense of.

[2014/10/18 19:53:29] minissdp.c:335: error: sendto(udp_notify=7, 192.168.1.2): Operation not permitted

I tried compiling but can't get things to work with the init script for some reason. Anyway, does anyone have any suggestions?