Fix an issue with incorrectly transferred files via GSConnect

by adding custom iptables rules to your Android firewall app


I’ve recently flashed LingeageOS 18.1 onto my phone. After rooting it, I’ve installed my fav firewall app AFWall+ . But since then I was having problems with sending files to my pc or other phones via (GSConnect app)[]. All sent files had different size than the original file on my phone. I’ve described it in this bug report comment .

After a bit of reading I realised that I have to add some extra iptables rules described in GSConnect’s Wiki ,

Once, I’ve added those rules to AFWall+ then everything started to work as expected.

If you’re having similar issue and you’re using AFWall+ then PLEASE read their tutorial on Loading scripts from files first.

In my case, I’ve created a script called with following rules:

# Necessary at the beginning of each script!
# Open port 1714 to 1764 for GSConnect
$IPTABLES -I "afwall-wifi" -p udp --dport 1714:1764 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPTABLES -I "afwall-wifi" -p tcp --dport 1714:1764 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPTABLES -A "afwall-wifi" -p tcp --sport 1714:1764 -m state --state NEW,ESTABLISHED -j ACCEPT
$IPTABLES -A "afwall-wifi" -p udp --sport 1714:1764 -m state --state NEW,ESTABLISHED -j ACCEPT

Then in the “Set custom script” menu option I specified the path to the script preceded by a dot command:

. /path/to/

After going to airplane mode, I re-applied the firewall rules and turned the airplane mode off.
Since then, I haven’t had any issues with file transfers :)