Since upgrading to core 155 we have timeout problems when clients connecting to our FTP server.
The FTP server is connected to a public address (running on proftpd).
ftp-connectiosn from inside our office works (listing is immediately) but when establishing a connection from outside our office just trying a listing it takes forever and then the server spits out:
Data connection to xxx.xxx.xxx.xxx:57575 timed out. Falling back to PORT instead of PASV mode.
I tried several things, like:
- proftpd: Using passive mode
- proftpd: disabled DNS lookup etc.
- Added passive ports to ipfire’s iptables with command:
iptables -A INPUT -p tcp -m tcp --dport 49152:65534 -j ACCEPT
- Port forwarding to internal ftp-server
No change…I even installed a second proftpd server with a different Linux distro but same timeout error.
So I wonder if it’s not the remove of ALG for FTP, SIP on the latest 155 which is causing the issue ?
Thank you for your clarification and a possible solution