Can an ftp server block based on OS?

[Isaac]

I've come across an interesting problem. After testing from different machines from different connections, I've come to the conclusion that a godaddy server is blocking everything that's not a Windows OS.

After testing this a variety of ways, with two Windows 10 devices, an Android phone and Linux laptop, all of which connect fine to other ftp servers, I think this godaddy server is blocking non-Windows ftp connections.

Forget logging in for a moment. My goal is just go get a login prompt.

Windows 10 desktop returns: Login Prompt
Windows 10 laptop returns: Login Prompt
MXLinux laptop returns: timeout
Android phone returns: timeout

My current goal is to somehow use one system to spoof a kind of "user agent" for ftp to confirm that this server is blocking non-windows connections. Your thoughts?

[Krom]

Almost all FTP servers lie and say they are unix anyway, especially the windows ones.

Things to check:
Can the devices all see each other when connecting inside the LAN to each others LAN IPs?
If not, do the linux laptop and android have built in firewalls?
If not, is your wifi network partitoned off from the wired network and or isolating clients from each other?
If they can, are you using DHCP reservations or static IPs to set up your port forwarding?
Does your router have some firmware bug that prevents it from forwarding to a wireless client?

[Isaac]

Thanks for your reply. I was starting to check those, however now all bets are off...


Now the server isn't accepting any ftp connections from windows 10 either.

I'm just going to build on a different server then see if it's still broken on Monday

[Isaac]

Update:

Admin disallowed all connections. He switched them back on. I don't know why he switched them off.... "We don't need these" *click*