Galaxy S4 filtering incoming connections I am trying to run an ftp server app on my galaxy s4 (tmobile) and it starts ok, binds to the wifi address and port 8021, but then I can't connect to it. I tried pinging my internal ip address as well and it's not responding. I also tried running nmap on it and it says All 1000 scanned ports on 192.168.1.102 are filtered. I haven't been able to find any settings or anything - any idea what could be blocking the ports? I have checked the IP both via a ip info sort of app, as well as through my router's connected devices page. Any ideas?

Update: I just tried a different FTP app just to make sure and same thing. 

Update: Here's my nmap output:

$ nmap 192.168.1.102 -Pn -p 8021

Starting Nmap 6.00 ( http://nmap.org ) at 2013-06-08 17:21 EDT
Nmap scan report for 192.168.1.102
Host is up.
PORT     STATE    SERVICE
8021/tcp filtered ftp-proxy

$ nmap 192.168.1.102 -Pn

Starting Nmap 6.00 ( http://nmap.org ) at 2013-06-08 17:23 EDT
Nmap scan report for 192.168.1.102
Host is up (0.066s latency).
All 1000 scanned ports on 192.168.1.102 are filtered

Nmap done: 1 IP address (1 host up) scanned in 14.77 seco


I am trying to connect to the phone from my windows box via filezilla and running the nmap from my raspberry pi, again on the same wifi network.

I also checked the router's connected devices and the IP address there matches what the phone shows.

Thanks!
This turned out to be a problem with my router - earlier today I also noticed that I couldn't connect to my printer either - it seems like the router had gotten in a weird AP isolation mode or something like that somehow - I rebooted it and I can connect to the S4 as expected now.