I came across a problem that only seems happen on PiAwawre self installs where Dump1090 will not run.

pi@raspberrypi:~ $ sudo piaware-status

dump1090 is not running.
faup1090 is not running.
piaware is running.
no program appears to be listening for connections on port 30005.
faup1090 is NOT connected to port 30005.
piaware is connected to FlightAware.
got 'couldn't open socket: connection refused'
maybe dump1090 is NOT producing data on port 30005.

Troubleshooting steps included the following:

I tried adding the password again maybe I made a mistake but it didn’t fix the problem.

sudo piaware-config -user username -password

I know the my RTL is recognized by Raspbian.

lsusb

Bus 001 Device 011: ID 0cf3:9271 Atheros Communications, Inc. AR9271 802.11n
Bus 001 Device 010: ID 0bda:2832 Realtek Semiconductor Corp. RTL2832U DVB-T
Bus 001 Device 009: ID 05dc:a762 Lexar Media, Inc.
Bus 001 Device 013: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Tried to Restart PiAware.

sudo /etc/init.d/piaware restart

And looked for any helpful output.

cat /tmp/piaware.out

On a forum there was a suggestion about blacklisting a module.

sudo nano /etc/modprobe.d/rtlsdr.conf 

Add the line below to .conf.

blacklist dvb_usb_rtl28xxu

After making the changes reboot abd run the piaware-status command hopefully your output will change.

pi@raspberrypi:~ $ sudo piaware-status
dump1090 is running.
faup1090 is running.
piaware is running.
dump1090 is listening for connections on port 30005.
faup1090 is connected to port 30005.
piaware is connected to FlightAware.
dump1090 is producing data on port 30005.

Links

https://opendesignengine.net/news/53
http://discussions.flightaware.com/ads-b-flight-tracking-f21/help-no-ads-b-data-program-is-serving-port-30005-t35812.html