Cannot synchronize with Bitcoin in testnet mode I downloaded Bitcoin-QT for Windows 7 into:

MYUSERNAME/Downloads/bitcoin-0.8.6-win32/bitcoin-0.8.6-win32


I want to run Bitcoin in testnet mode, so I created bitcoin.conf with only the following content:

testnet=1


I put copies of bitcoin.conf into the following folders:

MYUSERNAME/Downloads/bitcoin-0.8.6-win32/bitcoin-0.8.6-win32
User/MYUSERNAME/AppData/Roaming/Bitcoin


When I double clicked on the Bitcoin-QT icon to execute the following, Bitcoin-QT starts up but it does not appear to be in testnet mode.

MYUSERNAME/Downloads/bitcoin-0.8.6-win32/bitcoin-0.8.6-win32/bitcoin-qt.exe


Can anyone tell me why it does not seem to go into testnet mode?

I went to Start > cmd to get the DOS prompt. I entered the following and it worked:

C:\User\MYUSERNAME\Downloads\bitcoin-0.8.-win32\bitcoin-0.8.6-win32&gt;bitcoin-qt.exe -testnet


Bitcoin-QT launches in testnet mode.  However, it is not synchronizing with the network.  At the bottom, it shows "No block source available...155 weeks behind".

I tried adding the following to bitcoin.conf and restarted bitcoin-qt.exe -testnet but it didn't make any difference.

addnode=1.2.3.4
checklevel=2


After a few hours, it still shows "No block source available...155 weeks behind".  How do I get this to synchronize?
I got it to work by adding
[test]  
addnode=104.237.131.138  
addnode=151.80.205.132  
addnode=192.155.82.123  
addnode=74.220.255.190  

to the config file.
The reason is your wallet needs to connect to nodes to connect to the blockchain. Usually it comes with all the nodes required to connect, but sometimes the devs failed to include the nodes or released a new node list after an update (try looking in the bitcointalk page or the official website listed by the coin developers), so you have to add them manually.