Bitcoin Forum

  I have a windows 7 pc with Bitcoin QT 11.1 it has been running fine until 2 days ago. I shut down bitcoin, then shut down my pc, re-started all the next day. I have done this before with no problems, it would say 6 hours behind and in about 10 minutes would catch up. This time it says " no block source available" and is now up to 32 hours. It hasn't fixed itself and I don't know what to do. Help, please.

Check your connections. Open Help > Debug Window and tell us how many connections it says.

Hi, it says 8(In: 0/Out: 8)

Thats supposed to be 8(In:0/Out:8)

WTF..... 8 out

Looks like I have no input connections? Have good internet, everything else works.

No in connections is fine. Check the peers tab and make sure that all of the nodes listed there have a ping time and the numbers about their block data is within 1 block of the current head such can be looked up on a block explorer.

Peers ping time 70ms-1089ms, shows 8 of them. Stuck on 35 hours all day

I replaced the wallet.dat file in bitcoin with one from 2 weeks ago, still stuck on 35 hours. Says no block source available, been about 4 hours.

Is the CPU load high? It might be that core has finished downloading the 35 hours, but is still processing the data.

my cpu shows little to no activity, 0-3%. AMD 6100 @4.0ghz. I appreciate your help. I think it's something with this pc. about a month ago a brown out started the problems. After that it would open the wallet and started from the beginning, after 3 hrs or so the pc would blue screen and restart. I replaced the power supply and ram, that fixed the blue screen but wallet would not load. I deleted all the wallet files, reload 11.1 and added a backup wallet.dat file, after a day that fixed it. I decided to shut down the system when I didn't need it which worked for 2 weeks or so until 2 days ago. Not sure what now, but I have another pc with this wallet that did comeplete and is up to date, but I have all my stuff on this one and don't really want to change. Oh, I also earlier today when I ran the other one and it finished, I sent my bitcoins to my other pc with an electrum wallet. I just hate to have to switch out my favorite pc, Guess shit happens...............Thanks

If the machine is in the same network you can rule out that its a network issue.

#1 boot both machines
#2 start core on the machine you know its working, lets call it A
#3 figure out the IP of A. Lets say its 10.0.0.1
#4 let A sync
#5 start core on the machine with the issues (B), but add -connect=10.0.0.1 as a start parameter, e.g. on Windows hit Win + R to open the run menu and enter


Now B will connect to A and only A. If its still not syncing over a LAN its a problem with the machine. If its syncing just fine, it was a problem with the peers you connected to.

I'll give that a shot....post tomorrow, thanks

Since you shut it down, Bitcoin Core might not have shut down completely and could have the database corrupted. I have read that many people had this issue with the No block source. Since network issue is ruled out, I would think that this would most probably be the case. Try to reindex the Blockchain. This may solve your issue if what shorena said didn't work. Open CMD and run: