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I've successfully been using Bitcoin core for the past months, but since two weeks ago its synchronisation is always stopped at the exact same blockchain. 2 weeks later, sync is behind by 2 weeks. And the error message is still the same: "No block source available" and I have 0 active connections to Bitcoin network.

I have updated the client, and changed networks (I even tried from another country to tell you the truth). I tried to type in "rescan" and "reindex". EDIT : they worked, but sync is now stopped at another block...

Here is the end of the debug window after I did a rescan :

2016-12-25 21:36:12 Still rescanning. At block 440686. Progress=0.988020

2016-12-25 21:36:53 rescan 821342ms

2016-12-25 21:36:54 mapBlockIndex.size() = 441449

2016-12-25 21:36:54 nBestHeight = 441448

2016-12-25 21:36:54 setKeyPool.size() = 100

2016-12-25 21:36:54 mapWallet.size() = 6

2016-12-25 21:36:54 mapAddressBook.size() = 10

2016-12-25 21:36:54 init message: Chargement des adresses...

2016-12-25 21:36:54 torcontrol thread start

2016-12-25 21:36:54 Loaded 60362 addresses from peers.dat 457ms

2016-12-25 21:36:54 init message: Chargement de la liste d'interdiction...

2016-12-25 21:36:54 init message: Starting network threads...

2016-12-25 21:36:54 AddLocal([2a01:cb00:b1d:1d00:7f:42c7:afca:6f9a]:8333,1)

2016-12-25 21:36:54 Discover: ASUS-PC - 2a01:cb00:b1d:1d00:7f:42c7:afca:6f9a

2016-12-25 21:36:54 AddLocal([2a01:cb00:b1d:1d00:d8e0:fea5:2db:481f]:8333,1)

2016-12-25 21:36:54 Discover: ASUS-PC - 2a01:cb00:b1d:1d00:d8e0:fea5:2db:481f

2016-12-25 21:36:54 dnsseed thread start

2016-12-25 21:36:54 net thread start

2016-12-25 21:36:54 addcon thread start

2016-12-25 21:36:54 opencon thread start

2016-12-25 21:36:54 msghand thread start

2016-12-25 21:36:54 init message: Chargement terminé

2016-12-25 21:36:54 GUI: Platform customization: "windows"

2016-12-25 21:36:54 GUI: PaymentServer::LoadRootCAs: Loaded 44 root certificates

2016-12-25 21:37:05 Loading addresses from DNS seeds (could take a while)

2016-12-25 21:37:05 0 addresses found from DNS seeds

2016-12-25 21:37:05 dnsseed thread exit

Any leads ?

positive.citizen
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  • `-rescan` and `-reindex` are startup parameters. You add them to the startup command of Bitcoin Core, I don't think you can use them from the console. – Murch Dec 20 '16 at 16:12
  • Possible duplicate of [What can I do when the blockchain synchronization is stuck at a specific block?](http://bitcoin.stackexchange.com/q/2979/5406) – Murch Dec 20 '16 at 16:16
  • Possible duplicate of [How to resolve “no block source available”?](http://bitcoin.stackexchange.com/q/12952/5406) – Murch Dec 20 '16 at 16:18
  • OK I'm sorry I'm going to need to ask you how to do "add them to the startup command" exactly... Thanks. – positive.citizen Dec 21 '16 at 04:31
  • See this [description](http://bitcoin.stackexchange.com/a/45997/5406), you'll have to replace `-zapwallettxes` with `-reindex`. – Murch Dec 21 '16 at 08:31
  • Hello, Thanks for the help, but the -reindex command did not work. After a few days of running (reindex is slow...) the sync is now stopped **3** blocs after the one that it stopped before... Any hints ? – positive.citizen Dec 25 '16 at 21:16
  • Does the `debug.log` say anything else besides the previous error message? – Murch Dec 26 '16 at 00:37
  • I added the end of the debug.log in my opening message. Thanks so much for your help. I have 300$ that will be lost if I don't manage to make thi work again... – positive.citizen Dec 26 '16 at 12:01
  • Murch any insight ? Please I'm starting to lose any hope... – positive.citizen Dec 29 '16 at 13:19
  • Is this a recent or old version of Bitcoin Core? What hardware are you running this on? Is it possible that your CPU is overheating? It is possible that either your disk or your computer is making mistakes in the calculation, and then a valid block comes out as invalid and the remainder of the blockchain thus cannot be synchronized. If you just want to get your money out see [Cannot access my bitcoins because my wallet is still synchronising. What can I do to spend them immediately?](http://bitcoin.stackexchange.com/q/6056/5406) – Murch Jan 07 '17 at 16:01
  • Have you tried manually connecting to a specific node (e.g. found on bitcoin nodes)? – Murch Jan 07 '17 at 16:11
  • I've just tried asking around for more suggestions: Are you using a VPN or Tor? – Murch Jan 07 '17 at 16:23
  • Thank you for your help ! I am using Bitcoin Core v0.13.1. I am running this on my laptop (windows 7 flash disk), and my CPU is not overheating. I don't think hardware could be the issue here. I will use your link to access my bitcoins, I will give up on repairing Bitcoin... Best regards ! – positive.citizen Jan 09 '17 at 18:39

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