I haven't started/used my Bitcoin client for ages but now whenever I start the client it is downloading block 135407 and it does not progress past it.

What can I do?

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See bitcoin.stackexchange.com/questions/2914 for some things to try. – Meni Rosenfeld Feb 20 at 9:06
possible duplicate of Stuck Synchronizing? – Chris Moore Feb 20 at 9:40
What version of the client? – Stephen Gornick Feb 20 at 9:46
thanks. I did try things mentioned in the other answers. I posted an answer to this question. @StephenGornick: I am using the latest 0.5.2 client. – Patrick Feb 20 at 10:18
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2 Answers

up vote 2 down vote accepted

Okay, based on the comments I have tried a couple of things but in the end only the following worked:

  1. Close Bitcoin client
  2. Backup files from %APPDATA%\Bitcoin
  3. Optional:Download Block chains from: http://sourceforge.net/projects/bitcoin/files/Bitcoin/blockchain/ to prevent lengthy initial download (Warning: the link advises against doing this if you have transactions in your wallet).
  4. Start Bitcoin client with the -rescan option from command line.

After that the client started downloading blockchains again. This worked for me. Not sure if this will work for everyone.

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You should update your bitcoin software. Old bitcoin versions are not supported.

Look here: https://bitcointalk.org/index.php?topic=55852.0

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It's true that regularly upgrading is encouraged, but all clients since 0.2.10 have supported to switch that happened on Februari 20th. – Pieter Wuille Feb 20 at 16:05
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