Suddenly no new confirmations on bitcoind

[Mr. Flibble]

I'm using version 40000 of bitcoind and yesterday it stopped receiving new confirmations. Here is the getinfo for it.

Code:

 "version" : 40000,
 "balance" : x,
 "blocks" : 225454,
 "connections" : 8,
 "proxy" : "",
 "generate" : false,
 "genproclimit" : -1,
 "difficulty" : 4367876.00084220,
 "hashespersec" : 0,
 "testnet" : false,
 "keypoololdest" : 1362824413,
 "keypoolsize" : 101,
 "paytxfee" : 0.00000000,
 "errors" : "URGENT: upgrade required, see http://bitcoin.org/dos for details"

My blkindex.dat is currently 7.89GB (split over 5 files) and database log c. 12GB.

What should I do to fix this? I see that it's recommended to upgrade due to a DOS vulnerability but unless I am sure that this is the cause of the problem I don't want to go to the trouble of changing the setup.

[DeathAndTaxes]

wait? version 0.4 wasn't that released in like 2011?  Have you considered upgrading?

Make a backup of your wallet.dat file, leave a copy in the data dir. 
Download and install v0.80
Launch client.  v0.80 uses a new version of the database for storing blockchain but it should be able to build it from the older version (without needing to redownload) it may take up to an hour to build a new copy though.

Once new blockchain is built and synced to current block you should have full access to your funds.

[Mr. Flibble]

Thanks - yes, I realise it is old but I want to leave upgrading as a last option. A service has been built on top of this client and if I upgrade then I will have to do a costly analysis of every change in the way the new version behaves in case it causes and issues with the integration. So an upgrade is a last resort at this point.

Apart from an upgrade, can you (or any other kind person) offer some advise please?

[prezbo]

Code:

 "errors" : "URGENT: upgrade required, see http://bitcoin.org/dos for details"

Enough said.

[Mr. Flibble]

Code:

 "errors" : "URGENT: upgrade required, see http://bitcoin.org/dos for details"

Enough said.

As I mentioned, in my case this is not as simple as it usually would be. So I am seeking advise that doesn't involve an upgrade, or at the very least, ensure that there are no other options available.