Using same wallet in different computers

[mrx]

Now I have a wallet first created on computer A and it has some BTC in it. Then I installed another copy of bitcoin on computer B(both are Windows). I want two of my computers share one wallet, then I don't need to check both computers to get my overall balance.

The problem is when I copied my wallet from computer A to computer B, the client on computer B won't open. It shows the interface then some errors which says "alloc" or something(forget it, can't access computer B now), and then the client exits.

I've tried to copy all files under %appdata%/Bitcoin on computer A to computer B, and the client could start, but after receiving a payment it crashed again with same error.

Are wallets designed to be used on only 1 computer or there is sth wrong with my computers?

my 1st post and I'm not good at English...

[cypherdoc]

Now I have a wallet first created on computer A and it has some BTC in it. Then I installed another copy of bitcoin on computer B(both are Windows). I want two of my computers share one wallet, then I don't need to check both computers to get my overall balance.

The problem is when I copied my wallet from computer A to computer B, the client on computer B won't open. It shows the interface then some errors which says "alloc" or something(forget it, can't access computer B now), and then the client exits.

I've tried to copy all files under %appdata%/Bitcoin on computer A to computer B, and the client could start, but after receiving a payment it crashed again with same error.

Are wallets designed to be used on only 1 computer or there is sth wrong with my computers?

my 1st post and I'm not good at English...

wallet.dat is interchangeable btwn diff computers, even different OS's.   try deleting all files except wallet.dat in Bitcoin folder and restarting client.

[cypherdoc]

Now I have a wallet first created on computer A and it has some BTC in it. Then I installed another copy of bitcoin on computer B(both are Windows). I want two of my computers share one wallet, then I don't need to check both computers to get my overall balance.

The problem is when I copied my wallet from computer A to computer B, the client on computer B won't open. It shows the interface then some errors which says "alloc" or something(forget it, can't access computer B now), and then the client exits.

I've tried to copy all files under %appdata%/Bitcoin on computer A to computer B, and the client could start, but after receiving a payment it crashed again with same error.

Are wallets designed to be used on only 1 computer or there is sth wrong with my computers?

my 1st post and I'm not good at English...

you won't be able to "share" the same wallet.dat btwn 2 computers.  unfortunately ur gonna have to move wallet.dat back and forth btwn them.

[Stephen Gornick]

I want two of my computers share one wallet, then I don't need to check both computers to get my overall balance.

You might want to look into a client that accesses the bitcoin client using RPC:
 
 - http://en.bitcoin.it/wiki/Spesmilo
 or
 - http://en.bitcoin.it/wiki/Bitcoin-js-remote

[mrx]

you won't be able to "share" the same wallet.dat btwn 2 computers.  unfortunately ur gonna have to move wallet.dat back and forth btwn them.

Then I can't use a wallet simultaneously on two computers?

[Stephen Gornick]

Then I can't use a wallet simultaneously on two computers?

 No.
 http://forum.bitcoin.org/index.php?topic=5324.msg77896#msg77896
 http://en.bitcoin.it/wiki/Wallet

[Ivanish]

What about the option of using something like dropbox?

[Stephen Gornick]

What about the option of using something like dropbox?

Though it might work if you can ensure that only one computer will ever run the client at a time, the likely even bigger problem is that for that method to work you would have Dropbox backing up your wallet.dat without encrypting it first.

 http://en.bitcoin.it/wiki/Securing_your_wallet#General_Solutions
 "Your wallet.dat file is not encrypted by BitCoin. Anyone who can access it can easily steal all of your coins"

So again, the answer is no -- do not try to share the same wallet on more than one computer.

[mrx]

What about the option of using something like dropbox?

Though it might work if you can ensure that only one computer will ever run the client at a time, the likely even bigger problem is that for that method to work you would have Dropbox backing up your wallet.dat without encrypting it first.

 http://en.bitcoin.it/wiki/Securing_your_wallet#General_Solutions
 "Your wallet.dat file is not encrypted by BitCoin. Anyone who can access it can easily steal all of your coins"

So again, the answer is no -- do not try to share the same wallet on more than one computer.

Generally I use flash disk and VPN connection to computer B's intranet through password protected share to get two wallets synced.

Now I meet the error again just after receiving mining income.

error info:

EXCEPTION: St9bad_alloc
std::bad_alloc
C:\Progra....(path to exe)\bitcoin.exe in
CMyApp::OnExecptionInMainLoop()

and I cannot start the client.

I'll consider using RPC to access my wallet. Thanks for the explanations!

[mrx]

..and now, bitcoin won't start and keep giving the error above on computer A. Computer B is all right.

I plan to start rpc server on computer A with existing wallet file.

I tried to clear out whole %appdata%\bitcoin, no luck.

How to achieve my goal now?

[mrx]

Shameless bumping.

I really need to get my computer A working with my wallet because computer B is not accessible without VPN and it's less secure because it's public(I'm sure nobody else using com B know what is Bitcoin but it's public. In fact it's in a class).

Still getting St9bad_alloc problem...

[mollari]

Have you tried updating to the latest client version?
https://forum.bitcoin.org/index.php?topic=16553.0

[RaTTuS]

the other way ,
start bitcoin on your secure machine,
get it's payment address,
and issue a payment from the unsecured one to your new address, continue to use the new one for ever