I mine for fun. Please no responses saying "You really shouldn't mine on that computer. At all. Forget mining exists."

Whenever I try to mine using the instructions given in the README of the GUIMiner, it gives me an error as soon as the bitcoin.exe launches as a server.

Here's the error:

Invalid -rpcallowip subnet specification: *. Valid are a single IP (e.g., a network/netmask (e.g. or a network/CIDR (e.g.

  • 1
    So, what value did you specify for -rpcallowip? Does it match one of the listed valid patterns? Jun 2, 2015 at 2:11
  • Shouldn't it be localhost?
    – DSGWubsy
    Jun 2, 2015 at 2:16

2 Answers 2


Try changing it to rpcallowip= Wildcard support was removed from bitcoind, more on reasoning here:


rpcallowip= CIDR notation that is functionally the same as 192.168.1.*.


I had the same problem. What worked for me was opening username/%appdata%/roaming/bitcoin. Then opened bitcoin.config with notepad. I changed rpcallowip=192.168.0.* to rpcallowip=

I'm still very new to all this. This might not be your problem, but that's what I did to remove that error.

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