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Trying to setup solo mining using Geth, but every time I try to start mining I get:

X Failed to submit hashrate.
X Dynamic exception type: class jsonprc::JsonRpcException
std::exception::what: Exception -32003 : Client connector error: libcurl error:
7 -> Could not connect to http://127.0.0.1:8545

My blockchain is synchronized. What else could it be?

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I'm assuming that you are using geth to run your Ethereum node, and ethminer to run the mining calculations. And you are running both from the same computer. If this is the case, here are some of the configuration parameters you will need to use:

geth will need to have the --rpc command line option:

geth --rpc --rpcaddr "127.0.0.1" --rpcport "8545" [your additional options]

It is mainly the --rpc option that you need above, as the --rpcaddr and --rpcport options are the default.

In ethminer, you will need the following configuration parameters:

ethminer -F http://127.0.0.1:8545 [your additional options]
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