description: Frequently asked questions FAQ and answers for troubleshooting Pantheon
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# Troubleshooting
If Pantheon is not working as expected, here are some things to check or try.
## Supplied Genesis Block Does Not Match Stored Chain Data
If you get a `Supplied genesis block does not match stored chain data` error, use the genesis file which matches the genesis block
of the data directory or use the [`--data-path`](../Reference/Pantheon-CLI-Syntax.md#data-path) option to specify a different data directory.
## Host Not Authorized
If you are receiving a `Host not authorized` error when attempting to access the JSON-RPC API, ensure [`--host-whitelist`](../Reference/Pantheon-CLI-Syntax.md#host-whitelist)
includes the host from which you are sending the RPC or `*`.
## Peers Fail to Connect
If nodes are not communicating, ensure the [required ports are open](https://docs.pantheon.pegasys.tech/en/stable/Configuring-Pantheon/Networking/Configuring-Ports/).
If your nodes are running in AWS, check you have appropriate `SecurityGroups` to allow access to the required ports.
Check the [enode URLs](../Configuring-Pantheon/Node-Keys.md#enode-url) specified for [bootnodes](../Configuring-Pantheon/Networking#bootnodes)
or [static nodes](../Configuring-Pantheon/Networking/Managing-Peers.md#static-nodes) match the enode URLs
displayed when the remote nodes are started.
## Mining
Check blocks are being created. On mining nodes, log messages indicate blocks are being created.
```bash
2019-05-08 20:28:27.026+10:00 | pool-10-thread-1 | INFO | IbftRound | Importing block to chain. round=ConsensusRoundIdentifier{Sequence=660, Round=0}, hash=0x759afaba4e923d89175d850ceca4b8ef81f7d9c727b0b0b8e714b624a4b8e8cc
2019-05-08 20:28:29.020+10:00 | pool-10-thread-1 | INFO | IbftRound | Importing block to chain. round=ConsensusRoundIdentifier{Sequence=661, Round=0}, hash=0x5443e504256765f06b3cebfbee82276a034ebcc8d685b7c3d1a6010fd4acfa14
```
On non-mining nodes, log messages indicate blocks are being imported.
```bash
2019-05-08 20:28:29.026+10:00 | EthScheduler-Workers-1 | INFO | BlockPropagationManager | Imported #661 / 0 tx / 0 om / 0 (0.0%) gas / (0x5443e504256765f06b3cebfbee82276a034ebcc8d685b7c3d1a6010fd4acfa14) in 0.000s.
2019-05-08 20:28:31.031+10:00 | EthScheduler-Workers-0 | INFO | BlockPropagationManager | Imported #662 / 0 tx / 0 om / 0 (0.0%) gas / (0x0ead4e20123d3f1433d8dec894fcce386da4049819b24b309963ce7a8a0fcf03) in 0.000s.
If blocks are not being created in [Clique](../Consensus-Protocols/Clique.md#extra-data) or [IBFT 2.0](../Consensus-Protocols/IBFT.md#extra-data) networks,
ensure the validator addresses in the genesis file match running nodes.
## Transactions Not Being Mined
If a transaction is added to the [transaction pool](../Using-Pantheon/Transactions/Transaction-Pool.md)
and the transaction hash returned but the transaction is never being mined, check the [`--min-gas-price`](../Reference/Pantheon-CLI-Syntax.md#min-gas-price)
option on mining nodes. If the `gasPrice` on a [transaction](../Using-Pantheon/Transactions/Transactions.md)
is lower than the `min-gas-price` for the mining node, the transaction will never be mined.
In [free gas networks](../Configuring-Pantheon/FreeGas.md), [`--min-gas-price`](../Reference/Pantheon-CLI-Syntax.md#min-gas-price) must be set to 0.
## Missing Command Line Options
When running Pantheon from the Docker image a number of [command line options are not used](../Getting-Started/Run-Docker-Image.md#command-line-options).
## Genesis Milestone
Not including a sufficient milestone in the genesis file can lead to unexpected and inconsistent behaviour without
specific errors. Ensure a sufficient milestone is included in the genesis file (for example, `constantinoplefixblock`).
## Command Line Options
Characters such as smart quotes and long (em) hyphens won't work in Pantheon command line options. Ensure quotes have
not been automatically converted to smart quotes or double hyphens combined into em hyphens.
## New Line Characters at the End of Files
Ensure there is no new line character (`\n`) at the end of password files. New line characters may not
be displayed in all editors.
## Logging
Restart Pantheon with the command line option [`--logging=TRACE`](../Reference/Pantheon-CLI-Syntax.md#logging) and look at the log files.
