> ⚠️ The commands on this page refer to the Prater testnet. If you're running mainnet, replace `prater` with `mainnet` in the commands below. If you're running `pyrmont` relace `prater` with `pyrmont`.
As it stands, we are continuously making improvements to both stability and memory usage. So please make sure you keep your client up to date! This means restarting your node and updating your software regularly from the `stable` branch. If you can't find a solution to your problem here, feel free to hit us up on our [discord](https://discord.com/invite/XRxWahP)!
> **Note:** While the `stable` branch of the `nimbus-eth2` repository is more stable, the latest updates happen in the `unstable` branch which is (usually) merged into master every week on Tuesday. If you choose to run Nimbus directly from the `unstable` branch, be prepared for instabilities!
If you find that `make update` causes the console to hang for too long, try running `make update V=1` or `make update V=2` instead (these will print a more verbose output to the console which may make it easier to diagnose the problem).
>**Note:** rest assured that when you restart the beacon node, the software will resume from where it left off, using the validator keys you have already imported.
The directory that stores the blockchain data of the testnet is `build/data/prater_shared_0` (if you're connecting to another testnet, replace `prater` with that testnet's name). If you've imported the wrong keys, and wish to start over, delete this repository.
If you’re experiencing sync problems, we recommend running `make clean-prater` to delete the database and restart your sync (make sure you’ve updated to the latest `master` first though).
> **Warning**: `make clean-prater` will erase all of your syncing progress so far, so it should only be used as a last resort -- if your client gets stuck for a long time (because it's unable to find the right chain and/or stay with the same head value) and a normal restart doesn't improve things.
If you're running out of storage, you can [prune](https://blog.ethereum.org/2015/06/26/state-tree-pruning/) the database of unnecessary blocks and states by running:
This will create `nbc_pruned.sqlite3` files in `build/data/shared_prater_0/db`, which you can use in place of the orginal `nbc.sqlite3` files. We recommend you hold onto the originals until you've verified that your validator is behaving as expected with the pruned files.
If you're experiencing a low peer count, you may be behind a firewall. Try restarting your client and passing `--nat:extip:$EXT_IP_ADDRESS` as an option to `./run-prater-beacon-node.sh`, where `$EXT_IP_ADDRESS` is your real IP. For example, if your real IP address is `35.124.65.104`, you'd run:
If you're being flooded with `Catching up on validator duties` messages, then your CPU is probably too slow to run Nimbus. Please check that your setup matches our [system requirements](./hardware.md).
If you cannot start your validator because you are seeing logs that look like the following:
```
WRN 2021-01-08 06:32:46.975+00:00 Local timer is broken or peer's status information is invalid topics="beacnde" tid=120491 file=sync_manager.nim:752 wall_clock_slot=271961 remote_head_slot=271962 local_head_slot=269254 peer=16U*mELUgu index=0 tolerance_value=0 peer_speed=2795.0 peer_score=200
```
This is likely due to the fact that your local clock is off. To compare your local time with a internet time, run:
```
cat </dev/tcp/time.nist.gov/13 ; date -u
```
The first line in the output will give you internet time. And the second line will give you the time according to your machine. These shouldn't be more than a second apart.
If you see an error that looks like the following:
```
{"lvl":"ERR","ts":"2021-05-11 09:05:53.547+00:00","msg":"Eth1 chain monitoring failure, restarting","topics":"eth1","tid":1,"file":"eth1_monitor.nim:1158","err":"Trying to access value with err: Failed to setup web3 connection"}
```
It's because your node can't connect to the web3 provider you have specified. Please double check that you've correctly specified your provider. If you haven't done so already, we recommend [adding a backup](web3-backup.md).
This message is displayed regularly when Nimbus canot detect your correct IP address. It may be a sign that you have a dynamic IP address that keeps changing. Or that Nimbus is unable to get your IP from the [UPnP](https://en.wikipedia.org/wiki/Universal_Plug_and_Play).
The first step is to try relaunching the beacon node with the `--enr-auto-update` option.
If that doesn't fix the problem, double check that your [ports are open](https://www.yougetsignal.com/tools/open-ports/) and that you have [port forwarding](https://www.computerhope.com/issues/ch001201.htm) enabled on your gateway (assuming that you are behind a [NAT](https://en.wikipedia.org/wiki/Network_address_translation)).
See our page on [monitoring the health of your node](./health.md) for more.
We have seen reports of extremely degraded performance when using several types of USB3.0 to SSD adapter or when using native USB3.0 disk drives. [This post](https://www.raspberrypi.org/forums/viewtopic.php?t=245931#p1501426) details why there is a difference in behaviour from models prior to Pi 4 and the recommended workaround.
