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Ethereum Node Needs to Sync Please Wait

Ethereum Node Stuck, Can’t Sync

I’m using a Macbook Pro OS X Version 10.9.5 and am unable to get through the syncing phase. «Ethereum node needs to sync, please wait. » is exactly what is prompt but regardless of the time I wait, it’s unable to sync. I have the option to skip peer search and start the application but it then isn’t synced to my wallet, thus showing 0 Ether in my main account. I downloaded the app 20 days ago and am just getting around to posting for help. Any insight would be greatly appreciated.

3 Answers 3

Download Latest Wallet And Run Packaged Geth

Download the latest Ethereum Wallet from https://github.com/ethereum/mist/releases and install it.

You will find a geth executable in the ./resources/node/geth/ subdirectory under your Ethereum Wallet installation directory. This is the software that connects to peers in the Ethereum network to synchronise the blockchain. Here is the Linux equivalent listing of the Ethereum Wallet directory and geth subdirectory:

Delete your old copy of the blockchain with the command:
From your Ethereum Wallet installation directory, run the command:

You should see something like the following messages (I’m running in Linux):

The last five lines of messages above show that geth is successfully connected to other peers on the Ethereum network and is downloading the blockchain data.

Still Does Not Work — Troubleshooting Connectivity

  • If you still cannot get the blockchain to sync as shown in the previous section, you may have a firewall issue. geth will try to communicate to computers on port 30303 over the Internet.
  • Are you running this from a corporate network or a home network?
  • Are there firewalls in place that prevent communication to raw IP addresses?
  • Are there any restrictions on the ports that can be communicated with?

Here are the initial Ethereum bootnodes that geth will try to initially communicate with (from https://github.com/ethereum/go-ethereum/blob/master/eth/backend.go#L71-L78):

Let’s try communicating with the first bootnode server using the following command. In this case the results show that the connection is successful (the empty reply is because curl does not communicate with the same Discovery protocol as the Ethereum bootnode server):

Here is what it would look like if your network does not allow communication to the Ethereum bootnode server. I’m simulating this condition by providing an incorrect IP address. The Time Spent value just keeps clicking over. You will have to press Control-C to break out of the curl program:

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If you are having the connectivity issues as shown in the previous point, you will need an un-blocked connection to the Internet if you want to synchronise your blockchain to the Ethereum network.

Note: some say that you need an SSD storage for fast writing so that the sync can catch up with the latest block. Personally, I find that HDD storage is alright. However, if given the choice, I would definitely use SSD storage.

To download Geth, go here for Windows users. Then click on the «Geth for Windows» button.

How to sync an Ethereum node without making the mistakes I made

Geth Client for an Ethereum node.

Install Geth (читать далее...)
Nevertheless, I recommend creating a script file to make running Geth and Ethereum Wallet easier.

A few notes

When you’re developing a smart contract, you should sync the testnet first. We will only need to sync the mainnet when we are ready to deploy. Mainnet vs Testnet

Run Geth and Ethereum Wallet
For easy access, I recommend that you create a folder to store the blockchain. For example, «C:\EthereumTestnet».
Note that any third party firewall/anti-virus might limit your connections as well, so make sure to configure it accordingly.

MacOS users

This is user-friendly, but does not enable the RPC services we want to use.

Make sure your port to Geth client is opened

It’s really important to make sure that the connection to your Geth client is not limited. One huge headache I encountered was to let my firewall limit the number of connections I could have through the Geth client.

Depending on your operating system, you will find the chaindata subdirectory in:

Ethereum Wallet Syncing Problems

OS X — HOME Library Ethereum or HOME Library Ethereum geth.

(читать далее…)» style=»fancy» icon=»arrow-circle-1″]You may be encountering some problems syncing Ethereum Wallet (or Mist) to the Mainnet blockchain. A common problem when syncing Ethereum Wallet’s blockchain data is that the syncing slows down between blocks 2, 283, 397 and 2, 620, 384 due to the attack on the Ethereum network (reference Why is my node synchronization stuck/extremely slow at block 2, 306, 843?).

Unable To Sync [ edit ]

You can use Parity and start the Parity syncing using the following command line parameter for a reasonably quick sync: Alternatives [ edit ]

» icon=»icon: bitcoin» icon_color=»#FF5D5D»]Refer to Network Ports, Files And Directories for more information on the location of Ethereum software files and directories on your computer.
If you have a problem with slow syncing, the easiest way to recover from this slowdown is to remove your blockchain data and restart Ethereum Wallet. Ethereum Wallet will then perform a fast sync which skips over these attack blocks.

Slow Syncing Between Blocks 2, 283, 397 And 2, 717, 576 [ edit ]

Change your system settings so that your system clock is synced to an NTP Network Time Protocol server.

Normal Sync In Progress [ edit ]

The following messages are displayed on the `geth —syncmode «fast» console` (pre 1.6.0) screen — note the header(s) and receipt(s):

Before getting into what happens during a sync, it’s important to note that there are three ways to get in sync on Ethereum.

Notes on syncing Ethereum nodes

The goal of nodes is to store and propagate the blockchain.

Understanding the State Trie (читать далее...)
Running an Ethereum node is not necessary for participation with the network; most people probably transact using wallets like MyEtherWallet or Coinbase and simply look at EtherScan to see when their transactions have occurred. This is convenient and probably secure (I’m not a particularly paranoid person) but it’s not in the spirit of cryptocurrency.

Validating Blockchain Headers

The state trie is one of the major technical differences between Ethereum and the Bitcoin blockchain. Understanding it is important to understanding the distinct scaling challenges that Ethereum presents. Syncing the State Trie

Hardware Requirements
These use cases aren’t purely theoretical. Analytical use cases for having historical transactions exist for law enforcement, valuation of tokens, academic research, etc.
The goal of this post is not to get into the state sync too much except to point out that it’s a major obstacle to getting more nodes on the network. My main takeaway from trying to run a Geth node is that the implementation of state sync may not be optimal. This is something I want to dig into more for a future post.

Validating the State Trie

This is convenient and probably secure I m not a particularly paranoid person but it s not in the spirit of cryptocurrency.

Data Availability

So this is the part of the post where it gets a little speculative. I’m sure there are smart people out there who have done a lot more research and thinking about this than me, but I want to try and outline some thoughts I have and hopefully present more detail in future posts.

Ethereum blockchains not synchronized on 3 differents computers

In Geth, this is called gcmode which refers to the concept of garbage collection. Setting it to archive basically turns it off.

Running an Ethereum Node

In Geth, this is called gcmode which refers to the concept of garbage collection.

Archive Nodes (читать далее...)
Pruning is enabled by default, setting it to archive while turning off warp will build all historical data from genesis.

Client Settings

Synchronizes a full node starting at genesis, verifying all blocks and executing all transactions. This mode is much slower than the fast sync mode but comes with increased security.

Client settings
Waits for around 200 seconds before beginning to sync from 2, 300 blocks in the past, then periodically receives small bundles of 1 to 10 blocks. The initial sync takes very little time.
Once the snapshot is restored, the client switches to full sync and ancient blocks are synchronized from the network in background.


To run an archive node, enable full synchronization using —sync-mode FULL, which by default also disables pruning —pruning-enabled false.

Full nodes

A openethereum default node serves the network as a full node after it has finished synchronizing.


  • Stores the header chain and requests everything else on demand.
  • Can verify the validity of the data against the state roots in the block headers.

The default sync mode. Synchronizes a full node doing a fast synchronization by downloading the entire state database, requesting the headers first, and optionally filling in block bodies and receipts. Once the fast sync reaches the best block of the Ethereum network, it switches to full sync mode.

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