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The timeout error returns a 504 error code and occurs when either:

  • Horizon has not received a confirmation from the Stellar Core server that the transaction you are trying to submit to the network was included in a ledger in a timely manner, or
  • Horizon has not sent a response to a reverse-proxy before a specified amount of time has elapsed.

The former case may happen because there was no room for your transaction for 3 consecutive ledgers. This is because Stellar Core removes each submitted transaction from a queue. To solve this you can:

  • Keep resubmitting the same transaction (with the same sequence number) and wait until it finally is added to a new ledger, or
  • Increase the fee in order to prioritize the transaction.