Arbitrum - Notice history

All systems operational

This page covers status and maintenance information for Arbitrum Networks including: Arbitrum One, Arbitrum Nova, Arbitrum Sepolia, and the Stylus Testnet. Arbiscan status updates and details for Arbitrum One and Nova can be found on the official Arbiscan status page, which will include information on planned outages.

For the status of network upgrades (e.g. ArbOS versions), please visit the network upgrades page.

Operational

ARB1 - Sequencer - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

ARB1 - Batch Poster - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

ARB1 - Validator - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

ARB1 - Feed - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

ARB1 - Arbiscan - Operational

97% - uptime
Aug 2025 · 99.97%Sep · 89.65%Oct · 99.98%

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Aug 2025
Sep 2025
Oct 2025
Operational

NOVA - Sequencer - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

NOVA - Batch Poster - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

NOVA - Validator - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

NOVA - Feed - Operational

100% - uptime
Aug 2025 · 100.0%Sep · 100.0%Oct · 100.0%

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Aug 2025
Sep 2025
Oct 2025

NOVA - Arbiscan - Operational

97% - uptime
Aug 2025 · 99.99%Sep · 89.64%Oct · 99.98%

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Aug 2025
Sep 2025
Oct 2025
Operational

SEPOLIA - Sequencer - Operational

99% - uptime
Aug 2025 · 98.80%Sep · 100.0%Oct · 97.96%

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Aug 2025
Sep 2025
Oct 2025

SEPOLIA - Batch Poster - Operational

99% - uptime
Aug 2025 · 98.80%Sep · 100.0%Oct · 97.96%

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Aug 2025
Sep 2025
Oct 2025

SEPOLIA - Validator - Operational

99% - uptime
Aug 2025 · 98.80%Sep · 100.0%Oct · 97.96%

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Aug 2025
Sep 2025
Oct 2025

SEPOLIA - Feed - Operational

99% - uptime
Aug 2025 · 98.80%Sep · 100.0%Oct · 97.96%

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Aug 2025
Sep 2025
Oct 2025

Notice history

Oct 2025

Arbitrum Sepolia Outage
  • Resolved
    Resolved

    Arbitrum Sepolia is back online.

  • Monitoring
    Monitoring

    We've disabled feed signing on Arbitrum Sepolia to bring the network back online while we root cause the issue and work on a fix. Arbitrum Sepolia nodes on 3.7.6 should now be healthy again and properly syncing the chain.

    If you are running an Arbitrum Sepolia node on 3.8.0 (on any rc version), your node will gracefully shut down and so action is required to restart your node with the following flag in order to get your node syncing again with Arbitrum Sepolia.

    --node.feed.input.verify.dangerous.accept-missing


    We will continue our investigation and will cut a new release shortly. Thanks for your understanding and patience.

  • Identified
    Identified

    We've received reports that Arbitrum Sepolia node operators are unable to sync and progress with the chain. We are currently investigating.

  • Update
    Update

    We've identified & resolved a separate issue: After the Ethereum L1 Sepolia Fusaka hard fork, Arbitrum Sepolia had an issue posting batches after block 9409579. This is now resolved, and the batch poster has been posting blocks since block 9409825.

  • Monitoring
    Monitoring

    We've identified the issue: a deviation occurred on Arbitrum Sepolia at block204606366 with nodes running on ARM and x86 reaching different results. Arbitrum Sepolia nodes running on ARM CPU architectures are asked to switch over to servers that use x86 CPU architectures instead. Node's who are synced to Arbitrum Sepolia using x86 architecutres are unimpacted and no action is required at this time.

    Teams who wish to run ARM based nodes can do so once we release a new database snapshot to sync from (coming soon), alongside a new version of Nitro that addresses this fix (also coming soon).

  • Investigating
    Investigating

    We've received alerts and reports from Arbitrum Sepolia node operators relating to their nodes being unable to properly sync the chain. Our team is actively working on a fix and will communicate updates shortly.

NOVA - Arbiscan outage
  • Resolved
    Resolved

    NOVA - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    NOVA - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

Sep 2025

NOVA - Arbiscan outage
  • Resolved
    Resolved

    NOVA - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    NOVA - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

NOVA - Arbiscan outage
  • Resolved
    Resolved

    NOVA - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    NOVA - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

Aug 2025

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

Arbitrum Snapshot explorer frontend offline
  • Resolved
    Resolved
    This incident has been resolved.
  • Identified
    Identified

    We have identified the issue and are continuing to work on a fix for this incident.

  • Investigating
    Investigating

    https://snapshot-explorer.arbitrum.io/ is currently offline. We are currently investigating this incident.

Arbitrum Sepolia Outage
  • Resolved
    Resolved
    This incident has been resolved.
  • Monitoring
    Monitoring
    On August 21st, at around 17:45 ET, Arbitrum Sepolia experienced a brief outage. A fix has since been rolled out to remediate the issue and Arbitrum Sepolia's functionality was restored. Further investigation, monitoring, and post-mortem activities are being conducted. Please inform our team should you encounter any further issues.
  • Investigating
    Investigating

    Arbitrum Sepolia is offline. Our team is investigating.

NOVA - Arbiscan outage
  • Resolved
    Resolved

    NOVA - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    NOVA - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

ARB1 - Arbiscan outage
  • Resolved
    Resolved

    ARB1 - Arbiscan is now operational! This update was created by an automated monitoring service.

  • Investigating
    Investigating

    ARB1 - Arbiscan cannot be accessed at the moment. More details, including information about planned outages, can be found on the Arbiscan status page. This incident was created by an automated monitoring service.

Aug 2025 to Oct 2025

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