- Sui mainnet is back online and processing transactions normally after a temporary network halt.
- User transactions stopped being accepted during an epoch change beginning around 21:18 UTC on May 29.
- Validators remained operational and continued creating system transactions during the disruption.
- A bug linked to randomness initialization and validator restarts prevented the network from completing its transition to the next epoch.
- Validators implemented a fix addressing both the affected epoch and the underlying software issue.
Sui Network, the Layer 1 blockchain developed by Mysten Labs, has restored normal operations after a temporary mainnet disruption that prevented user transactions from being processed during an epoch transition.
Sui mainnet stopped accepting user transactions due to an issue during the epoch change beginning at ~1:30PT. Validators are up and creating system transactions, but user transactions are not currently being accepted. The Sui Core Team is investigating, and updates will be shared…
— Sui (@SuiNetwork) May 29, 2026
The incident began around 21:18 UTC on May 29, when the Sui team reported that the network had stopped accepting user transactions due to an issue encountered during the start of a new epoch. While validators remained online and continued producing system transactions, regular user activity across the network was temporarily halted.
The disruption marked the latest operational challenge for the blockchain, affecting transaction finalization and on-chain activity across decentralized applications running on the network.
Sui Identifies Epoch Transition Failure Behind Network Halt
Sui mainnet is back online and transactions are flowing normally.
The end of epoch halt was triggered during the rollout of yesterday’s long-term fix. As validators restarted to deploy the new binary, the randomness initialization that runs at the start of each epoch was unable…
— Sui (@SuiNetwork) May 30, 2026
In a status update, the Sui team said, “Sui mainnet is back online and transactions are flowing normally.”
According to an update published by the Sui team at approximately 02:32 UTC on May 30, the network halt occurred during the rollout of a long-term fix that validators were deploying through a coordinated software upgrade.
The team explained that as validators restarted to install the new binary, the randomness initialization process that executes at the beginning of each epoch failed to complete. The process requires a higher quorum threshold than Sui’s consensus mechanism.
Sui stated that a previously undiscovered bug in the way that failure state was preserved across validator restarts prevented the network from successfully completing its transition into the next epoch.
The project said validators subsequently deployed a fix addressing both the underlying software bug and the affected epoch, allowing network activity and transaction processing to resume.
Latest Outage Follows January 2026 Network Stall
Earlier during the outage, Sui informed users that the mainnet was experiencing a network stall and that transaction processing could be paused while engineers investigated the issue. Status page updates showed the incident progressing from an active investigation to an identified issue as developers worked on a solution.
Blockchain observers reported that checkpoint and block production activity had stalled during the disruption, preventing new transactions from reaching finality until the fix was implemented.
The latest incident comes several months after a separate network stall in January 2026. According to a post-mortem released by the Sui Foundation at the time, that outage resulted from an internal divergence in validator consensus processing, preventing validators from certifying new checkpoints and causing transaction submissions to fail.
Network operations were restored following a coordinated validator upgrade during the January incident, with the foundation stating that no user funds were at risk and no certified transactions were rolled back.
As Layer 1 blockchain networks compete to support decentralized finance, gaming, and other high-throughput applications, maintaining uninterrupted transaction processing remains a critical operational requirement. The successful restoration of Sui’s mainnet concludes the latest outage, while the forthcoming incident review is expected to provide additional technical details on the failure and remediation process.
