Ethereum

Wednesday

Polygon (Old)

The Polygon Foundation, the organization that oversees development of the layer-2 scaling network in the Ethereum ecosystem, said on Wednesday that consensus and finality functions have been restored, following a software bug that caused some nodes to fall out of sync with the blockchain.
Polygon successfully executed a hard fork <a href="https://cointelegraph.com/news/polygon-finality-disruption-node-bug" rel="noopener noreferrer nofollow">following the software bug</a> that disrupted some remote procedure call (RPC) nodes, which are used to relay information between applications and the blockchain layer, the Polygon team <a href="https://x.com/0xPolygonFdn/status/1965819439288386009" rel="noopener noreferrer nofollow" target="_blank">said</a> in Wednesday’s update.
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 Source: <a href="https://x.com/0xPolygonFdn/status/1965819439288386009" rel="noopener noreferrer nofollow" target="_blank">Polygon Foundation</a>
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The bug was caused by a “faulty” proposal from a validator, which pushed some of the Bor nodes, used for transaction ordering and block production, onto divergent network forks, according to Polygon co-founder Sandeep Nailwal. Nailwal <a href="https://x.com/sandeepnailwal/status/1965821862358683955" rel="noopener noreferrer nofollow" target="_blank">said</a>:
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 “We rolled out fixes on both Heimdall v0.3.1 — a new version with a hard fork to delete the identified milestone — and Bor 2.2.11 beta2, purging the milestone from the database. With these fixes now live, nodes are not stuck, checkpoints and milestones are finalizing normally.”
</blockquote>
Software bugs <a href="https://cointelegraph.com/news/ton-back-online-after-outage" rel="noopener noreferrer nofollow">continue to cause blockchain outages</a>. As cryptographic protocols become more complex by hosting smart contract functionality, file storage and cross-chain interoperability, bugs may become more frequent, disrupting the onchain user experience.&nbsp;
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 <img alt="Software, Nodes, Polygon" src="https://s3.cointelegraph.com/uploads/2025-09/0199357a-a836-7f06-a3d1-65be2c2983ee" title="">
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 Transactions on Polyscan, the block explorer for Polygon, are displaying properly. Source: <a href="https://polygonscan.com/txs" rel="noopener noreferrer nofollow" target="_blank">Polygon Scan</a>
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Related: <a href="https://cointelegraph.com/news/usdt0-xaut0-stablecoin-launch-polygon" rel="noopener noreferrer nofollow">USDT0 and XAUt0 stablecoins launch on Polygon network</a>
<h2 id="polygon-experiences-second-software-bug-since-july">Polygon experiences second software bug since July</h2>
Wednesday’s software bug did not halt block production on Polygon; instead, the issue impacted node communication, causing a discrepancy between block production and what the impacted nodes were relaying.
Polygon faced a similar issue in July when the Hemidall mainnet, the consensus client that relays communication between nodes for Polygon’s proof-of-stake (PoS) consensus mechanism, was <a href="https://cointelegraph.com/news/polygon-hemidall-v2-mainnet-experiences-temporary-outage" rel="noopener noreferrer nofollow">halted for an hour</a>.
Like Wednesday’s incident, block production on the network never ceased, and new blocks continued to be added to the chain via the Bor mainnet.<iframe width="100%" height="315" src="https://www.youtube.com/embed/1tFg-yG6lPs?start=" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen loading="lazy" sandbox="allow-scripts allow-same-origin allow-popups allow-forms"></iframe>
The consensus layer’s partial outage was due to a validator exiting the network, Polygon spokespeople told Cointelegraph at the time.
Following the unnamed validator’s exit, several RPC nodes had to resynchronize with the blockchain and reestablish communication to resume normal functionality on the layer-2 network.
Magazine: <a href="https://cointelegraph.com/magazine/polygon-anurag-arjun-avail-ethereum-x-hall-of-flame/" rel="noopener noreferrer nofollow">Polygon never set out to beat Ethereum: Anurag Arjun, X Hall of Flame</a>

Polygon fixes RPC node bug, consensus returns to normal

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