An outage at the provider nearly halted Solana: 86% of the way to a network failure
On August 12, an infrastructure failure at provider TeraSwitch brought Solana to the brink of halting finalization. Due to routing issues, validators controlling 28.83% of all staked SOL went offline simultaneously. This is an alarming signal: the critical threshold beyond which the network stops confirming transactions is 33.34%. In other words, we were 86% of the way to complete blockchain paralysis.
The incident affected about 90 validators. TeraSwitch's autonomous system (AS20326) holds a colossal market share: 118.9 million SOL, or 27.34% of the network's total stake. At the moment of the failure, 94% of that amount went offline. Fortunately, disaster was avoided: routing was restored in about 33 minutes, and validators came back online. Losses during this time amounted to about 333 SOL in missed rewards—a symbolic sum, but the precedent itself is highly telling.
Infrastructure Concentration—a Ticking Time Bomb
Marinade Finance, which first detected the issue, rightly called it an example of dangerous concentration. The project has already announced a review of limits on validator distribution across autonomous systems and data centers. But the problem runs deeper: as of July 22, TeraSwitch accounted for 27.1% of staked tokens, followed by UAB Cherry Servers (12.7%) and Latitude.sh (11%). Such density of placement with a single operator is a systemic risk that cannot be ignored.
Notably, some major players have already recognized the threat. For example, Coinbase confirmed in its first-quarter report that it distributes its 13 validators through TeraSwitch and another 10 through Latitude, using a backup server in a different location for each. This is the right strategy, but it has not yet become an industry standard.
History already knows similar cases. In November 2022, Hetzner shut down servers hosting Solana nodes, affecting about 40% of validators with 20% of the stake—the network survived then. But the current incident is closer to the red line. Separately, I note: the number of active Solana validators in January 2026 dropped to 800—a low not seen since 2021, compared to a peak of 2,500 in 2023. This means every failure now hits harder, and the network's safety margin is thinning.
My conclusion: Solana has once again demonstrated resilience, but this case is a wake-up call for the entire ecosystem. Decentralization is not just a buzzword but a guarantee of survival. As long as validators huddle with a handful of providers, any power outage or DDoS attack could bring the blockchain to its knees. Investors should pay closer attention to stake distribution, and operators should urgently diversify infrastructure before it's too late.