Solana Narrowly Averts Network Halt as 28% of Stake Goes Dark on Teraswitch Outage
Key Takeaways
- •An infrastructure outage at hosting provider Teraswitch caused 28.83% of Solana's staked SOL to drop out of consensus on August 12, coming within approximately 4.5 percentage points of the 33.34% threshold that would have halted block finalization.
- •The disruption affected 90 validators and resulted in 333 SOL in forfeited rewards, with validator operators absorbing the entire loss while stakers faced zero exposure.
- •Solana's second-largest validator, Helius, was offline for the full 33-minute event, and only three of 74 monitored validators recovered cleanly.
- •Teraswitch engineers identified a malformed route within ten minutes of onset and restored service at 04:16:15 UTC after removing the Miami backbone node from its network.
- •The near-miss underscores that infrastructure concentration at shared hosting providers represents a distinct failure vector for proof-of-stake chains that protocol-level improvements like client diversity cannot mitigate.
Solana came within 14 percentage points of a full network halt early on Wednesday, August 12, after 28.83% of the network's staked SOL dropped out of consensus following an infrastructure outage at hosting provider Teraswitch. The episode underscores a lesser-discussed risk in proof-of-stake networks: while protocol engineering and client diversity receive significant attention, validator operators often cluster around the same hosting providers, meaning a single infrastructure-layer failure can rapidly push a chain toward its theoretical stopping point.
The incident, first reported by the Marinade Finance staking protocol, brought the network 86% of the way to the 33.34% delinquency threshold beyond which Solana can no longer finalize blocks. Had the figure crossed that line, it would have ended Solana's 30-month uptime streak and taken the network offline.
How Solana's Consensus Halt Mechanism Works
Solana stops finalizing blocks when more than one-third (33.34%) of all staked SOL goes delinquent. Delinquency occurs when a validator abruptly drops out of the consensus lineup. On August 12, the network peaked at 28.83% delinquent stake before stabilizing.
According to Marinade, the event affected 90 validators, which collectively forfeited 333 SOL in rewards during their downtime. At SOL's trading price of $76.9 at the time of reporting, the entire Solana network could have been temporarily halted by an anomaly worth approximately $25,600.
Despite the near-miss, Solana's official status page continues to report a clean 100% cluster uptime over the preceding 90 days. The network's last full halt occurred on February 6, 2024, and lasted roughly five hours.
Teraswitch Incident and Resolution
Teraswitch's status page provided details of the underlying infrastructure failure:
"Customers at LON1, AMS1, AMS2, AMS3, DUB1, DUB2, FRA2, SGP1, SGP2, TYO1, TYO2 and TYO3 experienced loss of reachability to Internet destinations, as well as to internal Teraswitch backbone destinations between affected sites. Other North American sites were not affected."
Teraswitch reported that it intentionally removed MIA1 (Miami, FL) from its backbone as part of the response. Engineers "identified the malformed route within 10 minutes of onset and removed MIA1 from the backbone to halt further propagation."
Teraswitch confirmed that "affected sites reconverged on their local default routes and service was restored at 04:16:15 UTC."
Marinade noted that the event "barely registered anywhere" despite its severity.
Validator Impact
Of the 74 validators Marinade monitored, only three recovered cleanly: Solana Strategies' laine, Cogent Crypto, and Lion3d. The remainder of the validator pool experienced partial downtime during the episode. Solana's second-largest validator, Helius, was offline for the entire 33-minute disruption.
Regarding the 333 SOL in lost rewards, Marinade stated that validator operators will absorb the loss, leaving stakers with zero exposure.
Solana's Reliability Track Record
Two days before this near-miss, Solana Compass reported that Solana had reached 30 consecutive months without a network-wide outage. The previous outage on February 6, 2024 was traced to a bug in the LoadedPrograms JIT cache that forced validators into repeated recompilation until consensus stalled on a single block. Anza patched the bug, and the chain resumed after approximately five hours.
Solana's improved reliability over 2023 and 2024 has been attributed to three key upgrades: the QUIC transport layer with stake-weighted quality of service to throttle spam traffic, a priority fee market that now accounts for roughly 88% of daily fee revenue, and Firedancer, an independent validator client developed by Jump Crypto that reached mainnet in late 2025. The addition of a second client implementation means that a bug in a single codebase no longer has a path to halting the entire network. However, the Teraswitch near-miss illustrates that infrastructure concentration at shared hosting providers represents a separate failure vector that client diversity alone does not address — a challenge faced by proof-of-stake chains generally, not just Solana.
