Solana came close to a finality halt on August 12, 2026, after 28.83% of staked SOL went offline. Marinade Finance reported the outage stemmed from a routing failure at infrastructure provider Teraswitch.
The network’s finality threshold sits at 33.34% delinquent stake. Around 90 validators were affected before traffic recovered within roughly 33 minutes, with lost rewards totaling 333 SOL across the affected group.
Teraswitch traced the fault to a default route advertised from its Miami site. The route lost its normal routing attributes during propagation. A route reflector based in Amsterdam then distributed this faulty route to sites across Europe and Asia-Pacific.
Edge routers at twelve affected sites treated the faulty route as a valid local default. They prioritized it over legitimate paths already in place. The core network layer rejected the route as invalid once it reached deeper infrastructure.
This left twelve sites without any valid forwarding path. Locations included London, Amsterdam, Dublin, Frankfurt, Singapore, and Tokyo. North American infrastructure was not affected by the fault.
Teraswitch engineers located the issue within ten minutes of onset. Normal traffic flow resumed by 04:16:15 UTC. The Miami site remains disconnected from the company’s backbone while the root cause is investigated further.
1/ Solana got 86% of the way to a halt this morning and it barely registered anywhere.
28.83% of staked SOL went delinquent. Finality stops at 33.34%.
We added up the rewards lost across all 90 affected validators. 333 SOL. pic.twitter.com/EEC2gYwQgz— Marinade
(@MarinadeFinance) August 12, 2026
AS20326, the autonomous system hosting the affected infrastructure, carries 118.9 million SOL in stake. That figure represents 27.34% of all staked SOL on the network. Roughly 94% of that stake went offline at the same time.
Marinade noted that 14.1 million SOL tied to other providers also went down. These included Latitude.sh, Limestone, Butterfly Research, and Allnodes. The cause of this secondary impact remains unclear from available data.
Recovery data showed 59 validators holding 80.2 million SOL returned within the same short window. This pattern repeated across Amsterdam, Frankfurt, and Tokyo data centers. None of these validators appeared to trigger any failover mechanism during the outage.
Helius, the network’s second-largest validator, stayed offline for the full 33-minute duration. Among 74 validators Marinade could measure, only three recovered cleanly. Those were Laine, Cogent Crypto, and Lion3d.
Marinade pointed to a specific rule under the Solana Foundation Delegation Program. That policy caps any single autonomous system at 25% of the total network stake. AS20326’s current share of 27.34% already exceeds that limit.
Marinade also disclosed concentration figures within its own stake pool. Four autonomous systems hold two-thirds of the stake allocated through its SAM mechanism. One system, AS395201, accounts for 36.94% of that allocation alone.
In response, Marinade said it will review concentration limits by autonomous system and by physical data center. The firm also plans to publish which validators run hot-swap and automatic failover setups, information not currently visible externally.
The 333 SOL in lost rewards will be covered through validator bonds at the next epoch. Marinade warned that a delinquency rate past one-third would have stopped all network finality. It cited the February 2024 halt, which took about five hours to restore.
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