The root cause of this incident has been identified. Our provider performed significant power adjustments on the Bucharest route to compensate for attenuation. Although the Bucharest–Vienna circuit does not run on that segment, the wavelength adjustment caused it to flap briefly, triggering the outage. No further action is required — the circuit has been stable since restoration at 15:20 UTC, and the integrity of redundancy on this route is not at risk.

Between 15:16 UTC and 15:20 UTC, customers experienced a brief service outage due to connectivity disruptions on the backbone link between Bucharest and Vienna. Redundant backup paths were simultaneously affected, resulting in a temporary traffic interruption. Full service was restored within 4 minutes. We are actively working with our third-party infrastructure partners to investigate the cause of the simultaneous path instability and ensure future redundancy resilience.