Update - Our techs have now reduced the update frequency down to every 3 hours. We're still seeing an unusually high number of errors from the Microsoft SNDS API.
Dec 10, 2025 - 22:08 UTC
Update - We're still seeing very high 400/500 HTTP error and timeout rates from the Microsoft SNDS API. Our system is currently able to update the SNDS blacklisting data once a day, down from the usual once per hour under normal circumstances. Our tech department is making ongoing efforts to bring this frequency down further. We'll keep you posted here with further updates as we have them.
Dec 09, 2025 - 08:38 UTC
Identified - We're observing a significant increase in API failures when fetching blacklisting data from the Microsoft SNDS platform. They have recently (4 Dec 2025) performed some changes in how their API works, and we believe these errors might be related to that. Our system has been configured for such scenarios and will fallback onto older/stale data if it cannot fetch fresh blacklisting data from the SNDS API. This may cause delayed blacklisting/delisting notices on the Microsoft SNDS blacklists. Unfortunately, this issue is out of our hands, and we hope they'll fix their API soon so our system can resume regular monitoring of the Microsoft SNDS blacklists. In the meantime, we're keeping an eye on the situation as it progresses.
Dec 06, 2025 - 15:11 UTC
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Resolved -
This RBL has become unresponsive for a few days now. We have now removed it from our system. If your IPs or domains were blacklisted here, they will be marked as delisted after the next automatic checkup. We'll reactivate the RBL if/when it comes back online.
Dec 6, 20:17 UTC