Dear colleagues, Today, between approximately 6:41 UTC and 10:31 UTC, 503 responses were served for rrdp.ripe.net from multiple CDN edge locations in the United States. When we received a report of this issue at 12:09 UTC, we mitigated potential issues by switching CDN providers before starting our investigation. The CDN in use at the time uses a cache between the origin and edge locations. We expect the issue to be limited to CDN edge locations in Atlanta and Dallas (usatl1-edge1, usatl1-edge2, usdal-edge1, and usdal-edge2). Due to this location, this issue was not visible to us from our monitoring locations in Europe. We monitor that the objects in the RRDP snapshot that each CDN provided caches are in sync with our CA system but do not monitor individual CDN edge locations. However, during an extended outage, relying party instances will fall back to rsync. We did not observe a significant increase in the rate of rsync connections during the outage period. No rsync connections were dropped because of rsync capacity, with a peak of 200 connections and the 15-minute average peaking at 68 connections. Based on this, we expect the impact to have been limited. We are still investigating the exact impact. Please share any information you have on this issue with us via rpki@ripe.net. Kind regards, Ties de Kock