Resolved after 28 minutes, affecting FTN (Finland), on November 17, 2025.
We have received the following details from Telia: > Last night we experienced couple of huge denial of service attacks between > > 2025-11-17 20:31:44 EET à 20:43:10 EET > > and also > > 2025-11-17 23:07:44 EET à 23:15:10 EET. > > Our defensing mechanism has probably been the reason for this outage. I will report this to our DDoS team. Sounds like a IP range whitelisting problem to me. As a future guard against this problem, Telia have now explicitly allow-listed our outbound IP addresses.
Affected components
Update timeline
- investigating Nov 17, 2025, 07:56 PM UTC
We have observed issues connecting to Telia who helps power our FTN logins.
- resolved Nov 17, 2025, 08:25 PM UTC
Connection issues to Telia have been resolved. FTN is now operational again.
- postmortem Nov 18, 2025, 09:11 AM UTC
We have received the following details from Telia: > Last night we experienced couple of huge denial of service attacks between > > 2025-11-17 20:31:44 EET à 20:43:10 EET > > and also > > 2025-11-17 23:07:44 EET à 23:15:10 EET. > > Our defensing mechanism has probably been the reason for this outage. I will report this to our DDoS team. Sounds like a IP range whitelisting problem to me. As a future guard against this problem, Telia have now explicitly allow-listed our outbound IP addresses.
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