[Development] code.qt.io is undergoing a DDoS attack

Dimitrios Apostolou jimis at qt.io
Tue Nov 11 17:10:23 CET 2025


Hello all,

in the past 48 hours, code.qt.io has been under a persistent DDoS 
attack. The attackers utilize a highly distributed network of IP 
addresses, attempting to obstruct services and network bandwidth.

We have implemented various mechanisms to defend the attack, which 
include load limitations.

Those may lead to "error 503" (resource temporarily unavailable) on the 
HTTP port or "connection refused" on the git port.

While we continue our efforts to eventually defeat the attack, we 
apologize for the service disruption.


Kind regards,

Dimitrios Apostolou,
Axel Spoerl




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