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What does the webservers' self defense mechanism do?

The webservers use rate limiting per IP address. It reduces the risk of overload from certain types of attack (so-called DoS attacks) and somewhat badly programmed websites.

Only extreme cases are blocked. When a request is blocked, a HTTP error is provided, either "403 Forbidden" or "503 Service Unavailable".

The limits are handled differently for Web Starter than for greater web hosting packages.


Web Starter

Web Starter uses the Apache module mod_evasive.

The limits per IP address are:

Max page views started per 2 seconds: 10
Max page elements per second: 120
Lock-out period: 10 seconds


Web Medium and greater

Web Medium and greater use Nginx as a reverse proxy and for handling rate limiting.

InnstillingDefaultBurst
POST requests/sec 10 40
POST requests/min 50 200
All requests/sec 100 200
All requests/min 1000 2000
HTTP 1 connections 600 n/a
HTTP 2 connections 6000 n/a

Technically inclined customers may read about how rate limits in Nginx work:


See also:

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