Sorry everyone for the ongoing problems.
This repeats some of what has been said above but I'm trying to summarise the whole situation esp for the benefit of those less savvy.
It is still to do with a cycling forum with which we share a server being the target of a denial of service attack - causing the processor and network to be saturated.
Increasing the power of the processor soon got swallowed up as it just expanded to use all available resource. The attack is coming from thousands of IP addresses so cannot easily be blocked. These likely include bots which have been installed on unsuspecting users PCs and devices - a good reason to make sure your own PC is secure!!
There is a program analysing the log files for anything useful but the files are massive so it is taking a long time.
The firewall has been reconfigured to try to improve it's blocking capability.
And a change has been made to the cycling forum config which ought to divert the traffic, but it will take time for that change to propagate around t'internet.
I was sent some performance graphs showing when the attack begins. the network and processor utilisation is barely visible long the x-axis then the second it hits both go to a fairly consistent 100% usage, meaning you get slow responses and your browser doesn't like that so times them out.
So there 's the explanation for what's happening and how we're trying to address it. I hope it's successful, and that it is a lasting solution but tbh these things are an absolute nightmare to manage even for a really professional IT outfit and it's often difficult to know exactly how it will pan out in the longer term.
Last edited by: smokie on Mon 13 Oct 25 at 23:43
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