Re: [Linuxsampler-devel] linuxsampler.org unreachable from IWNET (AS52527, Brazil), possible stale firewall rule

[Christian S. <sch...@li...>]

On Thursday, 16 July 2026 02:55:07 CEST Roger (Outlook) wrote:
> Hi all,

Hi Roger,
 
> First time posting here. I discovered LinuxSampler earlier this year and
> have been really enjoying it with my MIDI keyboard, mostly running piano
> libraries through qsampler. Thanks for keeping this project alive for so
> long.
> 
> The reason I am writing: connections to linuxsampler.org (144.91.83.159)
> from my fixed-line ISP time out on all ports, so I can only reach the
> site through a mobile hotspot or VPN. DNS resolves fine (tested against
> 1.1.1.1 and 9.9.9.9 directly). Traceroute dies after 45.88.191.12,
> inside Contabo's network, one hop from the destination.
> 
> Blocked source: 200.150.252.145 (AS52527, IWNET TELECOM, Sao Paulo,
> Brazil, fixed line). AbuseIPDB shows 0% confidence of abuse for this IP,
> and the range only carries the standard Spamhaus PBL policy listing that
> applies to virtually all residential ranges.

Thanks for pointing this out!

For many months we had AI crawling botnets crawling with such a high bandwidth 
that they were effectively acting like a large distributed DoS. There was no 
other option than automatically blocking subnets of these bots.

The situation is currently stable.

I removed your mentioned subnet from our block list for now.

If the subnet is blocked again, or if anyone else is affected by this, just 
let me know.

Thanks!

/Christian