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

[Roger (Outlook) <rog...@li...>]

Hi all,

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.

A Brazilian mobile carrier IP reaches the site normally, so this is not 
country-level blocking. My guess is a stale entry covering the IWNET 
range, either in the server firewall or in Contabo's DDoS filtering, but 
from outside I cannot tell which. Happy to run any tests from the 
affected connection if that helps narrow it down.

Thanks,
Roger