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Old 2 Weeks Ago
ripe's Avatar
ripe ripe is offline
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Default Can not connect to a website

Hi,

I notice I can not connect to this website: https://www.apec.fr/ with FireFox. I got this error:
Quote:
The connection has timed out

The server at apec.fr is taking too long to respond.

The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer’s network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web.
With a old Sparky Linux I can connect to this website.
Any helps is welcome.

Last edited by ripe; 2 Weeks Ago at 07:13 PM. Reason: apec.fr to https://www.apec.fr/
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Old 2 Weeks Ago
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jggimi jggimi is offline
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At this time of writing:
  • I can resolve the domain name to 91.231.175.100. That address does not respond to pings from here, I cannot establish a TCP connection to port 443, nor port 80, and traceroute(8) ends at 212.73.205.50, which resolves to INTERMEDIAS.edge3.Paris1.Level3.net.
  • https://downforeveryoneorjustme.com/apec.fr says that the server is up, the problem is just me.
  • https://tools.keycdn.com/traceroute testing shows failures to reach the server from 14 locations around the world -- including Paris.
My assumption is the server or its bastion network is using a packet filter, and it happens to use an OS fingerprint filter. PF can do this too, see /etc/pf.os and pf.os(5)

Last edited by jggimi; 2 Weeks Ago at 03:49 AM. Reason: added the fingerprint man page
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Thank you jggimi. I will investigate pf.os man page and /etc/pf.os

Quote:
Originally Posted by jggimi View Post
At this time of writing:
Same as you.
100% packet loss.
traceroute(8) aslo ends at INTERMEDIAS.edge3.Paris1.Level3.net
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I can reach the site with a Windows workstation. So I believe my fingerprint assumption is correct.

I use fingerprint filtering, but only on SSH traffic. I would never use it for a web application.
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I think too as you think. I will write to the website that I could not connect, hoping they will correct it.
Thank you jggimi.
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Old 2 Weeks Ago
J65nko J65nko is offline
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I can connect to https://www.apec.fr/ on FreeBSD 12.0 with Chrome without problem.
__________________
You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump
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Per OpenBSD's /etc/pf.os, our two OSes have different SYN fingerprints:
Code:
65535:64:1:60:M*,N,W1,N,N,T:    FreeBSD:5.0-5.2::FreeBSD 4.7-5.2
.
.
.
16384:64:1:64:M*,N,N,S,N,W6,N,N,T:      OpenBSD:6.1::OpenBSD 6.1
16384:64:0:64:M*,N,N,S,N,W6,N,N,T:      OpenBSD:6.1:no-df:OpenBSD 6.1 (scrub no-df)
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I'm in Germany and it doesn't work for me either on OpenBSD (Firefox, Iridium, Dillo), whereas it works fine on a family member's iMac running MacOS High Sierra.

The frogs are farting in our (OpenBSD user's) general direction, it would seem.

UPDATE: Either they rectified it, or there's a workaround. After connecting to the site from the iMac I can now also connect from my OpenBSD box. Both machines are behind a NAT-Router FWIW.
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Cool!
For me I can't haha
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The effect seems to be temporary! I just tested it again from my OpenBSD box and I couldn't connect anymore. So I openend the page again from the iMac and, voilá, I could again connect from my OpenBSD machine.

As both machines sit behind a non-OpenBSD NAT router the filtering mechanism at apec.fr apparently doesn't perform any further checks on consecutive connections after a successful attempt from the same src-IP. Perhaps the system doesn't recognize OpenBSD as a "known" OS?

Anyway, the page says "La place des compétences cadres". But it's certainly not "La place des compétences numériques"
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I wrote to them about I can not connect from an OpenBSD 6.6. Waiting to know if there is a update from them

Last edited by ripe; 2 Weeks Ago at 08:06 AM.
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