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Firewall ( SFOS 20 ) block url with 502 bad gateway

Thomas Meier2 8 months ago

Hi there,

we want to open the url: https://procurement.cern.ch and get the error: 502 Bad Gateway.

If I open the URL without our firewall ( at home...) the website will open !

So the problem is our Firewall with SFOS 20.0.0 GA Build 222.

I also tried it with "none" web-policy but I got the same error because I found KB-000035989

Any idea where I can resolve the error?

I also tested the url on ssllabs.com and get A+ ( very good )

many thanks

Thomas

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Thomas Meier2 8 months ago +1 verified

I now have tested the URL without the firewall and connected my PC directly to the WAN. I got the same Error !!! So the problem is our ISP and not the Firewall... Many thanks Thomas

0 rfcat_vk 8 months ago

Hi,

please post your firewall rule that is being used for access to this site. I can access the site without any real issue other than formatting.

Ian

XG115W - v20.0.2 MR-2 - Home

XG on VM 8 - v21 GA

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0 Raphael Alganes 8 months ago

Hello Thomas,

In addition to what Ian has inquired above, I can also access the website using SFv20 GA build 222 on my end.

Could you also share the results of Log Viewer>Web Filter when you try to view the said website? To confirm are you able to follow the steps on the KBA: https://support.sophos.com/support/s/article/KB-000035989?language=en_US

Raphael Alganes
Community Support Engineer | Sophos Technical Support
Sophos Support Videos | Product Documentation | @SophosSupport | Sign up for SMS Alerts
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0 apijnappels 8 months ago

Site opens fine here too (v20)

Managing several Sophos firewalls both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.
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0 PhilippRusch 8 months ago in reply to apijnappels

This Website opens here, too.

Must be a routing problem at your upstream provider.

Mit freundlichem Gruß, best regards from Germany,

Philipp Rusch

New Vision GmbH, Germany
Sophos Silver-Partner

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0 Thomas Meier2 8 months ago in reply to PhilippRusch

Hallo Philipp,
dies denke ich auch so langsam...

Ich habe auch eine neue Firewallregel nur für meinen Computer erstellt ohne Einschränkungen für das Internet und ich bekam den gleichen Fehler.
Was ich nicht testen kann: Firewall vom WAN trennen und meinen PC direkt ans WAN hängen,,,

Ich melde mich wenn der Fehler behoben ist.

Vielen Dank

Thomas Meier
THEVA Dünnschichttechnik GmbH
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0 apijnappels 8 months ago in reply to Thomas Meier2

Are you not able to find something in the logs? Either firewall, Web filter or SSL/TLS inspection logs?

Managing several Sophos firewalls both at work and at some home locations, dedicated to continuously improve IT-security and feeling well helping others with their IT-security challenges.
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+1 Thomas Meier2 8 months ago

I now have tested the URL without the firewall and connected my PC directly to the WAN.

I got the same Error !!!

So the problem is our ISP and not the Firewall...

Many thanks

Thomas
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