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Mattias Geniar
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A while back, Microsoft announced it would ship updates to both its RDP client & server components to resolve a critical security vulnerability. That rollout is now happening and many clients have received auto-updates for their client. As a result, you…
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A small but useful addition to the scoring system of DNS Spy: support for the Null MX record. Internet mail determines the address of a receiving server through the DNS, first by looking for an MX record and then by looking for an A/AAAA record as a…
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All certificates are now required to be logged in publicly available logs (aka “Certificate Transparency”). Since January 2015, Chrome has required that Extended Validation (EV) certificates be CT-compliant in order to receive EV status. In April 2018,…
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The previous 2 Chalk Talk videos were about introducing Varnish and explaining how it works. In this 3rd video, we deep dive into the caching engine of Varnish to explain how you as a developer/webmaster can optimise your content for Varnish, to achieve…
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I’ll be speaking at LOADays next Sunday about Varnish. If you happen to be around, come say hi – I’ll be there all day! Varnish Internals – Speeding up a site x100 In this talk we’ll look at the internals of Varnish, a reverse proxy with powerful caching…
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In the first Chalk Talk video, we looked at what Varnish can do. In this second video, I explain how Varnish does this. As usual, if you like a Dutch written version, have a look at the company blog. Next videos will focus more on the technical internals,…
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I’ll admit I get bitten by the Vary header once every few months. It’s something a lot of CMS’s randomly add, and it has a serious impact on how Varnish handles and treats requests. For instance, here’s a request I was troubleshooting that had these…
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Since Varnish 4.x and later, the default varnishlog output doesn’t show the vcl_hash() data anymore. Your varnishlog will look like this: - VCL_call HASH - VCL_return lookup - Hit 103841868 - VCL_call HIT - VCL_return deliver If you’re debugging, this…
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Patch. now. A remote code execution vulnerability exists within multiple subsystems of Drupal 7.x and 8.x. This potentially allows attackers to exploit multiple attack vectors on a Drupal site, which could result in the site being completely…
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A “blameless” post-mortem after an outage isn’t easy. It takes time to be able to look beyond the person and focus on the what. The important thing at the time was that we cared about what broke, not who broke it. Who broke it is frequently just a roll of…
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