[ solved ] syncookies block http(s) traffic for some not all sites

[JL]

Because I've spent extraordinary time on finding out since I don't understand the context (yet)

Enabling syncookies blocks some site but not all, this is particulary so for sites hosted by sucuri.net such as linuxmint.com and reportedly also facebook sites. Which makes one wonder what's the common factor here.

Solution is two-fold. Disable syn cookies are set them to adaptive. When setting to adaptive use a value of start of >= 50% but <100%

Hope this helps.

br,

Joris

[xxup]

Yes, like you I spent hours trying to figure out why farcebook(I don't use this rubbish, but my other half does) and the stock page for new Volkswagens would not work.  It was because I enabled Syncookies without researching them properly first.  The thing that made it hard to diagnose is that these sites cache the pages (or rather the browser did) and at some time later (long after I had forgotten that I had even switched on the setting), when there was some form of forced refresh these pages stopped working for me.  The other thing that happened was that the apt updates on the Ubuntu servers went mind-blowing slow. I blamed the more recent changes and when that didn't work I went back to almost bare build, which was when I noticed the Syncookies setting.

It was a source of considerable anxiety, but also a valuable lesson learned by me, and I hope it saves some other poor soul time when they are trying to figure out network wierdness.

Further research suggests using a 60% 30% setting is the better way to go.