Hi all! We're in the process of listing our Marketo integration on the Adobe Exchange Marketplace.
I found this guide but the link to "Learn more here" under Step 6 doesn't work, which makes me think these instructions are outdated.
I'm also getting an error anytime I try to navigate to the Experience Cloud website. See below: 
Hi @aussymac ,
It seems the error size is larger then the set limit.
You can try to increase the header size from Apache using
<VirtualHost *:80>
ServerName site.com
# Increasing the HTTP Request Header Size
LimitRequestFieldSize 16384
Also the configuration needs to be increased in publish AEM instance configMgr for "Header Buffer Size" property in "Apache Felix Jetty Based Http Service”.
Hope it helps!
-Tarun
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