It seems the tokens generated by phpMyAdmin, Adminer, and other database management tools (SQLBuddy) aren't properly handled with the VCL as it is right now. Since they're being generated on-demand (IIRC), the tokens aren't being updated and when you attempt to log-in, it prevents authorization and you're brought back to the log-in page; effectively preventing you from accessing / using a database management tool inside or outside of WordPress.
I tried modifying the VCL to allow them to pass, though I'm still tinkering with Varnish. Perhaps you know of a way around this? If you install Adminer (by itself, single PHP file), you should be able to replicate this easily. The same applies for Adminer as a WordPress plugin, SQLBuddy, and phpMyAdmin. I've not yet tested others.
It seems the tokens generated by phpMyAdmin, Adminer, and other database management tools (SQLBuddy) aren't properly handled with the VCL as it is right now. Since they're being generated on-demand (IIRC), the tokens aren't being updated and when you attempt to log-in, it prevents authorization and you're brought back to the log-in page; effectively preventing you from accessing / using a database management tool inside or outside of WordPress.
I tried modifying the VCL to allow them to pass, though I'm still tinkering with Varnish. Perhaps you know of a way around this? If you install Adminer (by itself, single PHP file), you should be able to replicate this easily. The same applies for Adminer as a WordPress plugin, SQLBuddy, and phpMyAdmin. I've not yet tested others.