update: when I logged in found that I can't withdrawal any cryptocurrency with my Tier 2 verification, but last week it wasn't a problem, now it says you need higher verification level.
When I press withdrawal EUR, got the same error 502 page.
I've seen the "you can't withdraw with Tier 2" message for EUR too. I like Kraken, it's a good system, but it's terribly slow and usually down right when there's anything going on on the market.
Kraken tried to lower the amount of trades by allowing less decimals: for instance 0.1 euro is the smallest you can trade now, but clearly it's not enough.
Each time this happens I tell myself I won't use them again, and each time I do it again anyway. Making a trade takes several tries, getting a deposit address and withdrawing too.
If the site loads at all.
But when it works, my euro withdrawals arrive in my bank account the same day, which is the main reason I still use Kraken.