@Inndie Thank you for reaching out!
First, my apologies as there was a thread that existed previously that addressed this topic but it was archived as a part of our ongoing plan to improve the discussion forums.
That being said, I double checked with our security specialists to confirm that the information there is still accurate.
In this case, Sticky Notes is a third party app managed by Edo-Soft, and it is initiating/handling that connection to ’http://hosting.edo-soft.com/'.
This link was recommended a while ago - I don;t know whether it still works... http://getgui.com/blog/windows/evernote-sticky-notes-error-411-length-required-on-request-activation-link-to-re-authorize-user-account-sync-notes/