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Why is LastPass issuing requests to my server?
In order to retrieve favicons for sites stored in a LastPass account, to display on your vault, LastPass will periodicly contact the server hostnames in your vault -- the more popular the site the less likely you'd see the request.
Requests should be limited to attempting to find the favicon -- typically a request to the root then to the favicon if listed as a link rel, followed by the favicon, if none is listed /favicon.ico is requested.
If you're still concerned about these requests you can contact security@LastPass.com