I am having a problem with X2 recently, which has left me unable to import new contacts.
Whenever I attempt to do so, the import never actually begins, and I get a pop up saying:
<!DOCTYPE HTML PUBLIC "-// IETF // DTD HTML 2.0 // EN">
<title>504 Gateway timeout</title>
<p>The gateway did not receive a timely response from the upstream server or application.</p>
I have deleted large files in case it's a space error, and broken up the import file into small files of 1000 contacts.
Still no joy.