This will reset user and password to admin/admin
<div class="gmail_default"><span style="color: #000000; font-family: georgia, serif;">sudo systemctl stop <span class="il">ntopng</span></span></div> <div class="gmail_default"><span style="color: #000000; font-family: georgia, serif;">sudo redis-cli del <span class="il">ntopng</span>.user.admin.<span class="il">password</span></span></div> <div class="gmail_default"><span style="color: #000000; font-family: georgia, serif;">sudo systemctl start <span class="il">ntopng</span></span></div> <div class="gmail_default"></div> <div class="gmail_default"></div>