Ask the Community
Groups
Unable to establish protocol connection to local host after update - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="summary"><strong>SUMMARY</strong></h2> <p>Unable to navigate in the UI, receiving the error "Unable to establish protocol connection to local host after update"</p> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p>Unable to navigate in the UI, receiving the error "Unable to establish protocol connection to local host after update"</p> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p>Use an SSH client such as <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Fwww.chiark.greenend.org.uk%2F%7Esgtatham%2Fputty%2Flatest.html">PuTTY</a> to access the Unitrends system at the command line level. <i>Note: Ensure you have the OS password to access the Unitrends system’s command line. The OS </i><a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Funitrends-support.zendesk.com%2Fhc%2Fen-us%2Farticles%2F360013244978">password</a> <i>may differ from the password used to access the User Interface.</i> </p> <ol><li>First, make a copy of your existing hosts file.</li></ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> #cp /etc/hosts /etc/hosts.bak</pre> <ol start="2"><li>Add or correct the localhost entry in the system hosts file using the vim editor. For more details on how to edit using vi, see <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=http%3A%2F%2Fwww.control-escape.com%2Flinux%2Fediting-vim.html">EDITING FILES WITH VI</a>.</li></ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> #vi /etc/hosts</pre> <ol start="3"><li>Find the entry for localhost and edit it such that is exactly mirrors the example below.</li></ol><pre class="code codeBlock" spellcheck="false" tabindex="0"> 127.0.0.1 localhost.localdomain localhost</pre> <div>The UI should not operate normally.</div> <br> </article> </main>