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<h1 class="page">Troubleshooting network problems</h1>
<div class="paragraph">
<p>This section describes how to prevent or resolve issues related to network policies.
Che requires the availability of the WebSocket Secure (WSS) connections.
Secure WebSocket connections improve confidentiality and also reliability because they reduce the risk of interference by bad proxies.</p>
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<div class="ulist">
<div class="title">Prerequisites</div>
<ul>
<li>
<p>The WebSocket Secure (WSS) connections on port 443 must be available on the network. Firewall and proxy may need additional configuration.</p>
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<div class="title">Procedure</div>
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<p>Verify the browser supports the WebSocket protocol. See: <a href="https://www.google.com/search?q=websocket+test">Searching a websocket test</a>.</p>
</li>
<li>
<p>Verify firewalls settings: WebSocket Secure (WSS) connections on port 443 must be available.</p>
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<p>Verify proxy servers settings: The proxy transmits and intercepts WebSocket Secure (WSS) connections on port 443.</p>
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