<p>Most tiles are returning</p>
<pre><code>HTTP/1.1 504 Gateway Time-out
Server: squid/2.7.STABLE9
Date: Thu, 26 Oct 2017 01:14:35 GMT
Content-Type: text/html
Content-Length: 1619
X-Squid-Error: ERR_CANNOT_FORWARD 11
X-Cache: MISS from longma.openstreetmap.org
X-Cache-Lookup: MISS from longma.openstreetmap.org:3128
Via: 1.0 longma.openstreetmap.org:3128 (squid/2.7.STABLE9)
Connection: close
<html><head>
<meta type="copyright" content="Copyright (C) 1996-2015 The Squid Software Foundation and contributors">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>ERROR: The requested URL could not be retrieved</title>
<style type="text/css"><!--
%l
body
:lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; }
:lang(he) { direction: rtl; }
--></style>
</head><body id="ERR_CANNOT_FORWARD">
<div id="titles">
<h1>ERROR</h1>
<h2>The requested URL could not be retrieved</h2>
</div>
<hr>
<div id="content">
<p>The following error was encountered while trying to retrieve the URL: <a href="http://tile.openstreetmap.org/18/219188/112899.png">http://tile.openstreetmap.org/18/219188/112899.png</a></p>
<blockquote id="error">
<p><b>Unable to forward this request at this time.</b></p>
</blockquote>
<p>This request could not be forwarded to the origin server or to any parent caches.</p>
<p>Some possible problems are:</p>
<ul>
<li id="network-down">An Internet connection needed to access this domains origin servers may be down.</li>
<li id="no-peer">All configured parent caches may be currently unreachable.</li>
<li id="permission-denied">The administrator may not allow this cache to make direct connections to origin servers.</li>
</ul>
<p>Your cache administrator is <a href="mailto:webmaster@openstreetmap.org">webmaster@openstreetmap.org</a>.</p>
<br>
</div>
<hr>
<div id="footer">
<p>Generated Thu, 26 Oct 2017 01:14:35 GMT by longma.openstreetmap.org (squid/2.7.STABLE9)</p>
<!-- ERR_CANNOT_FORWARD -->
</div>
</body></html>
</code></pre>
<p>Can hardly use the website.</p>
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