<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">Hello,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">I configured varnish a few weeks ago and things were running OK. Suddently yesterday it stopped working with the following error:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><h1 style="color:rgb(0,0,0);font-family:"Times New Roman""><i>Error 503 Backend fetch failed</i></h1><p style="color:rgb(0,0,0);font-family:"Times New Roman";font-size:medium"><i>Backend fetch failed</i></p><h3 style="color:rgb(0,0,0);font-family:"Times New Roman""><i>Guru Meditation:</i></h3><p style="color:rgb(0,0,0);font-family:"Times New Roman";font-size:medium"><i>XID: 208396</i></p></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">Here it's the result of varnishlog:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><div class="gmail_default"><i>* << Request >> 65581</i></div><div class="gmail_default"><i>- Begin req 2 rxreq</i></div><div class="gmail_default"><i>- Timestamp Start: 1466080309.362022 0.000000 0.000000</i></div><div class="gmail_default"><i>- Timestamp Req: 1466080309.362022 0.000000 0.000000</i></div><div class="gmail_default"><i>- ReqStart 66.249.64.175 47813</i></div><div class="gmail_default"><i>- ReqMethod GET</i></div><div class="gmail_default"><i>- ReqURL /lajme/c66d2a2515/news.aspx</i></div><div class="gmail_default"><i>- ReqProtocol HTTP/1.1</i></div><div class="gmail_default"><i>- ReqHeader Host: <a href="http://time.ikub.al">time.ikub.al</a></i></div><div class="gmail_default"><i>- ReqHeader Connection: Keep-alive</i></div><div class="gmail_default"><i>- ReqHeader Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8</i></div><div class="gmail_default"><i>- ReqHeader From: googlebot(at)<a href="http://googlebot.com">googlebot.com</a></i></div><div class="gmail_default"><i>- ReqHeader User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1; +<a href="http://www.google.com/bot.html">http://www.google.com/bot.html</a>)</i></div><div class="gmail_default"><i>- ReqHeader Accept-Encoding: gzip,deflate,br</i></div><div class="gmail_default"><i>- ReqHeader If-Modified-Since: Wed, 15 Jun 2016 07:10:05 UTC</i></div><div class="gmail_default"><i>- ReqHeader X-Forwarded-For: 66.249.64.175</i></div><div class="gmail_default"><i>- VCL_call RECV</i></div><div class="gmail_default"><i>- ReqUnset Host: <a href="http://time.ikub.al">time.ikub.al</a></i></div><div class="gmail_default"><i>- ReqHeader Host: <a href="http://time.ikub.al">time.ikub.al</a></i></div><div class="gmail_default"><i>- ReqURL /lajme/c66d2a2515/news.aspx</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- VCL_return hash</i></div><div class="gmail_default"><i>- ReqUnset Accept-Encoding: gzip,deflate,br</i></div><div class="gmail_default"><i>- ReqHeader Accept-Encoding: gzip</i></div><div class="gmail_default"><i>- VCL_call HASH</i></div><div class="gmail_default"><i>- VCL_return lookup</i></div><div class="gmail_default"><i>- Debug "XXXX MISS"</i></div><div class="gmail_default"><i>- VCL_call MISS</i></div><div class="gmail_default"><i>- ReqHeader x-state: MISS</i></div><div class="gmail_default"><i>- VCL_return fetch</i></div><div class="gmail_default"><i>- Link bereq 65582 fetch</i></div><div class="gmail_default"><i>- Timestamp Fetch: 1466080309.362211 0.000190 0.000190</i></div><div class="gmail_default"><i>- RespProtocol HTTP/1.1</i></div><div class="gmail_default"><i>- ^C</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- ReqHeader Cookie:</i></div><div class="gmail_default"><i>- ReqUnset Cookie:</i></div><div class="gmail_default"><i>- VCL_return hash</i></div><div class="gmail_default"><i>- ReqUnset Accept-Encoding: gzip,deflate,br</i></div><div class="gmail_default"><i>- ReqHeader Accept-Encoding: gzip</i></div><div class="gmail_default"><i>- VCL_call HASH</i></div><div class="gmail_default"><i>- VCL_return lookup</i></div><div class="gmail_default"><i>- Debug "XXXX MISS"</i></div><div class="gmail_default"><i>- VCL_call MISS</i></div><div class="gmail_default"><i>- ReqHeader x-state: MISS</i></div><div class="gmail_default"><i>- VCL_return fetch</i></div><div class="gmail_default"><i>- Link bereq 32810 fetch</i></div><div class="gmail_default"><i>- Timestamp Fetch: 1466080311.215487 0.000181 0.000181</i></div><div class="gmail_default"><i><b>- RespProtocol HTTP/1.1</b></i></div><div class="gmail_default"><i><b>- RespStatus 503</b></i></div><div class="gmail_default"><i><b>- RespReason Backend fetch failed</b></i></div><div class="gmail_default"><i>- RespHeader Date: Thu, 16 Jun 2016 12:31:51 GMT</i></div><div class="gmail_default"><i>- RespHeader Server: Varnish</i></div><div class="gmail_default"><i>- RespHeader Content-Type: text/html; charset=utf-8</i></div><div class="gmail_default"><i>- RespHeader Retry-After: 5</i></div><div class="gmail_default"><i>- RespHeader X-Varnish: 32809</i></div><div class="gmail_default"><i>- RespHeader Age: 0</i></div><div class="gmail_default"><i>- RespHeader Via: 1.1 varnish-v4</i></div><div class="gmail_default"><i>- VCL_call DELIVER</i></div><div class="gmail_default"><i>- RespHeader X-Cache: MISS</i></div><div class="gmail_default"><i>- RespHeader X-Cache-Hits: 0</i></div><div class="gmail_default"><i>- RespUnset Server: Varnish</i></div><div class="gmail_default"><i>- RespUnset X-Varnish: 32809</i></div><div class="gmail_default"><i>- RespUnset Via: 1.1 varnish-v4</i></div><div class="gmail_default"><i>- VCL_return deliver</i></div><div class="gmail_default"><i>- Timestamp Process: 1466080311.215512 0.000206 0.000025</i></div><div class="gmail_default"><i>- RespHeader Content-Length: 282</i></div><div class="gmail_default"><i>- Debug "RES_MODE 2"</i></div><div class="gmail_default"><i>- RespHeader Connection: keep-alive</i></div><div class="gmail_default"><i>- Timestamp Resp: 1466080311.215539 0.000233 0.000027</i></div><div class="gmail_default"><i>- Debug "XXX REF 1"</i></div><div class="gmail_default"><i>- ReqAcct 389 0 389 215 282 497</i></div></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">I have tested the same page with:</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default"><b><font color="#0b5394" face="verdana, sans-serif">curl <a href="http://time.ikub.al/lajme/c66d2a2515/news.aspx">time.ikub.al/lajme/c66d2a2515/news.aspx</a></font><br></b></div><div class="gmail_default"><font color="#0b5394" face="verdana, sans-serif"><br></font></div><div class="gmail_default"><font color="#0b5394" face="verdana, sans-serif">and it's working fine. Headers from curl are:</font></div><div class="gmail_default"><font color="#0b5394" face="verdana, sans-serif"><br></font></div><div class="gmail_default"><font color="#0b5394" face="verdana, sans-serif"><div class="gmail_default"><i>* Trying 13.94.212.211...</i></div><div class="gmail_default"><i>* Connected to <a href="http://time.ikub.al">time.ikub.al</a> (13.94.212.211) port 80 (#0)</i></div><div class="gmail_default"><i>> HEAD /lajme/c66d2a2515/news.aspx HTTP/1.1</i></div><div class="gmail_default"><i>> Host: <a href="http://time.ikub.al">time.ikub.al</a></i></div><div class="gmail_default"><i>> User-Agent: curl/7.43.0</i></div><div class="gmail_default"><i>> Accept: */*</i></div><div class="gmail_default"><i>></i></div><div class="gmail_default"><i>< HTTP/1.1 200 OK</i></div><div class="gmail_default"><i>HTTP/1.1 200 OK</i></div><div class="gmail_default"><i>< Cache-Control: private</i></div><div class="gmail_default"><i>Cache-Control: private</i></div><div class="gmail_default"><i>< Content-Length: 93606</i></div><div class="gmail_default"><i>Content-Length: 93606</i></div><div class="gmail_default"><i>< Content-Type: text/html; charset=utf-8</i></div><div class="gmail_default"><i>Content-Type: text/html; charset=utf-8</i></div><div class="gmail_default"><i>< Last-Modified: Fri, 06 Sep 2013 11:50:00 GMT</i></div><div class="gmail_default"><i>Last-Modified: Fri, 06 Sep 2013 11:50:00 GMT</i></div><div class="gmail_default"><i>< Server: Microsoft-IIS/8.5</i></div><div class="gmail_default"><i>Server: Microsoft-IIS/8.5</i></div><div class="gmail_default"><i>< X-AspNet-Version: 2.0.50727</i></div><div class="gmail_default"><i>X-AspNet-Version: 2.0.50727</i></div><div class="gmail_default"><i>< X-Powered-By: <a href="http://ASP.NET">ASP.NET</a></i></div><div class="gmail_default"><i>X-Powered-By: <a href="http://ASP.NET">ASP.NET</a></i></div><div class="gmail_default"><i>< Date: Fri, 17 Jun 2016 15:31:24 GMT</i></div><div class="gmail_default"><i>Date: Fri, 17 Jun 2016 15:31:24 GMT</i></div><div><br></div></font></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">Any idea what may be causing this?</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">Thank you,</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)">Albert</div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:rgb(11,83,148)"><br></div><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div><span style="font-size:small;color:rgb(61,133,198);font-family:"trebuchet ms",sans-serif">Web: </span><a href="http://www.tollkuci.com/" style="font-size:small;font-family:"trebuchet ms",sans-serif" target="_blank">http://www.tollkuci.com</a><br></div><div><span style="color:rgb(61,133,198);font-family:"trebuchet ms",sans-serif;font-size:small">Follow me on: </span><a href="http://www.linkedin.com/in/alberttollkuci" style="font-family:Arial,Verdana,sans-serif;font-size:12px;margin:0px;padding:0px;color:rgb(31,162,225);text-decoration:none" target="_blank"><img alt="" height="24" src="http://www.tollkuci.com/blog/IMAGES%2f2014%2f02%2flinkedin_icon.png.jpgx" width="24" style="margin: 2px; padding: 0px; vertical-align: middle;">LinkedIn</a> <a href="https://plus.google.com/+AlbertTollku%C3%A7i/posts" style="font-family:Arial,Verdana,sans-serif;font-size:12px;margin:0px;padding:0px;color:rgb(31,162,225);text-decoration:none" target="_blank"><img alt="" height="24" src="http://www.tollkuci.com/blog/IMAGES%2f2014%2f02%2fgoogleplus-icon.png.jpgx" width="24" style="margin: 2px; padding: 0px; vertical-align: middle;">Google+</a> <a href="https://www.facebook.com/albert.tollkuci" style="font-family:Arial,Verdana,sans-serif;font-size:12px;margin:0px;padding:0px;color:rgb(31,162,225);text-decoration:none" target="_blank"><img alt="" height="24" src="http://www.tollkuci.com/blog/IMAGES%2f2014%2f02%2fFacebook_Icon.png.jpgx" width="24" style="margin: 2px; padding: 0px; vertical-align: middle;">Facebook</a> <a href="https://twitter.com/AlbertTollkuci" style="font-family:Arial,Verdana,sans-serif;font-size:12px;margin:0px;padding:0px;color:rgb(31,162,225);text-decoration:none" target="_blank"><img alt="" height="24" src="http://www.tollkuci.com/blog/IMAGES%2f2014%2f02%2fTwitterIcon.png.jpgx" width="24" style="margin: 2px; padding: 0px; vertical-align: middle;">Twitter</a> <a href="http://careers.stackoverflow.com/atollkuci" style="font-family:Arial,Verdana,sans-serif;font-size:12px;margin:0px;padding:0px;color:rgb(31,162,225);text-decoration:none" target="_blank"><img alt="" height="24" src="http://www.tollkuci.com/blog/IMAGES%2f2014%2f02%2fcareers-icon.png.jpgx" width="24" style="margin: 2px; padding: 0px; vertical-align: middle;">Career 2.0</a></div><font style="font-family:"trebuchet ms",sans-serif;color:rgb(102,102,102)"><hr style="color:rgb(34,34,34);font-family:Arial,Verdana,sans-serif;font-size:12px"></font></div><br></div></div>
</div>