Error 503 Backend fetch failed - XID: 208396

Albert Tollkuçi albert.tollkuci at gmail.com
Fri Jun 17 17:35:45 CEST 2016


Hello,
I configured varnish a few weeks ago and things were running OK. Suddently
yesterday it stopped working with the following error:
*Error 503 Backend fetch failed*

*Backend fetch failed*
*Guru Meditation:*

*XID: 208396*
Here it's the result of varnishlog:

**   << Request  >> 65581*
*-   Begin          req 2 rxreq*
*-   Timestamp      Start: 1466080309.362022 0.000000 0.000000*
*-   Timestamp      Req: 1466080309.362022 0.000000 0.000000*
*-   ReqStart       66.249.64.175 47813*
*-   ReqMethod      GET*
*-   ReqURL         /lajme/c66d2a2515/news.aspx*
*-   ReqProtocol    HTTP/1.1*
*-   ReqHeader      Host: time.ikub.al <http://time.ikub.al>*
*-   ReqHeader      Connection: Keep-alive*
*-   ReqHeader      Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8*
*-   ReqHeader      From: googlebot(at)googlebot.com <http://googlebot.com>*
*-   ReqHeader      User-Agent: Mozilla/5.0 (compatible; Googlebot/2.1;
+http://www.google.com/bot.html <http://www.google.com/bot.html>)*
*-   ReqHeader      Accept-Encoding: gzip,deflate,br*
*-   ReqHeader      If-Modified-Since: Wed, 15 Jun 2016 07:10:05 UTC*
*-   ReqHeader      X-Forwarded-For: 66.249.64.175*
*-   VCL_call       RECV*
*-   ReqUnset       Host: time.ikub.al <http://time.ikub.al>*
*-   ReqHeader      Host: time.ikub.al <http://time.ikub.al>*
*-   ReqURL         /lajme/c66d2a2515/news.aspx*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   VCL_return     hash*
*-   ReqUnset       Accept-Encoding: gzip,deflate,br*
*-   ReqHeader      Accept-Encoding: gzip*
*-   VCL_call       HASH*
*-   VCL_return     lookup*
*-   Debug          "XXXX MISS"*
*-   VCL_call       MISS*
*-   ReqHeader      x-state: MISS*
*-   VCL_return     fetch*
*-   Link           bereq 65582 fetch*
*-   Timestamp      Fetch: 1466080309.362211 0.000190 0.000190*
*-   RespProtocol   HTTP/1.1*
*- ^C*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   ReqHeader      Cookie:*
*-   ReqUnset       Cookie:*
*-   VCL_return     hash*
*-   ReqUnset       Accept-Encoding: gzip,deflate,br*
*-   ReqHeader      Accept-Encoding: gzip*
*-   VCL_call       HASH*
*-   VCL_return     lookup*
*-   Debug          "XXXX MISS"*
*-   VCL_call       MISS*
*-   ReqHeader      x-state: MISS*
*-   VCL_return     fetch*
*-   Link           bereq 32810 fetch*
*-   Timestamp      Fetch: 1466080311.215487 0.000181 0.000181*
*-   RespProtocol   HTTP/1.1*
*-   RespStatus     503*
*-   RespReason     Backend fetch failed*
*-   RespHeader     Date: Thu, 16 Jun 2016 12:31:51 GMT*
*-   RespHeader     Server: Varnish*
*-   RespHeader     Content-Type: text/html; charset=utf-8*
*-   RespHeader     Retry-After: 5*
*-   RespHeader     X-Varnish: 32809*
*-   RespHeader     Age: 0*
*-   RespHeader     Via: 1.1 varnish-v4*
*-   VCL_call       DELIVER*
*-   RespHeader     X-Cache: MISS*
*-   RespHeader     X-Cache-Hits: 0*
*-   RespUnset      Server: Varnish*
*-   RespUnset      X-Varnish: 32809*
*-   RespUnset      Via: 1.1 varnish-v4*
*-   VCL_return     deliver*
*-   Timestamp      Process: 1466080311.215512 0.000206 0.000025*
*-   RespHeader     Content-Length: 282*
*-   Debug          "RES_MODE 2"*
*-   RespHeader     Connection: keep-alive*
*-   Timestamp      Resp: 1466080311.215539 0.000233 0.000027*
*-   Debug          "XXX REF 1"*
*-   ReqAcct        389 0 389 215 282 497*

I have tested the same page with:


*curl time.ikub.al/lajme/c66d2a2515/news.aspx
<http://time.ikub.al/lajme/c66d2a2515/news.aspx>*

and it's working fine. Headers from curl are:

**   Trying 13.94.212.211...*
** Connected to time.ikub.al <http://time.ikub.al> (13.94.212.211) port 80
(#0)*
*> HEAD /lajme/c66d2a2515/news.aspx HTTP/1.1*
*> Host: time.ikub.al <http://time.ikub.al>*
*> User-Agent: curl/7.43.0*
*> Accept: */**
*>*
*< HTTP/1.1 200 OK*
*HTTP/1.1 200 OK*
*< Cache-Control: private*
*Cache-Control: private*
*< Content-Length: 93606*
*Content-Length: 93606*
*< Content-Type: text/html; charset=utf-8*
*Content-Type: text/html; charset=utf-8*
*< Last-Modified: Fri, 06 Sep 2013 11:50:00 GMT*
*Last-Modified: Fri, 06 Sep 2013 11:50:00 GMT*
*< Server: Microsoft-IIS/8.5*
*Server: Microsoft-IIS/8.5*
*< X-AspNet-Version: 2.0.50727*
*X-AspNet-Version: 2.0.50727*
*< X-Powered-By: ASP.NET <http://ASP.NET>*
*X-Powered-By: ASP.NET <http://ASP.NET>*
*< Date: Fri, 17 Jun 2016 15:31:24 GMT*
*Date: Fri, 17 Jun 2016 15:31:24 GMT*

Any idea what may be causing this?

Thank you,
Albert


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