Wordpress and error 503 backend fetch failed

[Ayberk Kimsesiz]

Hi,

We are having serious problems with Varnish.
The system was running smoothly for months but now gives the following
errors

Pages are either completely not loading or while they are loading it takes
5-6 seconds to load especially .jpg files.


​

Varnishlog:

   BereqHeader    Accept-Language: en-us,en
-   BereqHeader    Accept-Charset: iso-8859-1,*,utf-8
-   BereqHeader    X-Actual-IP: 85.103.145.67
-   BereqHeader    X-Forwarded-For: 85.103.145.67, 85.103.145.67
-   BereqHeader    Accept-Encoding: gzip
-   BereqHeader    X-Varnish: 1147158
-   VCL_call       BACKEND_FETCH
-   VCL_return     fetch
-   BackendOpen    31 boot.default 176.53.126.10 8080 176.53.126.10 56062
-   BackendStart   176.53.126.10 8080
-   Timestamp      Bereq: 1477043059.209814 0.000116 0.000116
-   FetchError     http first read error: EOF
-   BackendClose   31 boot.default
-   Timestamp      Beresp: 1477043119.209551 59.999853 59.999737
-   Timestamp      Error: 1477043119.209561 59.999863 0.000010
-   BerespProtocol HTTP/1.1
-   BerespStatus   503
-   BerespReason   Service Unavailable
-   BerespReason   Backend fetch failed
-   BerespHeader   Date: Fri, 21 Oct 2016 09:45:19 GMT
-   BerespHeader   Server: Varnish
-   VCL_call       BACKEND_ERROR
-   BerespHeader   Content-Type: text/html; charset=utf-8
-   BerespHeader   Retry-After: 5
-   VCL_return     deliver
-   Storage        malloc Transient
-   ObjProtocol    HTTP/1.1
-   ObjStatus      503
-   ObjReason      Backend fetch failed
-   ObjHeader      Date: Fri, 21 Oct 2016 09:45:19 GMT
-   ObjHeader      Server: Varnish
-   ObjHeader      Content-Type: text/html; charset=utf-8
-   ObjHeader      Retry-After: 5
-   Length         284
-   BereqAcct      519 0 519 0 0 0
-   End

*   << Session  >> 6717525
-   Begin          sess 0 HTTP/1
-   SessOpen       193.86.18.178 59638 :80 176.53.126.10 80
1477043113.589802 45
-   Link           req 6717526 rxreq
-   Link           req 33158 rxreq
-   Link           req 6717528 rxreq
-   Link           req 6717529 rxreq
-   Link           req 6717530 rxreq
-   Link           req 6225952 rxreq
-   Link           req 6717532 rxreq
-   Link           req 33165 rxreq
-   Link           req 33167 rxreq
-   Link           req 6717535 rxreq
-   Link           req 3014918 rxreq
-   Link           req 6717538 rxreq
-   Link           req 6717539 rxreq
-   Link           req 6225957 rxreq
-   Link           req 6225958 rxreq
-   Link           req 6717542 rxreq
-   SessClose      RX_TIMEOUT 6.679
-   End
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