Strange behavior on varnish 5

[Prem Kumar]

Hi All,

 We are 2 behaviors on Varnish 5:

- if we set ttl = 600s , we are seeing HIT is serving the content over 10s
. Origin is not changing the content and we are NOT sending
if_modified_since header.

-   VCL_return     lookup
-   Hit            527698198 *-0.990171<<<<  why it is a hit but ttl is
negative value * 0.000000 0.000000
-   VCL_call       HIT
-   VCL_Log        hit index: 305
-   VCL_Log        x-cache-hit:Buffer
-   VCL_Log        rsp-source:Buffer
-   VCL_Log        x-ingest:false
-   VCL_return     deliver
-   Link           bereq 288421900 bgfetch
-   Timestamp      Fetch: 1526569247.693528 0.000478 0.000478
-   RespProtocol   HTTP/1.1
-   RespStatus     403


- How to disable background fetch ?.

Thanks,
Prem
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