Varnish return 503

[Dang Tung]

Dear all,

We get 503 page when using varnish 2.1.4, when I check log I see this line:
FetchError   - http first read error: -1 11 (Resource temporarily
unavailable)

Do you have any ideas, please have.

I also attach my configure.

-- 
Nguyen Dang Tung
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