varnish-2.0.5 hangs

[Jean-Christophe Petit]

Hello,

we have Varnish-2.0.5 which hangs for some clients
Seems to happen a few minutes after a spike happened.
Most of the clients don't have any problem but some do.
Here is the log we got:

   94 SessionOpen  c 70.26.255.105 50686 :80
   94 ReqStart     c 70.26.255.105 50686 410619754
   94 RxRequest    c GET
   94 RxURL        c /
   94 RxProtocol   c HTTP/1.1
   94 RxHeader     c Host: www.beezid.com
   94 RxHeader     c User-Agent: Mozilla/5.0 (Windows; U; Windows NT 
6.0; en-US; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
   94 RxHeader     c Accept: 
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
   94 RxHeader     c Accept-Language: en-us,en;q=0.5
   94 RxHeader     c Accept-Encoding: gzip,deflate
   94 RxHeader     c Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
   94 RxHeader     c Keep-Alive: 300
   94 RxHeader     c Connection: keep-alive
   94 RxHeader     c Cookie: partner_uid=; 
__utma=253075994.1982649326.1256356542.1260054994.1260109935.52; 
__utmz=253075994.1260109935.52.3.utmcsr=twitter.com|utmccn=(referral)|utmcmd=referral|utmcct=/; 
PHPSESSID=iio7dukkjdkiibvuvkp4cjr8s4; __utmc=253075994; ysm_CK1VFNP4VFSV
   94 VCL_call     c recv
   94 VCL_return   c lookup
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c hash
   94 VCL_return   c hash
   94 VCL_call     c miss
   94 VCL_return   c fetch
   94 Backend      c 13 default default

Is it something to do with the backend not accessible ?

Thanks,

-- 
Jean-Christophe Petit
SYSPARK Inc.