503 errors using Citrix Netscaler

[Naama Bamberger]

We're using Varnish 2.0.1 on our site, with Citrix Netscaler between
Varnish and our Apache Web machines.

We're getting hundreds of sporadic 503 errors an hour.

When I let Varnish round-robin between our web machines, bypassing the
load balancer, the problem disappears.

(We don't want to use this as a permanent solution, though, for failover
and maintenability reasons).

 

Are there any known issues regarding Varnish and Citrix Netscaler?

 

Thanks,

Naama

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