StackExchange.Redis timeout and “No connection is available to service this operation”

Question

I have the following issues in our production environment (Web-Farm - 4 nodes, on top of it Load balancer):

1) Timeout performing HGET key, inst: 3, queue: 29, qu=

Answer 1

It looks like in most cases this exception is a client issue. Previous versions of StackExchange.Redis used Win32 socket directly which sometimes has a negative impact. Probably Asp.net internal routing somehow related to it.
The good news is that StackExchange.Redis's network infra was completely rewritten recently. The last version is 2.0.513. Try it and there is a good chance that your problem will go.