The message timed out in the backlog attempting to send because no connection became available, command=EXISTS, timeout: 5000, outbound: 0KiB, inbound: 0KiB, inst: 0, qu: 12, qs: 0, aw: True, bw: CheckingForTimeoutComplete, rs: ReadAsync, ws: Idle, in: 0, in-pipe: 0, out-pipe: 0, last-in: 196, cur-in: 0, sync-ops: 385806, async-ops: 0, serverEndpoint: 127.0.0.1:6379, conn-sec: 164510.57, aoc: 1, mc: 1/1/0, mgr: 10 of 10 available, clientName: iZbp1evubzt9jztn0xc5tzZ(SE.Redis-v2.7.20.59961), IOCP: (Busy=0,Free=1000,Min=1,Max=1000), WORKER: (Busy=11,Free=32756,Min=4,Max=32767), POOL: (Threads=12,QueuedItems=7,CompletedItems=1802126,Timers=5), v: 2.7.20.59961 (Please take a look at this article for some common client-side issues that can cause timeouts: https://stackexchange.github.io/StackExchange.Redis/Timeouts)