Noticed while auditing the code that we aren't respecting (*net.Conn) SetDeadline errors which return after a connection has been killed and is simultaneously being used. For example given program, without SetDeadline error checks ```go package main import ( "log" "net" "time" ) func main() { conn, err := net.Dial("tcp", "tendermint.com:443") if err != nil { log.Fatal(err) } go func() { <-time.After(400 * time.Millisecond) conn.Close() }() for i := 0; i < 5; i++ { if err := conn.SetDeadline(time.Now().Add(time.Duration(10 * time.Second))); err != nil { log.Fatalf("set deadline #%d, err: %v", i, err) } log.Printf("Successfully set deadline #%d", i) <-time.After(150 * time.Millisecond) } } ``` erraneously gives ```shell 2017/11/14 17:46:28 Successfully set deadline #0 2017/11/14 17:46:29 Successfully set deadline #1 2017/11/14 17:46:29 Successfully set deadline #2 2017/11/14 17:46:29 Successfully set deadline #3 2017/11/14 17:46:29 Successfully set deadline #4 ``` However, if we properly fix it to respect that error with ```diff --- wild.go 2017-11-14 17:44:38.000000000 -0700 +++ main.go 2017-11-14 17:45:40.000000000 -0700 @@ -16,7 +16,9 @@ conn.Close() }() for i := 0; i < 5; i++ { - conn.SetDeadline(time.Now().Add(time.Duration(10 * time.Second))) + if err := conn.SetDeadline(time.Now().Add(time.Duration(10 * time.Second))); err != nil { + log.Fatalf("set deadline #%d, err: %v", i, err) + } log.Printf("Successfully set deadline #%d", i) <-time.After(150 * time.Millisecond) } ``` properly catches any problems and gives ```shell $ go run main.go 2017/11/14 17:43:44 Successfully set deadline #0 2017/11/14 17:43:45 Successfully set deadline #1 2017/11/14 17:43:45 Successfully set deadline #2 2017/11/14 17:43:45 set deadline #3, err: set tcp 10.182.253.51:57395: use of closed network connection exit status 1 ```

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