Research: The lettuce driver runs into an infinite wait because of a netty (https://github.com/netty/netty/issues/3464) bug in 4.0.26.Final (Version of WildFly 9CR1). The timeout is applied correctly but the driver blocks in the closing sequence. This happens in case the host refuses a connection.
netty 4.0.25 and 4.0.27 (and later) work.

WF 9.0.0 and 9.0.1 use both netty 4.0.26. The only solution seems to me is using again own netty jar's for the lettuce driver.

Gunnar Morling wdyt?