Issue
Tableau Server is in a degraded state or fails to initialize with the following services in an error state: Cache Server and Tableau Prep Flow AuthoringThe log in "<data directory>\tabsvc\logs\cacheserver\redis_0.log" will show messages similar to the following:
[21236] 08 Sep 13:18:29.764 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
[21236] 08 Sep 13:18:29.764 # Redis version=6.0.11, bits=64, commit=0, modified=0, pid=21236, just started
[21236] 08 Sep 13:18:29.764 # Configuration loaded
[21236] 08 Sep 13:18:29.770 # Could not create server TCP listening socket *:8871: listen: Unknown error
[21236] 08 Sep 13:18:29.764 # Redis version=6.0.11, bits=64, commit=0, modified=0, pid=21236, just started
[21236] 08 Sep 13:18:29.764 # Configuration loaded
[21236] 08 Sep 13:18:29.770 # Could not create server TCP listening socket *:8871: listen: Unknown error