### Description & troubleshooting
I have defined a redis cluster as followed. The cluster consists of 3 masters
(port 6379) and 3 slaves (port 6380).
The password is identical on all nodes through redis option 'requirepass'.
```
modparam("ndb_redis", "server",
"name=sbcredis;addr=SBCMASTERREDISIP;port=6379;db=0;pass=REDACTED")
modparam("ndb_redis", "server",
"name=sbcredis;addr=PRIVATEIP;port=6380;db=0;pass=REDACTED")
modparam("ndb_redis", "server",
"name=sbcredis;addr=ASTP5IP;port=6380;db=0;pass=REDACTED")
modparam("ndb_redis", "server",
"name=sbcredis;addr=ASTP6IP;port=6379;db=0;pass=REDACTED")
modparam("ndb_redis", "server",
"name=sbcredis;addr=ASTP3IP;port=6380;db=0;pass=REDACTED")
modparam("ndb_redis", "server",
"name=sbcredis;addr=ASTP4IP;port=6379;db=0;pass=REDACTED")
modparam("ndb_redis", "cluster", 1)
modparam("ndb_redis", "allow_dynamic_nodes", 1)
modparam("ndb_redis", "debug", 3)
```
When executing the redis_cmd command, most of the times an expected warning is
shown due to another server providing the requested slot:
`"(error) MOVED ... 192.168.136.241:6380"`
Notice that I've enabled "allow_dynamic_nodes" to make sure there is an
automated connection attempt to the indicated server.
However, it appears that sometimes a "NOAUTH Authentication required." error is
thrown when there is a redirection to a slave server serving that slot. I can
authenticate succesfull on the redis-cli when using the identical password
though.
Also note that when a redis master is queried, the redis_cmd is successful.
#### Reproduction
Each simple redis command that needs authentication (GET, SET, ...)
`redis_cmd("sbcredis", "SET TESTKEY TESTVALUE", "r");`
#### Log Messages
```
ndb_redis [redis_client.c:1089]: redisc_exec(): Redis error:NOAUTH
Authentication required.
```
### Possible Solutions
None for now except disabling the password on all nodes.
### Additional Information
```
kamailio 5.7.2
```
--
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https://github.com/kamailio/kamailio/issues/3654
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