io.netty.channel.ConnectTimeoutException only since v3.17.2

[itsmaxwell]

Hello community, I have been working with Redisson for quite some time, and wanted to upgrade to a newer version.
My Redis server version is 6.2.7, and it is working on some other project of mine, hence I can't figure out why I am having these problems.

2023-02-13 12:00:37.135  INFO [,,] 8796 --- [           main] org.redisson.Version                     : Redisson 3.17.2

2023-02-13 12:00:38.701  INFO [,,] 8796 --- [           main] o.r.c.SentinelConnectionManager          : master: redis://192.168.110.92:6379 added

2023-02-13 12:00:38.712  INFO [,,] 8796 --- [           main] o.r.c.SentinelConnectionManager          : slave: redis://192.168.110.67:6379 added

2023-02-13 12:00:38.712  INFO [,,] 8796 --- [           main] o.r.c.SentinelConnectionManager          : slave: redis://192.168.110.73:6379 added

2023-02-13 12:00:38.750  INFO [,,] 8796 --- [sson-netty-2-13] o.r.c.SentinelConnectionManager          : sentinel: redis://213.8.76.4:26379 added

2023-02-13 12:00:48.741 ERROR [,,] 8796 --- [sson-netty-2-14] o.r.c.SentinelConnectionManager          : io.netty.channel.ConnectTimeoutException: connection timed out: 10.42.11.73/_10.42.11.73:26379

10.42.11.73:26379 this is one of our 3 sentinel IP addresses that is failing to connect and redis://213.8.76.4:26379 is the gateway address to the sentinels, any older version is working just fine, am I missing something straightforward?
I really appreciate any help you can provide, thanks a lot.

[mrniko]

3 sentinel IP addresses that is failing to connect

Redisson resolves sentinel hostname to detect ip changes. You can define natMapper to resolve 10.42.11.73 to 213.8.76.4

[itsmaxwell]

I am still struggling with this one :
Is it a configuration property or is it a class I need to implement for it to work?
Could you please kindly add an example please?

• Did version 3.17.2 had any significant connection protocol changes?

[mrniko]

Did version 3.17.2 had any significant connection protocol changes?

No. But it now resolves sentinel hostnames. You can turn it off by sentinelsDiscovery = false setting.

Below is the natMapper usage example.

Config config = new Config(); config.useSentinelServers() .setNatMapper(new NatMapper() { @Override public RedisURI map(RedisURI uri) { if (uri.getHost().equals("10.42.11.73")) { return new RedisURI(uri.getScheme(), "213.8.76.4", uri.getPort()); } return uri; } })