Zookeeper status is showing OFFLINE in kafka UI, though it is up

[anil9030]

we are using strimzi kafka with AWS .
the zookeeper status in kafka UI is offline, but all zookeeper pods are up and running.

I'm suspecting that there is some issue with certificates because the zookeeper pods are showing logs all the time as below:

2021-12-28 11:39:27,205 ERROR Unsuccessful handshake with session 0x0 (org.apache.zookeeper.server.NettyServerCnxnFactory) [nioEventLoopGroup-7-2]
zookeeper
2021-12-28 11:39:27,205 WARN Exception caught (org.apache.zookeeper.server.NettyServerCnxnFactory) [nioEventLoopGroup-7-2]
zookeeper
io.netty.handler.codec.DecoderException: io.netty.handler.ssl.NotSslRecordException: not an SSL/TLS record: 0000002d000000000000000000000000000075300000000000000000000000100000000000000000000000000000000000
zookeeper
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:471)
zookeeper
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
zookeeper
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
zookeeper
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)

are these both issues inter related? (first issue is zookeper showing offline on kafka UI and the second issue is error logs on zookeeper pods)

[anil9030]

kafka UI:

[scholzj]

We do not support 3rd party application connecting to ZooKeeper. So maybe that is why?

[anil9030]

you mean Kafka UI is being treated as 3rd party application by zookeeper?

[scholzj]

Strimzi does not provide any UI. So yes, from its point of view, whatever UI you are using it is just some application you installed. As I said, we do not expose ZooKeeper in any way for security reasons and because it will be anyway removed soon from Kafka.

[anil9030]

some way can we make that status online? like using zoo entrance which you proposed in other cases?
just want to test it in our dev environment only.

[scholzj]

You can use the zoo-entrance if you want, that is up to you. But I have no idea about what UI are you using (and I would probably not know the UI anyway). So I'm not sure how is it configured or how it works. So I'm not sure if it works with the zoo-entrance or not.