hi @Matthew_Leung !!
Welcome to our community 
!!
First, this is a fairly old version. We strongly suggest you to upgrade to latest as there are a lot of improvements and bug fixes between those versions.
This error message will usually surface when the port (in your case it seems to be 61926) is not properly exposed.
You will need to expose this port in K8s and make sure it is accessible from the application you are connecting from.
Let me know if this helps.
Thanks!