Please share configuration of application. If you are using valid port and host then the issue will not appear. I will suggest first configure without tls and port as 5050 for iqservice
Catalog server port as 3268
Auth type simple
Then check if everything is working and then change the port as per need so that you can narrow down the issue.
I have disabled the TLS configuration and tried to connect it without IQService where I’m not able to make port as null in UI Through API I made it null and ran Test Connection. It worked.
Coming to IQService where iam able to copy the certificate from local windows to VA and changed the file name to .PEM and ran the test connection. It worked.