Connection timeout when use ELB with Tomcat

Question

I configured an ELB for HTTPS with imported SSL and registered an instance running Tomcat expose HTTPS port 8443 with the same SSL.

When I use postman to test some APIs with the endpoint is ELP, it sometimes returns Connection timeout after a long time. However, if I use the endpoint is IP of instance, APIs always work and return immediately.

Thanks in advance!

Answer 1

I resolved this problem. LB didn't work stably because I created LB with an AZ and register instances in another AZ. Therefore, I create a new LB with correct AZs and it worked.