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That's weird! After hours of debugging, I figured that using org.apache.http.client.HttpClient to call another endpoint somehow timeout after couple requests. I changed to RestTemplate and it seems to resolve the issues. I still don't know about the root cause though.
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After couple of debugs, I figured that there's probably nothing wrong with the routing between 2 ELBs. The server2 has logics to send multiple messages to SNS topic. 1 Message is fine, but the 2nd message got timeout and somehow after that, the server1 can't call the server2 again and keep timeout until I restarted both server. So there's probably something wrong with sending multiple SNS messages in 1 API.
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