Inquiry Regarding Outgoing Connection Timeout on AWS EC2 Instances

Question

Dear AWS Support Team,

I hope this message finds you well. I am writing to seek clarification and assistance with a networking issue I am encountering on an AWS EC2 instance. I have a Spring Boot application running on an AWS instance, and this application is making a REST API call to an external service on the internet using the OkHttp Client. The external service typically takes around 14 minutes to respond.

I have configured the maximum timeout for this API call to 13 minutes, 14 minutes, and even extended it to 20 minutes in my code. However, when I initiate the API call from my application, it seems to be stuck in a waiting state for the configured timeout duration but does not receive a response from the external service. Interestingly, when I perform the same API call from my local system, it works as expected and returns a response within the specified timeout.

This issue has led me to suspect that there might be a connection timeout or network-related configuration on AWS EC2 instances that I am not aware of. I would appreciate your assistance in clarifying whether AWS imposes any connection timeout limitations for outgoing network calls made from EC2 instances and whether there are any specific network configuration settings I should be aware of that could be affecting my API calls.

I understand that AWS provides a range of security and networking features that may influence outbound connections, and I would like to ensure that my application's network settings are in alignment with AWS best practices.

If you could provide guidance or insights on this matter, I would greatly appreciate it. Additionally, if there are any diagnostics or specific logs that I should check to further investigate this issue, please let me know.

Thank you for your attention to this matter, and I look forward to your prompt response and assistance.

Sincerely,

Manohar Krishna Boppe
manoharkrishna@testsigma.com

Answer

Hello,

Greetings for the day!

I understand that you are getting Connection Timed out error on your instance while your application is trying to initiate an outbound network connection. In order to troubleshoot this issue I would suggest you to check the following:

- Check the Outbound rules present in the security group which is associated with your instance.
	- Check the rules in Network ACL which is associated with the subnet in which your instance is present.
	- If there is any firewall is present, then also check it's rules.
	- Check the route table associated with your instance.

As the issue is specific to your instance, we may need to investigate this more based on your configurations. I would request you to raise a support case in regards to your concerns. As this is a public platform, I will not be able to provide any sensitive information here.

[+] https://console.aws.amazon.com/support/home#/case/create

Note: Please do not post any sensitive information over re:Post since this is a public platform.

Thank you

Inquiry Regarding Outgoing Connection Timeout on AWS EC2 Instances

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