Randomly unable to connect to ec2 instance from some networks

Question

Randomly I am unable to connect to ec2 instance from office network and some others. When it happens I am unable to ping ec2 instance from this networks, but if I use a VPN it return to work correctly.

It works fine outside the office network and with 4G hotspot. Looks like something is getting blocked in specific networks.

Security groups seems configured well inbound/outbound rules (here https://i.stack.imgur.com/8GCaS.png)

Here StackOverflow thread for more info https://stackoverflow.com/questions/70891480/randomly-unable-to-connect-to-ec2-instance-from-some-networks

Answer

yes, the problem is on http/s connection, not ssh

Answer

If you can consistently do that outside your office network, most likely it's the issue with your corp network that's blocking traffic.  You should contact your network admin.

One way to try to troubleshoot is using tracert command and optionally enable and check VPC flowlogs.

If you were not able to see the traffic coming in in the VPC flowlog, it might suggest the packet is dropped before reaching AWS.

Answer

This is the tracert on machine connected to network with the error (while error occurs) https://i.ibb.co/QmwXQFj/err.png

Randomly unable to connect to ec2 instance from some networks

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