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What tools help diagnose network disconnection problems on Ubuntu

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We have a server under DigitalOcean running Ubuntu 22.10

On that server are four processes each of which maintains a socket connection to a service on a different remote machine. So four processes each connected to one of four different remote hosts.

Each process sends a 'ping' to ensure the connection is alive and records the ping time in a database table.

Occasionally we see all four connections dying at the exact same time (the four processes remain up). The reconnection logic in each doesn't work. We look at the database and the last successful connection time for each process is exactly the same or very close.

I can log in to the machine using SSH

When one of these glitches happen, the web apps we have running on that machine stop accepting incoming connections

So this looks like an our server or Digital Ocean network infrastructure issue.

What tools does Ubuntu offer that might shed light on what's causing this?

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