Edgerouter / EdgeOS IPsec Site to Site Troubleshooting

I have a client setup with multiple Edgerouter’s in an IPSec Site to Site configuration. I’ve setup a Policy based IPsec site to site configuration using this guide here. However, sometimes they just refuse to connect, with no real reason as to why. Edgerouters use StrongSwan for its VPN, so some of its troubleshooting information
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