[strongSwan] strongSwan with Let's Encrypt certificates

[laurens at daemon.be]

Hello list,

I've configured strongSwan following this guide a while back: 
https://dcamero.azurewebsites.net/. Everything worked back then (3+ 
months ago). Unfortunately, I let the cert expire. I renewed it today 
and now my connection to strongSwan doesn't work with the new 
certificate.  Might anyone have an idea what I'm missing? As far as I 
remember I didn't do anything special back then...

Thanks in advance!