Hi @giacomo,
Thanks for looking into this. I’ll level set with you because I can’t say I have the answer here either. All I know is myself and my friend both added our wildcard certs to our own nethservers and both times webtop became broken. I know you remoted into my server and looked around and confirmed that it was certificate problem. So I did some research on the nethserver forums and found this post by Filoppo Carletti where
his SSLCertificateChainFile in /etc/pki/tls/certs/ had an extension of .pem (not .crt)
So I took a chance and renamed my chain file from .crt to .pem and immediately my webtop started to work again. I then had my friend make the same change and sure enough his webtop suddenly started to work again.
I don’t know why it worked or what’s different about our chain files and the one you are using (where .crt works for you).
Sorry I can’t give you more information.