Problem solved! But I have no clue why…
Tried the cert-sync command multiple times, always with the same result:
....@....:~# sudo cert-sync /etc/ssl/certs/ca-certificates.crt
Mono Certificate Store Sync - version 5.4.1.6
Populate Mono certificate store from a concatenated list of certificates.
Copyright 2002, 2003 Motus Technologies. Copyright 2004-2008 Novell. BSD licensed.
Importing into legacy system store:
I already trust 176, your new list has 174
Import process completed.
Importing into BTLS system store:
I already trust 175, your new list has 174
Certificate added: C=IL, O=StartCom Ltd., OU=Secure Digital Certificate Signing, CN=StartCom Certification Authority
1 new root certificates were added to your trust store.
Import process completed.
But I still got errors without using --accept-any-ssl-certificate=true. Magically, it now works without this setting!
