https://api.discogs.com/releases/249504
is using an digicert signed certificate
So you need do look for digicert ca at certmgr
Test: open that api url in internet explorer (not firefox cause firefox has an own keystore) to check if certificatei is valid against windows keystore.
on windows 10 keychain is valid:
I'm sure on windows 7 it isn't! Try to reproduce. Check certmgr for any Cert/CA in Chain.