CentOS 7 - Won't accept any SSL certificates

I have a problem on my CentOS 7 box doing anything that requires SSL, including curl, wget or updating via YUM.

The output is always the same:

[root@localhost ~]# curl -I -v https://google.com
* About to connect() to google.com port 443 (#0)
*   Trying 74.125.138.100...
* Connected to google.com (74.125.138.100) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* Server certificate:
*       subject: CN=*.google.com,O=Google Inc,L=Mountain View,ST=Califoia,C=US
*       start date: Jun 16 08:37:32 2016 GMT
*       expire date: Sep 08 08:29:00 2016 GMT
*       common name: *.google.com
*       issuer: CN=192.168.2.44,C=US
* NSS error -8172 (SEC_ERROR_UNTRUSTED_ISSUER)
* Peer's certificate issuer has been marked as not trusted by the user.
* Closing connection 0
curl: (60) Peer's certificate issuer has been marked as not trusted by the user.
More details here: http://curl.haxx.se/docs/sslcerts.html

All certificates appear to be "marked as not trusted". I tried reintalling CA certificates doing this:

yum --disablerepo="epel" reinstall ca-certificates

but that didn't help. Any ideas?

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