download.osgeo.org certificate not recognized by curl / wget

[rouault]

Since a few hours ago (April 28 2019), I get errors from curl and wget when downloading from ​https://download.osgeo.org. This is on Ubuntu 16.04 (and also true from Travis-CI workers)

$ curl https://download.osgeo.org/proj/proj-6.0.0RC4.tar.gz 
curl: (60) server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

$ wget https://download.osgeo.org/proj/proj-6.0.0RC4.tar.gz 
--2019-04-28 12:25:26--  https://download.osgeo.org/proj/proj-6.0.0RC4.tar.gz
Resolving download.osgeo.org (download.osgeo.org)... 140.211.15.132
Connecting to download.osgeo.org (download.osgeo.org)|140.211.15.132|:443... connected.
ERROR: cannot verify download.osgeo.org's certificate, issued by 'CN=Let\'s Encrypt Authority X3,O=Let\'s Encrypt,C=US':
  Unable to locally verify the issuer's authority.
To connect to download.osgeo.org insecurely, use `--no-check-certificate'.

In Firefox 66, this works

[robe]

This might be baecause I switched it it a letsencrypt wildcard cert. Before it used to be SSLs.com cert which is going to expire very soon.

Let me see if it works better with a single cert. I'll try in a minute

[jef]

Replying to robe:

This might be baecause I switched it it a letsencrypt wildcard cert. Before it used to be SSLs.com cert which is going to expire very soon.

SSLCertificateChainFile was just not pointing at chain.pem