SSL Certificates and Apache Virtual Hosts - apache

Question

I am encountering a very curious problem with my ubuntu server setup. I am running a few websites using a LAMP stack.
One of the websites has a dedicated ip and a comodo ssl certificate. The other websites are on a shared ip and use let'sencrypt ssl certificates.
Here's the virtual host config for the website on the dedicated ip:
# domain: example.com
# public: /home/myhomefolder/public/example.com/
<VirtualHost actual_dedicated_ip:80>
# Admin email, Server Name (domain name), and any aliases
ServerAdmin admin#example.com
ServerName www.example.com
ServerAlias example.com
Redirect permanent / https://www.example.com/
# Index file and Document Root (where the public files are located)
DirectoryIndex index.html index.php
DocumentRoot /home/myhomefolder/public/example.com/public
# Log file locations
LogLevel warn
ErrorLog /home/myhomefolder/public/example.com/log/error.log
CustomLog /home/myhomefolder/public/example.com/log/access.log combined
</VirtualHost>
<VirtualHost actual_dedicated_ip:443>
SSLEngine On
SSLProtocol ALL -SSLv2 -SSLv3
SSLHonorCipherOrder On
SSLCipherSuite ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
SSLCertificateFile /etc/apache2/ssl/www.example.com.crt
SSLCertificateKeyFile /etc/apache2/ssl/www.example.com.key
SSLCertificateChainFile /etc/apache2/ssl/www.example.com.ca-bundle
<Directory /home/myhomefolder/public/example.com/public>
Require all granted
AllowOverride ALL
</Directory>
ServerAdmin admin#example.com
ServerName example.com
DocumentRoot /home/myhomefolder/public/example.com/public
ErrorLog /home/myhomefolder/public/example.com/log/https_error.log
CustomLog /home/myhomefolder/public/example.com/log/https_access.log combined
</VirtualHost>
Everything works fine except on specific networks (so far I can only reproduce this on my iphone when connected to Verizon LTE but not when connected to wifi) I get either an error saying "Safari cannot open the page because too many redirects occurred" or I get a prompt with "cannot verify server identity" and the certificate details is for another websites on the same host but a different ip.
Any ideas of what may be causing this?

Answer 1

So I finally got to the bottom of this. It looks like verizon is using ipv6 and my vhost had only ipv4 configuration. As soon as I added my ipv6 ip in my vhost, the problem went away.