Plesk Default Page when entering Domain in Facebook-Thread

[Torte]

Hi,

I have Plesk 12.5 running on Ubuntu and I am hosting a couple of websides. I am not figuring out any problems myselves, but I got informed from two people, that they are not able to visit the page. When they try to enter the page, they receive the Plesk Default page and not the webside (virtual host). I was not able on any of my testing machines (PC or Mobile Devices) to reproduce this problem. But... I noticed that if I make a post on Facebook with the Domain (complete URL), Facebook resolves the URL also to the Plesk Default Page and not the virtual host.

My Setup:
- IPv4 and IPv6 with shared IP
- DNS setup done for IPv4 and IPv6
- the websides also have the shared IPv4 and IPv6 assigned (since yesterday around lunchtime)

My first thought was, that there meight be a DNS problem with IPv6. I added yesterday around lunchtime also the shared IPv6 address to the websides and wait until now (DNS changes ca take longer, I know). But Facebook still resloving the Domain/URL to the Plesk Default Page and not to the virtual host.

The Domains are:
http://www.motobike.de
http://www.fahrrad-walther.de

A domain on this server that seams to work is:
http://www.tt-lan.de

One of the guys that report a problem was using his mobile phone (iPhone6S). It was not working with Safari, Firefox and Chrome. He also tried this when connected to his home broadband. At the same time he was able to access the correct side from his lokal PC (same network / home broadband, so I asume also some IPv4 or maybe IPv6 usage and DNS provider / information).
The other one send us a screenshot from his internet browser (Microsoft Edge) from a windows machine.

If more informations are needed, please let me know ...

best regards Torsten

 

[IgorG]

I assume that requests from Facebook were coming from an IPv6 server, but the Apache configuration files generated by Plesk did not include IPv6 addresses in the VirualHost settings. Usually, it contains:

<VirtualHost IPv4:80>

instead of:

<VirtualHost IPv4:80 [IPv6]:80>

So, make sure that IPv6 address is really assigned to the Subscription that owns the domain in your question.

 

[Torte]

Hi,

thanks for the reply. Yesterday around lunchtime, I asigned in Plesk-Panel for this domains also the IPv6 address. Plesk shows the domains in "Tools & Settings" > "IP Addresses" correctly in the IPv4 and IPv6.

I just checked the config-file "httpd.conf" for this domain (/var/www/vhosts/system/motobike.de/conf/)

I have this entry for IPv6 :
<VirtualHost [<IPv6>]:7080 127.0.0.1:7080>
ServerName "motobike.de:80"
ServerAlias "www.motobike.de"
ServerAlias "ipv6.motobike.de"
...
...

I also have the following entries :
<VirtualHost <IPv4>:7081 >
ServerName "motobike.de:443"
ServerAlias "www.motobike.de"
ServerAlias "ipv4.motobike.de"
...
...

<VirtualHost [<IPv6>]:7080 127.0.0.1:7081>
ServerName "motobike.de:443"
ServerAlias "www.motobike.de"
ServerAlias "ipv6.motobike.de"
...
...

<VirtualHost <IPv4>:7080 >
ServerName "motobike.de:80"
ServerAlias "www.motobike.de"
ServerAlias "ipv4.motobike.de"
...
...

I also checked the "nginx.conf" file in that directory :

server {
listen [<IPv4>]:443 ssl;
...
...

server {
listen [<IPv6>]:443 ssl;
...
...

server {
listen [<IPv4>]:80;
...
...

server {
listen [<IPv6>]:80;
...
...


regards Torsten

 

[UFHH01]

Hi Torte,

for facebook, pls. keep in mind to use the facebook tools at "https://developers.facebook.com/tools/debug/". You will find as well a button there, which let's you reparse the defined site ( => "Scrape again" ). I just did that for you, because the last one was from 18.05.2016 ( motorbike... ) and the other one 21 hours ago ( fahrrad.. ).

Pls. check now again, by posting a new post at facebook, if the correct sites are parsed.

 

[Torte]

for facebook, pls. keep in mind to use the facebook tools at "https://developers.facebook.com/tools/debug/". You will find as well a button there, which let's you reparse the defined site ( => "Scrape again" ).

great ... posting the URL in Facebook is now working again ... thanks for this info...

OK... this means, that my currently setup (IPv4 and IPv6) is generaly working and the problem with facebook was to say "cached content" ... after "renewing" it works. Maybe it takes also still a couple of hours for the second problem that was reported by two of our customers (Microsoft Edge and iPhone6S). Because, I did the IPv6 setup yesterday around lunch time ... will get in contact with this users and ask them to try again in a couple of hours.

regards Torsten