Issue Mysterius trouble with one domain and www.

[Joachim_Weisse]

Server operating system version

Ubuntu 20.04.6 LTS

Plesk version and microupdate number

Plesk Obsidian 18.0.54 Update #3

Hello,
I hope anybody can help.

Domain: https://www.zetorworld.com (with error) or https://zetorworld.com (runs without error)

I have set a new Domain via Plesk Obsidian: "domain.com"
I set: without www. as default
I install a Let's Encrypt Cert for domain.com and *.domain.com and activate all possible SSL features.
I install my site
I can view my site when I type "domain.com" in any browser - Fine, OK.

But I can't open my site when I type "www.domain.com" in any Browser instead the non-www version - Fails with the follow error:

• in Chrome eg: (latest Chrome for Win10, latest Chrome for Android):
  
  
• an in Firefox it brings this one:
  

But (!) only the www.domain.com is affekted from this error - the non www. (domain.com) runs absolut normal.


I tryed ALL instructions from here:

How To Fix ERR_SSL_VERSION_OR_CIPHER_MISMATCH?

The ERR_SSL_VERSION_OR_CIPHER_MISMATCH error occurs when your browser finds an issue with a site’s SSL certificate version. Learn more here.

www.plesk.com

I tryed to find problems with plesk repair (finds nothing, all fine)
I tryed to clean remove the Cert and try a new one fresh.

Nothing solmed my problem.

So if you guys have a idea - what I can do now, please let me know it.
If not, the only chance I see is to made a backup, remove my domain, set the domain new and restore then a partial backup in the hope to fix my error.

Greetings

 

[Maarten]

Hi,

The behavior you describe happens when you request an SSL certificate without the "www." prefix.
Please reissue a new SSL certificate, but include the "www." prefix.

 

[Joachim_Weisse]

I have... :


But it doesn't change anything.

Hosting settings:


Cert:


DNS:


Its also not my first and not my only site on my server - all others work (with and without www.) , but this one... kills me. ;-)


When you try to open: https://www.zetorworld.com = error,
When you try to open: https://zetorworld.com = all fine.

 

[learning_curve]

Hello,
I hope anybody can help.

Domain: https://www.zetorworld.com (with error) or https://zetorworld.com (runs without error)

~~

https://www.zetorworld.com is resolving (and failing) to IPv4 and IPv6 addresses that are different than https://zetorworld.com successfully resolves to...
That's your starting point...

You can see this for yourself, very clearly HERE and HERE

 

[Joachim_Weisse]

Ok, but why can this happen?
And how I can look in Plesk or via SSH to check and/or (in best case) solve this?

Plesk repair doesn't find an error in DNS config or file system config for this domain...

My plan B will be (if the problem is on Plesk site): fresh Backup, then remove the complete domainspace, set it new and hope this time it worls better.
I have around 10 domains used on my server, hosted at strato and domainspace created over plesk - all works, this one ... is the bad boy in my pocket. ;-)


I can do a test - create a sub domain test.zetorworld.com and will see its working or not. I dont think its a general problem with my server, I think there is going a little bit wrong with this one domainspace created by plesk.

 

[Joachim_Weisse]

OK, the wrong IPs are Strato default IPs, that is truely wrong. Only, at the moment I doesn't see the reason why.

 

[Kaspar]

Solving your issue should be a simple as deleting the AAAA (IPv6) DNS record for the WWW host of this domain.

You've posted a screenshot of the DNS zone from Plesk. But is the DNS zone for this domain actually managed trough Plesk? Because it looks like the DNS zone is managed externally.

 

[Joachim_Weisse]

It manged by Strato - but in the DNS settings by Strato is no AAAA-record set:

This looks at all my domains the same - but only this one will not work with www.

All domains at my server:

all domains hosted by Strato, and all worked from skratch as it should be with and without www.

Example:
also my domain: zetor-forum.de (worlks with and without www. and both use the same shared IP address)
DNS settings:

DNS settings for this domain in Plesk:


looks for me pretty much the same for both domains.

I can set for a test the IPv6 at Strato to the one I see for use over Plesk for zetorworld.com - but this will be then the first domain who I set this. I try it.

 

[Joachim_Weisse]

Only this CNAME record is at zetorworld to see, but in no other domain from me. In plesk I cant remove it, after a Time, its back here again.
At Strato I cant find such a CNAME record... there are only TXT records for SSL (acme...) and mail (DKIM eg) but no CNAME.
The CNAME records I only see at Plesk.

 

[learning_curve]

OK, the wrong IPs are Strato default IPs, that is truely wrong. Only, at the moment I doesn't see the reason why.

You've already (perhaps unwittingly) answered your own initial question(s) nonw and have actively taken note of the helpful post above by @Kaspar
It's a simple (Non-Plesk) misconfiguration, nothing more serious than that. You should, with patience (!) be able to correct this quite easily, but... Your own server's DNS config - including its true control location & possibly your own access levels at Strato, will determine the speed & ease of re-configuration.

 

[Kaspar]

If your DNS is managed by your provider (Strato) contact their support for help to remove the AAAA record.

 

[Joachim_Weisse]

I think that will be at this point the best - I call Strato support, while I haven't access to the missconfigured AAAA record from customer side.
Thanks for the help, that takes me an the right way (i hope so).