Hi @srostam
if you have the "During secondary validation" error: First read
So the main Letsencrypt servers are able to check your domain. The secondary servers may be blocked.
Checking your subdomain - lordegan.khoshpaz.ir - Make your website better - DNS, redirects, mixed content, certificates there are some minor name server problems visible.
Checking your main domain that doesn't look good - khoshpaz.ir - Make your website better - DNS, redirects, mixed content, certificates
One ip address with your website and both of your name servers - ns1.khoshpaz.ir + ns2.khoshpaz.ir - 158.58.189.28. Normally, name servers should have different ip addresses.
May be there is a regional firewall, so the secondary servers are blocked.
And there is a new certificate of your subdomain:
| Issuer | not before | not after | Domain names | LE-Duplicate | next LE |
|---|---|---|---|---|---|
| Let's Encrypt Authority X3 | 2020-04-22 | 2020-07-21 | lordegan.khoshpaz.ir, www.lordegan.khoshpaz.ir - 2 entries | duplicate nr. 1 |
Created 2020-04-22. Isn't it possible to use that?