Hi! I didn't know that the ssl certificate is deleted when reinstalling the server, and I spent all attempts. How do I get my ssl certificate back?
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Hello @MinatsukiYue, and welcome to the LE community forum 
Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.
My domain is:
I ran this command:
It produced this output:
My web server is (include version):
The operating system my web server runs on is (include version):
My hosting provider, if applicable, is:
I can login to a root shell on my machine (yes or no, or I don't know):
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
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My domain is: newhrust.space
I ran this command: sudo certbot --nginx -d newhrust.space -d www.newhrust.space
It produced this output: There were too many requests of a given type :: Error creating new order :: too many certificates (5) already issued for this exact set of domains in the last 168 hours: newhrust.space,www.newhrust.space: see Duplicate Certificate Limit - Let's Encrypt
My web server is (include version): idk
The operating system my web server runs on is (include version): Ubuntu 18.04
My hosting provider, if applicable, is: https://reg.ru
I can login to a root shell on my machine (yes or no, or I don't know): idk
I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot): certbot 0.31.0
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Your Issuer: C=BE, O=GlobalSign nv-sa, CN=GlobalSign Extended Validation CA - SHA256 - G3
Side note your certificate has
Validity
Not Before: Jul 16 08:49:18 2021 GMT
Not After : Aug 15 15:12:27 2022 GMT
Thus it is Expiring soon.
So if you still have the Private Key for the domain there should not be an issue, since you only deleted the certificate (assuming you did not delete the Private Key).
Using this SSL Checker - Check SSL Certificate
I am able to view the PEM file that is your certificate
#start /businessCategory=Private Organization/serialNumber=1067746613494/jurisdictionC=RU/jurisdictionST=Moscow/C=RU/ST=Moscow/L=Moscow/street=proyezd Berozovoy Roshchi, 12 etazh 2 Komnata 4/O=Domain name registrar REG.RU LLC/CN=www.reg.ru
-----BEGIN CERTIFICATE-----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ILc2mHHtUnrqCAD3/n8h/SdRd1bGjRFSaSnd13rs3WTB3v4j2GPekj8sl2IKrjHG
6PSKwnWgDlJ8gJK1Y9pOD6A4CN6GPYNPT6ahboizpSjhhRagAQ3iNFUTE/bEtNzK
18/fNGNIKScEbH+2tORWAFnAaD4UoTVu8rFzm1WH/bMnbV4mpJK5n65xxkv4rggv
0iqh0At5TIeFt27CM4YI9gWagmjnfRyVJ7jj6d04O51Dg5i689aB/MKo4FPf7e4X
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69mykycKKdw3MNA3uQnCn455ladEXd5trXsJ4LYhSwue5sIyYZuSM6OhJ1UoVa0L
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aCsTW00Ipdrs4KYwDQYJKoZIhvcNAQELBQADggEBAJj3Em4UrZiat6DDwYOD9Fvv
bmpDLGIZAxDUTIO+rD8pIGqnGrdz3vEhytNan9t/e0+C2N82X91OwuwQAr5LMJ2V
LC/B+fx+/YvgqFka1NeXGxz2Z1jsc4od0CujHHx16YICy4YSTprxvjc9ByPTV+wu
pNoWmeWjc0vuc0d6WuFIS4r11HU2PdUtCxtAT+p8D1b9Ot3mZN7suVQuuVZavkE2
NdSNQ5cKQMqMJeQ8Gjw6Vdbj3nXrZPEyFLllSF1rTsBodUrMVSNEUBHgM+pG3yFJ
NRQzcQtN+8k6ZLN8C14Rv6TK4HCf7lOBd+yTUrkfiv2iANgil6UdXgO9ZyuB1Xs=
-----END CERTIFICATE-----
#end /businessCategory=Private Organization/serialNumber=1067746613494/jurisdictionC=RU/jurisdictionST=Moscow/C=RU/ST=Moscow/L=Moscow/street=proyezd Berozovoy Roshchi, 12 etazh 2 Komnata 4/O=Domain name registrar REG.RU LLC/CN=www.reg.ru
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Where to install this key?
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The Certificates you have received for your domain are listed here: https://crt.sh/?q=reg.ru
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How to install this key?
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I believe your Server: nginx
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This not the Private Key but the signed Certificate, from the CA; it will contain the Public Key associated with your Private Key.
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How to install this key?
Here would be a good place to start Configuring HTTPS servers
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Here is the list of certificates issued for the above domain: newhrust.space
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And you are using Server: nginx/1.14.0 (Ubuntu) for
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Also from crt.sh | newhrust.space
something like this crt.sh | 7224071462 you can download the PEM file of your issued Certificates.
Again you will still need the associated Private Key of the Certificate.
Try using https://ssl-config.mozilla.org/ to start with; I am guessing something like
Mozilla SSL Configuration Generator
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