certificate – VPN event ID IKev2 20209 – Server authentication

I have made a single certificate for VPN access with ikev2. In 2 days I got the id. From event 20209, although I did not try to connect. The certificate is still with me and no one else has access to it. But the event viewer claims that

A connection between the VPN server and the VPN client 92.63.194.91 has been established, but the VPN connection cannot be completed. The most common cause for this is that a firewall or router between the VPN server and the VPN client is not configured to allow Generic Routing Encapsulation (GRE) packets (protocol 47).

This IP has been dialed for BruteForce VPN attempts on many sites.
I just want to know how they managed to connect without a certificate.

self-signed: the CN name of the certificate does not match the value passed

Every time I teach a network course and try to create and use self-signed certificates with the Windows 10 SSTP client, we encounter the dreaded error message "The CN name of the certificate does not match the past value"

Server and CA certificates are created, signed, and trusted. Then we select the server certificate in the SSTP server configuration and export the ca certificate for the Windows PC:
https://gyazo.com/10e785b7c51a17572bf40ee85ff744e1

Initially we would specify the IP address of the sstp router (server) as the CN of the server, and we would set "ca" as the CN of the ca, but recently I noticed that Windows only accepts the ca if its CN also corresponds to this same IP

We import the certificate on the Windows PC:
https://prnt.sc/r7bkhe

Set up the Windows SSTP client:
https://gyazo.com/72a61e75c37ed38fdc633b5914729865

And then connect:
https://gyazo.com/b034fa2de61f0c33cc665549521d6f52

I guess the problem lies in Windows, but I can't seem to find where the problem is

Any suggestion?
Cheers
Yann

Certificate edition and details change for $ 5

Certificate edition and details change

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  1. The default size would be 11 "x 8.5" (Bleed "0.125") and A4 (11.69 "x 8.27" with Bleed "0.125")
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. (tagsToTranslate) Certific (t) fakedocu (t) document (t) photosho (t) edit (t) id

python: extract public key from certificate signing request

You can use openssl to display the information in a CSR, including the public key. I saved your CSR in a csr.txt file, then ran the following command:

openssl req -in csr.txt -noout -text

This produced:

Certificate Request:
Data:
    Version: 1 (0x0)
    Subject: C = US, ST = Utah, L = Lindon, O = DigiCert Inc., OU = DigiCert, CN = example.digicert.com
    Subject Public Key Info:
        Public Key Algorithm: rsaEncryption
            RSA Public-Key: (2048 bit)
            Modulus:
                00:f3:e4:e8:ed:df:b6:90:f5:9e:06:ff:e8:ad:4d:
                cb:55:b2:70:0e:b4:90:6d:e2:9a:98:29:a8:c2:9e:
                5b:a8:3c:48:c1:5d:b4:ce:a4:5b:ec:03:d4:38:a6:
                28:54:41:45:38:44:2c:e9:3e:a0:22:69:c8:a2:58:
                5b:88:7e:a6:e3:38:19:fc:23:ef:58:13:a4:65:cf:
                9c:d4:fa:36:12:6b:c1:cf:e0:03:e6:c0:5d:4f:99:
                33:19:00:3a:35:b5:b2:64:69:5d:c5:1b:61:34:b3:
                ac:d5:e7:ce:85:d9:d6:16:e8:48:d7:ad:aa:99:c7:
                e5:82:98:88:58:3b:b0:ab:80:bd:7f:e6:24:78:98:
                4d:9f:d7:45:e7:ea:30:9b:c7:0e:42:60:eb:57:c3:
                4d:76:24:ea:8a:7f:2a:de:a6:00:1c:72:51:5b:6f:
                20:94:95:02:66:44:d9:c0:86:92:47:a7:2b:05:0f:
                13:6d:83:44:d1:d7:3e:09:a6:b7:0c:e2:24:cf:51:
                0e:b0:75:b3:4f:1f:a7:d3:32:9f:a9:c6:e0:5e:2e:
                03:27:1f:82:d5:b8:e9:b5:83:d1:04:f6:4b:f0:30:
                1e:5a:e0:3c:79:bb:9d:55:3e:38:c8:4a:7c:d8:6f:
                7a:fc:68:1c:7f:b1:77:df:13:31:7b:4c:9c:f9:76:
                ba:a3
            Exponent: 65537 (0x10001)
    Attributes:
        a0:00
Signature Algorithm: sha1WithRSAEncryption
     1d:24:72:b1:5c:71:29:85:0e:6c:68:c7:43:5e:d3:55:08:a9:
     2b:03:a8:78:0b:f9:79:87:4d:72:70:ad:ee:83:84:94:99:c1:
     bb:c4:b4:e2:b4:1b:7f:9d:af:81:6c:d7:55:ae:50:db:79:a9:
     c2:ec:c7:96:bc:ba:4e:06:e8:02:87:33:3b:a1:2e:c2:7b:5d:
     98:e0:99:05:c6:10:2a:58:43:89:82:df:24:f7:66:80:86:a4:
     85:db:c3:e8:8f:de:59:84:11:78:1a:40:bd:13:c7:92:c5:97:
     fa:24:29:b2:98:c0:8a:8d:8b:22:96:38:c8:fb:65:1f:f0:c5:
     68:3f:64:31:91:b3:9e:71:ba:87:8b:0c:9f:d9:44:57:fd:6c:
     8f:88:68:25:1d:d5:8a:df:61:c1:c8:97:71:bc:ec:0b:fe:af:
     8f:58:57:0a:91:0d:3d:15:0d:5e:ee:2e:0a:a7:db:d5:c8:d4:
     fa:55:50:d0:8f:40:69:fd:a7:f7:97:e9:0a:3b:be:90:da:3f:
     26:d1:b4:0d:91:ed:72:ca:8d:06:85:f6:85:d6:78:25:2a:cb:
     58:6f:25:a7:3d:40:53:b6:f7:b3:9b:d5:a9:69:1c:fa:19:ee:
     65:a2:12:e2:70:8c:13:e2:8b:a6:bd:33:d1:b7:d2:75:28:df:
     d9:41:8b:5c

Compilation with a witness / certificate

Sometimes, to install a program, you can choose to compile it yourself or download a precompiled binary. In theory (using a new programming language and a new compiler designed specifically for this), is it possible to generate a token / certificate with the compiled binary so verifying the token / certificate is very easy compared to compiling things yourself , but does it ensure that the compilation actually produces this binary?

To avoid trivial answers, I will specify things a bit more: the source language must contain ML and the target language must be a realistic assembly language. The compiler must do a lot of optimizations so that the speed of the compiled program is comparable to that of OCaml, and in particular the compilation cannot simply concatenate an interpreter and the source.

From what I've read, the longest in the build are the optimizations. So my question is more or less: can optimizations run much faster on a non-deterministic machine (in which case we can use the token to know which way to go on the real machine).

SSL certificate for Sophos and Portforward to the website

If I buy an SSL Certificate for my website and install it on the Sophos firewall. Will it be valid if port 443 is forwarded to the internal host (192.168.1.100:443)? Or should it be installed directly on the web server?

SSL certificate for Sophos and Portforward to the website

If I buy an SSL Certificate for my website and install it on the Sophos firewall. Will it be valid if port 443 is forwarded to the internal host (192.168.1.100:443)? Or should it be installed directly on the web server?

x.509 – How does cloudflare negotiate your server certificate?

When I access https://somecompany.com on my company's laptop that has an X509 client certificate installed, using my home internet connection, without using a VPN, the requested page is signed using the root CA of the company (which was distributed to my laptop company through group policies I guess).

When I access https://somecompany.com on my private laptop that doesn't have a client certificate installed, with the same connection, I get access error (403) with a cloudflare logo (the address bar is still https : / /somecompany.com). That error is expected because I don't have a client certificate. Interestingly, the error page is signed by cloudflare's intermediate CA itself.

My question: how does Cloudflare change server certificates during TLS handshake depending on the existence of a client certificate? The server certificate is sent before the client certificate. It's brilliant how all this works, but I don't understand how they managed to implement it.

What seems to make a difference is the TLS version. If I use a browser without TLS 1.3, all content is signed with the Cloudflare certificate, regardless of whether I have a client certificate or not. Is there a certificate renegotiation protocol in 1.3? (I can't find the specifications)

IP Address: Unable to get certificate due to multiple IP addresses for subdomain

Correct me if I am wrong, as I am a novice in everything related to the server.

I have a website example.com hosted on host A.
I want to create subdomain sub.example.com on host B – instance EC2 in this case.
Now I did this by changing the A record in my subdomain, to point to the elastic IP of this EC2 instance.
I visit sub.example.com and works. Hurrah.

However, when I try to add an SSL certificate using LetsEncrypt, I get the error:

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A/AAAA record(s) for that domain
   contain(s) the right IP address.

https://www.whatsmydns.net/ gives me full marks on all dns servers

https://dnschecker.org/all-dns-records-of-domain.php shows that I have two IP addresses for the same domain name. One is the Ec2 instance, the other is the IP of the primary domain.

WARNING
sub.example.com has multiple IP addresses in its DNS records. While they appear to be accessible on the network, we have detected that they produce differing results when sent an ACME HTTP validation request. This may indicate that some of the IP addresses may unintentionally point to different servers, which would cause validation to fail.
(Address=ec2.ip.addr,Address Type=IPv4,Server=nginx/1.10.3 (Ubuntu),HTTP Status=404) vs (Address=main.domain.ip.addr,Address Type=IPv4,Server=nginx,HTTP Status=301,Number of Redirects=1,Final HTTP Status=404)

Where's my mistake in all of this? Am I missing something obvious? How can I create the correct SSL certificate for the subdomain or remove the wrong IP address of my subdomain so that it still points to the ec2 instance?

Is this possible?
Thank you

Does HSTS prevent MITM from using a valid certificate?

HSTS does not contain any type of fingerprint (it would be HPKP instead). It only says that the site should be loaded with HTTPS and that the certificate should be directly trusted, i.e. it should not be allowed to bypass user warnings. To the extent that HSTS does not prevent MITM if the attacker can use a valid certificate issued by a client's trusted CA.

It is unclear what exactly you have seen with the Burp suite, but maybe you were used to bypassing certificate warnings when using Burp instead of importing CA of Burp as trusted, and bypassing certificate warnings no longer works with HSTS.