All Browsers error: Invalid Certificate?

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., 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:
tried to go to

It produced this output:
Invalid Certificate error, see screenshot

My web server is (include version):
Synology DSM 6.x

The operating system my web server runs on is (include version):
Synology DSM 6.x

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):
Synology DSM 6.x

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you’re using Certbot):
Synology DSM 6.x

Works fine here. Obviously, I can’t log in. When do the errors start? Do you have a screenshot of the error?

Hi @Ltek

your main domain with the standard port has the wrong certificate ( ):

Domainname Http-Status redirect Sec. G 403 0.327 M
Forbidden 401 2.327 N
Certificate error: RemoteCertificateChainErrors
E=root@localhost, O=ASUSWRT-Merlin, CN=, C=US
expires in 3237 days,,, 
RT-AC68R, RT-AC68R.home.lan, 
asusrouter, asusrouter.home.lan, - 8 entries

A self signed router certificate.

But as @Osiris wrote, your 5001 port has the correct certificate ( ):

Domainname Http-Status redirect Sec. G 400 0.326 M
Bad Request 200 2.480 I

Checking one port only http or https can work -> your https works, there is the correct certificate
expires in 24 days - 1 entry

So the "Bad Request" checking http isn't a problem.

Sounds like you have the wrong router settings so you see the router certificate.

Thx for helping, I’m new to certs… So question: Do I need to install the same cert on the ASUS router as I do on the Synology? I dont have any certs installed on my router. thx!

I don't know. I have no idea why there is a certificate with visible. I "think" it's sent by your router, but I don't know it.

Probably just a self signed certificate generated by the router itself.

For what reason? Do you need other people to access your router securely?

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