Cannot create ssl certificates in Let's Encrypt

Unfortunately, I don’t get to create certificates in Let’s Encrypt. I’m already with my Latin at the end. I get the following error message:
ValueError: Challenge did not pass for {u’status’: u’invalid’, u’challenges’: [{u’status’: u’invalid’, u’validationRecord’: [{u’url’: u’’, u’hostname’: u’’, u’addressUsed’: u’’, u’port’: u’80’, u’addressesResolved’: [u’’]}], u’url’: u’’, u’token’: u’e0q4PEP9xKuveSm3Rq6p0bykNl1zt3D_o5iHhkAFab4’, u’error’: {u’status’: 403, u’type’: u’urn:ietf:params:acme:error:unauthorized’, u’detail’: u’Invalid response from []: "\r\n

I called the website with curl -i and could call up the Test.txt without any problems.

I hope you can help me,



Hi @milzie

checking your domain there is the correct answer http status 404 - Not Found ( ):

Domainname Http-Status redirect Sec. G 302
Html is minified: 104,00 % 0.094 A 302 Html is minified: 104,00 % 4.427 B 302 Html is minified: 104,17 % 4.250 B No GZip used - 6555 / 17451 - 37,56 % possible Inline-JavaScript (∑/total): 4/6029 Inline-CSS (∑/total): 0/0 200 Html is minified: 194,59 % 5.064 B Inline-JavaScript (∑/total): 0/0 Inline-CSS (∑/total): 1/4 404 Html is minified: 202,36 % 0.093 A
Not Found


Server: Microsoft-IIS/8.0

Is there a web.config with


to allow extensionless files? Change your test.txt into 1234 as file name (without extension) and check that url directly.

1 Like

Hello Jürgen,
the UCS server runs in a VirtualBox on a Windows Server 2012.
The mail server Kopano and Nextcloud run on the UCS server. I access the Internet address “” to send my e-mail and retrieve and further on my cloud.

The web.config file does not exist on my computer.



I tried to create a certificate with the website and then I get the following message:
“Detail”: “Error creating new order :: Cannot issue for “”: Invalid character in DNS name”,

You can't create a certificate with a port. You can use a certificate with every port.


That's the first problem using IIS. So your test with test.txt is completely unrelevant.


This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.