IP-1798: Let's Encrypt validate for system services

Quote from Youtrack

Reporter	Proci (Proci)
Created	Sep 10, 2018 10:03:30 PM
Updated	Sep 10, 2018 10:03:52 PM
Priority	Normal
Type	Bug
State	Submitted
Assignee	Laurent Declercq (nuxwin)
Subsystem	No subsystem
Affected versions	1.5.3
Milestone	1.6.0
Severity	No severity

System tools -> Let's Encrypt -> Control panel or Services
I get error messages:
Failed authorization procedure. mail.domain.hu (http-01): urn:ietf:params:acme:error:connection :: The server could not connect to the client to verify the domain :: Fetching http://admin.domain.hu:8080.well-known/acme-challenge/rWcRGs8HZmhCEhbvmP64836MXTFUJRlaDLSFi72kNfQ: Error getting validation data at /var/www/imscp/gui/plugins/LetsEncrypt/backend/LetsEncrypt.pm line 834.

The problem is in the URL: domain.hu:8080.well-known
8080_._well

I can create let's encrypt ssl in customer account for customer domains as well, but I can't create for system.

let's enctypt plugin 3.5
imscp 1.5.3
debian 9

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Source: https://youtrack.i-mscp.net/issue/IP-1798