Unfortunately Lets Encrypt: Failed to lock file /etc/httpd/conf.d/ssl.conf was closed, so I had to open a new topic (anyway the proposed solution seems to be ref. to a RedHad/CentOS install - our box is on Debian 
)
In Virtualim:
|**Time since last renewal**|0.02 months|
| --- | --- |
|**Last successful renewal**|07/16/2020 6:40:24 PM|
|**Last failed renewal**|09/14/2020 6:59:29 PM|
|**Renewal failed due to**|Web-based validation failed :
Saving debug log to /var/log/letsencrypt/letsencrypt.log|
In aforementioned debug log:
2020-09-15 10:58:52,801:DEBUG:acme.client:Storing nonce: 0102pa8efZMGpk2R2Q8Y2GcBOQycY5JnO5KiTg5055KZ1vc
2020-09-15 10:58:52,802:WARNING:certbot.display.util:Skipped user interaction because Certbot doesn't appear to be running in a terminal. You should probably include --non-interactive or --force-interactive on the command line.
2020-09-15 10:58:52,802:DEBUG:certbot.display.util:Falling back to default False for the prompt:
Would you be willing to share your email address with the Electronic Frontier Foundation, a founding partner of the Let's Encrypt project and the non-profit organization that develops Certbot? We'd like to send you email about our work encrypting the web, EFF news, campaigns, and ways to support digital freedom.
2020-09-15 10:58:52,802:DEBUG:certbot.reporter:Reporting to user: Your e-mail address was updated [xxx@xxx.xxx]
I already restarted apache, as proposed elsewhere.
Any idea on how to fix this?
Cheers 