Letsencrypt not working on one site

I have my server on a DMZ (NAT'ed) and I have turned off Letsencrypt check in server settings.
Site: https://vmsources.com will not create certificate after migration to new server
Sites: https://support.vmsources.com and https://share.vmsources.com created certificates
Sites are not created as sub-domains, rather A-records exist for each and each is an individual site in ISPconfig.
Also, there does not seem to be a Letsencrypt log file anywhere

Code:

root@web1:/var/log/ispconfig# find / -name letsencrypt.log
root@web1:/var/log/ispconfig#

THX in adv.
-John

 

When I create a self-signed certificate, the site loads. It just seems to be Letsencrypt.
Site now reverted to old server until I can figure out.
THX,
-John

 

Thank you for pointing me at the FAQ, especially in locating the relevant log files. I have verified all items on the FAQ as correct, however one site is still not able to get a Letsencrypt SSL. It is somehow coming up with the old server IP (38.99.70.248) for the site after DNS is changed and several hours passed:

Code:

[Wed Oct 30 02:18:08 PM UTC 2024] errordetail='38.99.70.248: Invalid response from http://www.vmsources.com/.well-known/acme-challenge/iTOhuAS_Luk_sdgsdhsfhsfhsfghsfghfshdfhgdhssghshshswbvc: 404'
[Wed Oct 30 02:18:08 PM UTC 2024] www.vmsources.com: Invalid status. Verification error details: 38.99.70.248: Invalid response from http://www.vmsources.com/.well-known/acme-challenge/iTOhuAS_Luk_sdgsdhsfhsfhsfghsfghfshdfhgdhssghshshswbvc: 404

My question is where is this IP cached or coming from? I have grep'ed and attempted to locate it but I cannot.
THX,
-John

 

OK, resolved. It was DNS /auto sub-domain www.