You have other DNS issues. http://leafdns.com/index.cgi?testid=5C80A8EF
You don’t need ns2. if you are using Linode as your slave DNS.
Do you have AXFR in place to transfer between Linode and your ns1?
No doubt there are other DNS issues, which need to be resolved before you get a vaild SSL from LE.
[1]. There is no transfer in place. I transferred hosting in 2019. That’s 2-years ago from Siteground to LinodeVPS
[2]. And the domain healthsmartnutra[dot]com is registered with another domain registrar.
After transfer from Siteground to Linode-VPS, I changed DNS to ns1.linode.com and ns2.linode.com on the 'Domain Registrars Dashboard."
There was no problem after moving from Siteground to Linode.
And I always used the 'domain registrar’s free DNS service."
[3]. On Linode, I used Vesta CP without any DNS issue.
VestaCP has security breach warning and.I moved to premium Webuzo-Panel.
There was no DNS issue at all even after when I moved to Webuzo Panel.
[4]. A week ago, everything was working fine with premium Webuzo Panel.
Problem started with Webuzo panel when I received the notification for MySQL 8 unpdate.
I did update inside the Webuzo-Dashboard and WordPress site went down.
[5]. Webuzo reps in India could not assist me. Luck I had a previous backup.
[6]. This week just yesterday, I decided to move over to and install HestiaCP and tryout.
Till last-night and today facing the HestiaCP Login-Panel not able to get LE-ssl.
On VestaCp and Webuzo I used LE-ssl without any issue.
It seems that the issue is with ‘HestiaCP’ and possibly NGINX-SSL on HestiaCP.
The domain has captured LE-ssl fine. But HestiaCP Login-panel has failed.
I live in Australia, and whole of yesterday plus whole of today I have been in search for the solution. Documents did not help.
Swap space can be though as a “safety net”. In the case a program needs more RAM that what is available, swap will be used as the “safety net”. If swap does not exist, a process will be terminated to free some RAM.
If you can be sure that no program will ever need more RAM than what is available, then you don’t need swap. In any other case you could have some swap, “just in case”. Personally, I wouldn’t go for more than 1GB swap in a well memory sized system. But I’m not an expert on this.