Question (VPS) Cloudflare, Gmail and Other Plesk Panel 8443 (2 minutes - slow read)

[kaw.one]

Server operating system version

Ubuntu 22.04

Plesk version and microupdate number

18.0.57 Update #4

Hi everyone, brothers, sisters, gurus, masters and sifus...

I've searched for solution since a few days ago but found nothing so I had to register acc to start posting.
Here's some question and answer (that I found with reading + trial and error while writing this post).

1. (Question) Cloudflare DNS Proxy issue:
After on CloudFlare's, I can't access my server.domainname.ext Plesk panel.
It keeps redirecting to Plesk panel login page, right after I pressed 'enter / login'.
Error for server.domainname.ext or server.domainname.ext:8443 or server.domainname.ext/login_up.php.

On CloudFlare:-
- Most DNSes are Proxied (Orange cloud)
- CloudFlare's SSL is set to Full (Strict)

On Plesk:-
- VPS was renamed under server.domainname.ext
- The 'domainname.ext' has its own DNS zone
- The 'domainname.ext' is not in use. Dedicatedly meant for VPS only
- Domain Setting: <domainname.ext> forward to <server.domainname.ext>
- Let's Encrypt (Wildcard) is actively running for domainname.ext
- All CloudFlare's iPv4 and iPv6 have been whitelisted
- NGINX is actively running
- Plesk's CloudFlare DNS extension is actively sync

On Device System:
- Cleared browser's caches and cookies
- Tried 3 different WiFis

Temporary solution:
- I've changed most DNSes to 'DNS only' (Grey cloud) and everything working fine like it used to be.
- If I change most DNSes to 'Proxied' (Orange cloud), the Plesk panel login page redirect happens again.

// How do I fix and overcome this issue?
// Should I delete / remove '<domainname.ext> forward to <server.domainname.ext>'
// Should I create a subdomain for <server.domainname.ext> and Let's Encrypt it?
// Should I stop using Let's Encrypt on <domainname.ext> and generate one from CloudFlare?

.
.

2. (Question but SOLVED) Gmail POP3 error:
For 'Check mail from other accounts' in Gmail's setting.
It shows 'Connection timed out: There may be a problem with the settings you added.' on 995.
- Default_DomainKey DKIM, DomainKey and DMARC added to both CloudFlare & Plesk DNS record
- 'A : mail' on CloudFlare's DNS Record changed to 'DNS only' (Grey cloud)
- Email Routing to Gmail account (on CloudFlare's Email setting) - Optional
// All working fine now.

.
.

3. (Question but SOLVED) <otherdomainname.ext>:8443 issue:
Always not secured and need to press 'Advanced' then 'Continue to <otherdomainname.ext> (unsafe)'
- Let's Encrypt (Wildcard) is activated on <otherdomainname.ext>
- Good Answer: https://support.plesk.com/hc/en-us/articles/12388004435607
- Best Answer: https://support.plesk.com/hc/en-us/articles/12377772259223
// I accept it but please help to vote HERE. Thank you!

 

[kaw.one]

// Should I create a subdomain for <server.domainname.ext> and Let's Encrypt it?

Definitely not a good option hahaha I had wasted half an hour just to recover back.