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the cert is fine, it's a 3 month renewable let's encrypt one

firefox is fine with it

perhaps your ISP DNS blocks https://pomf2.lain.la/

this is what you should get from DNS (1.1.1.1 is cloudflare's dns server)

$ nslookup
 
> pomf2.lain.la
Server: 1.1.1.1
Address: 1.1.1.1#53

Non-authoritative answer:
Name: pomf2.lain.la
Address: 198.251.81.32
Name: pomf2.lain.la
Address: 198.251.81.242
Name: pomf2.lain.la
Address: 198.251.82.65
Name: pomf2.lain.la
Address: 198.251.82.91