Domain DNS settings - A records no longer working

[#1]

I have a domain registered via Plunet, which I still use for emails, but I have a website hosted by another company. I had 2 a records set up ("www" and "<mydomainname>") which pointed to the host, and everything worked fine.

I've just moved to a different hosting company, so yesterday changed the a records to point to the other host.
This morning, when I try and ping my domain name, I'm getting

Ping request could not find host <mydomainname>. Please check the name and try again.

Any idea why this might be happening? Plusnet problem or host problem? I have 3 other domains hosted at the same place, but they are registered with 123reg and I just set up nameservers rather than a records.

TIA

[#2]

Better to use nslookup to confirm that the name can be resolved and that it resolves to the correct IP address.

Ping has to resolve the address and THEN connect to it.

[#3]

Hi, yes sorry I did that also:

A records

No A records found.

AAAA records

No AAAA records found.

CNAME record

No CNAME record found.

I did it last night so surely can't just be a "wait for it to trickle through" type problem?

[#4 · Accepted solution]

Have you double checked the guidance on the DNS record configuration page, notably...

You should make sure:

• That the canonical name (nominated on the right) is fully qualified (FQDN)
• If the canonical name doesn't have the full stop at the end, the DNS will add the Top Level Domain on again. This will make the domain name wrong. (E.g. 'house.domainname.co.uk' would become 'house.domain.co.uk.domain.co.uk').

[#5]

Thankyou @Townman , you've sorted me out again. Thought I'd copied them properly but missed that final .

[#6]

It is an easy omission to make. I suspected that ‘the dot’ might be the issue but could not recall the context … do I needed to check what (if any) guidance is provided. I think that what is there now has not always been there.

[#7]

I'm fairly sure you helped me with it when I first set it up some years ago 😁