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What do I enter when asked for FQDN (fully qualified domain name), for a PC that's not in a domain but in a WORKGROUP instead?

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Depends on what's asking. What's asking? – HopelessN00b Oct 17 '12 at 19:31
@HopelessN00b Lync server installation. I am trying to install it on a standalone server that can't have domain controller, and I can't join a domain hosted on another server, because it runs 2003. – Eternal21 Oct 17 '12 at 20:47
up vote 3 down vote accepted

Workgroup computers don't have an FQDN unless you specifically configure them to have one. They have only a NetBIOS (single label) name.

Also, don't confuse the Primary DNS suffix with the DNS suffix search list as assigned by DHCP because they're two different things.

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It would be PCNAME.

That's PCNAME plus a dot.

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For Windows PCs you can check with:

ipconfig /all


Host Name . . . . . . . . . . . . : PCNAME

Primary Dns Suffix . . . . . . . : local

FQDN = Hostname + Primary DNS Suffix

So in this case: PCNAME.local

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No, that's actually wrong. It's only PCNAME.local if your DNS suffix is local. – HopelessN00b Oct 17 '12 at 19:32
Obviousbly, when dns DNS suffix is empty, you'll get: PCNAME + null = PCNAME:) – Nicovs_be Sep 28 '14 at 8:19

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