Hi,
I have SuiteCRM on a computer with IP e.g. 1.2.3.4.
DNS points from e.g. crm.abc.com to 1.2.3.4.
When I try to login to SuiteCRM I can login if I try at
http://1.2.3.4/index.php?action=Login&module=Users
but cannot if I try at
http://crm.abc.com/index.php?action=Login&module=Users
What have I messed up?
Is it SuiteCRM config or web server config?
Thanks.
Definitely a web server config issue. Most likely. 
Have you set up the vhosts correctly for the “ServerName”?
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I concur it is a server configuration issue. What type of server are you using?