Basic access to the https://ip/cmuser. One user workes great but another does't. The server has LDAP to the AD and this seems to work great. I can do manual sync and the changes is done.
Is there a log where I can see the activity?
as Brian correctly pointed out, your users need to be a member of a group to access the CCMUser pages. The group must have the correct role attributed to it.
The role that provides that access is the "Standard CCMUSER Administration" role. There's a built in group that has this role associated already and that group is the "Standard CCM End Users" Group.
if you've set up the LDAP authentication to AD the CCMUser page login is authenticated against the AD Global Catalog server so you might want to see if there's anything in the logs there
I've also previously seen problems logging onto the ccmuser pages where the username was case sensitive, so it might be worth checking that.
What sort of error are you getting when the user attempts to login? What version of CUCM are you running?