EPortal logon fails for some users

[robk]

We are having problems with our eportal server.

 

To ensure password lockout etc for audit we have set iis to require a domain logon before serving the eportal pages, staff then log on to eportal in the usual way. This works fine for most of our staff.....

 

Just some fail to log on, we can`t see any real pattern to who other than the problem moves with the member of staff, (roaming profiles are not turned on). Its only around 10% that can`t log in, but I just can`t understand why its happening.

 

Any suggestions (other than turn the security off, we have external access on this server so I can`t do that.)?

 

Rob K