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pooja adhikari

Please can any one advice on uegent baiss .

As we don't know your application, its configuration and the policies around it, there's no way to tell you what went wrong. It might be as simple as the wrong password, disabled cookies in their browsers, or similar.
It might be a malfunctioning LDAP. Who knows.

Check the logs while someone signs in. Try to replicate for different users - see if you find commonalities between them (unless it doesn't work for all of them). Check if someone recently deployed an updated version of some plugin.

And note that free forum support typically doesn't value (your) urgency.

But we're here to help - it's just hard to give an answer knowing nothing but the name about your system.

...and the logs? Read my whole message above and answer it. We need to know more than "not able to log in" to help you.

Wild guess: Those users have no, a duplicate or invalid Email. It's also possible that the username is invalid. As Olaf said, the logs should give you at least tell you, which field causes the problem.

I had issues with:
userids with only numbers
userids with special characters
empty email fields
emails with special characters (ldap usually doesn't care, if an email is valid)
emails with user@a-b-c.com adresses (There was a bug in Liferay, emails with two - separated by a single character were considered invalid)
...