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Hello, the ":" is a special character for Unix. (E.g. it's the column delimiter in /etc/passwd and friends.) So Unix forbids the usage of ":" in user names. POSIX defines (http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_426): --- To be portable across systems conforming to IEEE Std 1003.1-2001, the value is composed of characters from the portable filename character set. --- This portable character set is defined as (http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276): --- The set of characters from which portable filenames are constructed. A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5 6 7 8 9 . _ - The last three characters are the period, underscore, and hyphen characters, respectively. ---So LDAP allows ":" in uid (because it has DirectoryString syntax) but the application (Unix/POSIX) forbids it. Regards, Jochen. Am 23.02.2011 11:39, schrieb Vinay Kalkoti: But, the user account with "test_user:IT" is not able to login. I have setup an OpenLDAP server and am using OpenLDAP client on SLES machines. SSH or "su - test_user:IT" fails. I see the following logs in /var/log/messages file. Feb 23 11:09:41 server sshd[20549]: Invalid user test_user from 10.34.3.94 Feb 23 11:09:44 sverver sshd[20549]: error: PAM: User not known to the underlying authentication module for illegal user test_user from 10.34.3.94 *** Note that the logs just mention test_user instead of test_user:IT Vinay On Wed, Feb 23, 2011 at 2:37 PM, Marc Patermann <hans.moser@ofd-z.niedersachsen.de> wrote:Vinay, Vinay Kalkoti schrieb am 23.02.2011 09:10 Uhr:I wanted to know what all complex characters can be included for an UID attribute. I have the following user names (uid). Please let me know which which of the following uid's are invalid - test_user: IT (LOC) sup_12$ test_user:IT(LOC) test_user-IT test_user IT test_user:IT test_user(IT) test_user.IT test_user/IT test_user/IT test_user#IT test_user*IT test_user@ITIMHO from the ldap point of view this is all totally valid. As long as it is encoded in UTF-8. According to this http://www.andrew.cmu.edu/user/dd26/ldap.akbkhome.com/attribute/uid.html the syntax of uid is Directory String which does not limit you either. Your application using uid may or may not have stricter rules than that... Marc |