Manual Suse openSUSE 12.2 (page 264 of 284) (English)

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to any action. Find more information about this topic in Section A.2.5, “Network

Problems” (page 257).

• If the system is congured to use Kerberos, the system's local time may have

drifted past the accepted variance with the Kerberos server time (this is typically

300 seconds). If NTP (network time protocol) is not working properly or local

NTP servers are not working, Kerberos authentication ceases to function because

it depends on common clock synchronization across the network.

• The system's authentication conguration is miscongured. Check the PAM

conguration les involved for any typographical errors or misordering of direc-

tives. For additional background information about PAM and the syntax of the

conguration les involved, refer to Chapter 2, Authentication with PAM (↑Secu-

rity Guide).

• The home partition is encrypted. Find more information about this topic in Sec-

tion A.2.4.3, “Login to Encrypted Home Partition Fails” (page 255).

In all cases that do not involve external network problems, the solution is to reboot

the system into single-user mode and repair the conguration before booting again

into operating mode and attempting to log in again. To boot into single-user mode:

1 Reboot the system. The boot screen appears, oering a prompt.

Enter 1 at the boot prompt to make the system boot into single-user mode.

Enter the username and password for root.

4 Make all the necessary changes.

Boot into the full multiuser and network mode by entering telinit 5 at the

command line.

A.2.4.2 Valid Username and Password Not Accepted

This is by far the most common problem users encounter, because there are many

reasons this can occur. Depending on whether you use local user management and

authentication or network authentication, login failures occur for dierent reasons.

Local user management can fail for the following reasons:

• The user may have entered the wrong password.

• The user's home directory containing the desktop conguration les is corrupted

or write protected.

• There may be problems with the X Window System authenticating this particular

user, especially if the user's home directory has been used with another Linux

distribution prior to installing the current one.

To locate the reason for a local login failure, proceed as follows:

252 Start-Up

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Suse openSUSE 12.2 Manual

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