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Archive for the 'Troubleshooting' Category

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• Linux Find Out If the PCIe / AGP / VGA Driver IS Installed OR NOT [ Radeon X1550 64 bit ] :

  I’ve ATI Radeon VGA [X1550 64 bit] card. How do I find find out if driver is installed or not under Linux distribution?

• Postfix SASL ERROR: Password not accepted from server: 535 5.7.0 Error: authentication failed: authentication failure :

  Q. I’ve recently changed email user account password using passwd command, for one my postfix email server which requires SMTP authentication before sending an email. Now following error is logged into my /var/log/maillog file:
  ERROR: Password not accepted from server: 535 5.7.0 Error: authentication failed: authentication failure
  How do I solve this problem under Red Hat [...]

• Best Method To Reboot Remote Linux / Windows / UNIX Server :

  Q. I’ve couple of Linux / Windows server hosted in remote data center? My ISP provides following option for rebooting the box:
  a) Graceful shutdown command
  b) An IPMI reboot
  c) A power strip
  Which one is the best way to reboot server and why?

• How To Find and Overcome Shell Command Line Length Limitations :

  While using mv or rm command I get command line length error (Argument list too long error). How do I find out current running shell command line length limitations? How do I overcomes these limitations while writing UNIX / BSD / Linux shell utilities?

• Ubuntu Linux Configure Gateway / Default Routing IP Address :

  How do I configure default router or gateway IP address under Ubuntu Linux / Debian Linux? How do I change default router / gateway IP under Ubuntu Linux?

• Linux yum command skip updating packages :

  How can I skip any packages updating while using yum update command in CentOS / RedHat / RHEL / Fedora Linux server system?

• ORA-12154: TNS:could not resolve the connect identifier specified Error and Solution :

  Q. My Oracle XE installation was working fine, but today I’m getting an error - which read as follows under Ubuntu Linux :
  ORA-12154: TNS:could not resolve the connect identifier specified
  How do I fix this problem without reinstalling Oracle?

• Your PHP installation appears to be missing the MySQL extension which is required by WordPress :

  How do I fix error - “Your PHP installation appears to be missing the MySQL extension which is required by WordPress” under Debian Linux Apache 2 server?

• Apache Log POST Data To A Log File :

  How do I log POST data submitted by our user registration form to a log file under Debian Linux Apache 2 Web Server?

• How To Restart Linux NFS Server Properly When Network Become Unavailable :

  Q. How do I restart NFS server when network link goes down between two servers or NFS client / server under CentOS 4.x / RHEL / CentOS Linux 5.x? Forceful umount command result into more problems such as unresponsive NFS server and cold reboot only solves my problem.

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