I've already met these problems as well ;)

• 
  Sendmail: dsn=5.6.0, stat=Data format error 2006-09-25 18:18
  Add your external hostname in
  
  /etc/hosts
  
  Line 127.0.0.1 ...
  
  
• 
  Xen: Failed to get devices for domain virtual1 - [Solved] 2006-08-15 18:08
  

  Starting install...
  libvir: Xen Daemon error : POST operation failed: No such domain virtual1
  Failed to get devices for domain virtual1
  Traceback (most recent call last):
    File "/usr/sbin/xenguest-install.py", line 460, in ?
      main()
    File "/usr/sbin/xenguest-install.py", line 451, in main
      start_paravirt_install(name, ram, disk, mac, uuid, src, options.extra)
    File "/usr/sbin/xenguest-install.py", line 331, in start_paravirt_install
      dom = conn.createLinux(cfgxml, 0)
    File "/usr/lib/python2.4/site-packages/libvirt.py", line 233, in createLinux
      if ret is None:raise libvirtError('virDomainCreateLinux() failed')
  libvirt.libvirtError: virDomainCreateLinux() failed

  
  
  [ https://www.redhat.com/archives/libvir-list/... ] - [ Google ]
  
  

  Solution

  
  See the error messages in /var/log/xend-debug.log.
  I had too few memory on the host system. I have reduced the memory amount of the master system down to 200 MB:
  

  xm mem-set 0 200

  
  Then, re-launch the xenguest-install.py script and assign the necessary 256 MB for the guest system.
  
  
• 
  HylaFAX: modem on /dev/ttyS0 appears wedged 2006-07-31 12:22
  Automated E-Mail:
  
  The HylaFAX software thinks that there is a problem with the modem on device /dev/ttyS0 that needs attention; repeated attempts to initialize the modem have failed.
  
  Consult the server trace logs for more information on what is happening.
  
  You will be notified again after 5 minutes if the problem persists.
  
  - Stop HylaFAX
  - Check modem (e.g. with minicom serial0)
  
  
• 
  Apaches does not start anymore 2006-06-20 13:19
  [warn] _default_ VirtualHost overlap on port 443, the first has precedence
  
  
  Solution
  
  Check first, if you had doubled ssl*.conf's in your conf.d directory. This is usually the case when you manually make backup copies of your configuration file.
  
  See also:
  Google
  
  
• 
  Denied access to method in class (main) at SOAP/Lite.pm 2006-05-20 11:34
  Denied access to method in class (main) at SOAP/Lite.pm
  
  Solution
  
  Verify your SOAP attributes namespace and soapaction. Check the related WSDL file if availble.
  
  
  
• 
  PHP Notice: Undefined index: scheme 2006-05-18 17:17
  PHP Notice: Undefined index: scheme in /usr/share/pear/SOAP/Transport.php on line 42
  
  
  unsolved
  
  http://comments.gmane.org/gmane.comp.php.nusoap.general/2509
  
  
  
• 
  mysqld does not start 2006-05-16 17:07
  InnoDB: Error: auto-extending data file ./ibdata1 is of a different size
  
  Solution:
  1.) Add (virtual) memory
  2.) Delete ibdata1 (be sure).
  3.) Start again
  
  
• 
  PHP Fatal error: Call to undefined function imagejpeg() 2006-05-08 11:55
  See also: XTCommerce
  
  Note: JPEG support is only available if PHP was compiled against GD-1.8 or later.
  
  See phpinfo(), section gd: JPG Support enabled
  
  If not:
  Compile PHP:
  --with-gd --with-jpeg-dir=/usr
  
  php.net/manual/en/function.imagejpeg.php
  
  
• 
  PHP: Call to undefined function mysql_connect() 2005-11-28 16:17
  Fatal error: Call to undefined function mysql_connect() in /usr/local/apache2/htdocs/testdb_mysql.php on line 58
  
  

  Solution:

  Please compile php --with-mysql or install the mysql.so module
  
  Then, restart Apache
  
  
• 
  PHP Fatal error: Allowed memory size of 20971520 bytes exhausted 2005-11-23 16:24
  [client a.b.c.d] PHP Fatal error: Allowed memory size of 20971520 bytes exhausted (tried to allocate 1
  8277511 bytes) in /var/www/html/wiki/includes/Sanitizer.php on line 797, referer: http://sunri1.example.net/wiki
  /index.php/Special:Upload
  
  

  Solution:

  Upload Large Files
  
  
• 
  PHP: Possible file upload attack! 2005-11-23 14:39
  Can't upload large files (e.g. gt 8 MB)
  Message Possible file upload attack!
  
  

  Solution

  /etc/php.ini:
  
  ; Maximum size of POST data that PHP will accept.
  ; X post_max_size = 8M
  post_max_size = 33M
  
  
• 
  newaliases / aliases.db out of date 2005-11-08 08:41
  sendmail[13430]: alias database /etc/aliases.db out of date
  
  This might have the case you installed courier imap on this host and its installation has replaced newaliases by an alternative that rises a conflict with a running "real" Sendmail.
  
  

  Solution

  Just make sure you are using the newaliases that points to Sendmail by (re-)creating this symlink:
  rm -f /usr/bin/newaliases
  ln -s /usr/sbin/sendmail /usr/bin/newaliases
  
  
• 
  Java Emailer: NoClassDefFoundError 2005-09-26 14:14
  NoClassDefFoundError: javax/activation/Datasource
  
  
• 
  Kernel Errors Present 2005-06-21 11:07
  > WARNING: Kernel Errors Present
  > hda: task_no_data_intr: error=0x04 { DriveStat...: 1Time(s)
  > hda: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error
  > }...: 1Time(s)
  > hdb: task_no_data_intr: error=0x04 { DriveStat...: 1Time(s)
  > hdb: task_no_data_intr: status=0x51 { DriveReady SeekComplete Error
  > }...: 1Time(s)
  
  What does this mean?
  
  It means the controller sent the drive a command it doesn't understand, and the drive returned "Eh ?"
  This happens for eg when we try to use modern features
  like SMART on old drives that don't support them.
  
  
• 
  Mysql Connect fails «does not support authentication protocol» 2005-05-08 16:32
  Problem: Client does not support authentication protocol requested by server; consider upgrading MySQL client
  
  

  Cause:

  MySQL's password hashing has been changed since mysql 4.1 (41 bytes instead of 16 bytes length)
  
  PASSWORD(), GRANT, and SET PASSWORD generate long hashes unless the server was started with the --old-passwords option. That option forces the server to generate short password hashes instead.
  
  

  2 Solutions

  a) Start mysqld_safe with additional option --old-passwords.
  You may then set passwords as usual with:
  mysql> SET PASSWORD FOR 'apache'@'localhost' = PASSWORD('foo');
  
  or b) Use the "OLD_" key:
  mysql> SET PASSWORD FOR 'apache'@'localhost' = OLD_PASSWORD('foo');
  
  http://dev.mysql.com/doc/mysql/en/Password_hashing.html
  http://dev.mysql.com/doc/mysql/en/Old_client.html
  
  
• 
  Sendmail: How To Set the hostname? 2005-04-16 00:38
  

  Problem: You want to see the real hostname at Sendmail's welcome message instead of «localhost.localdomain»

  # telnet localhost 25
  Trying 127.0.0.1...
  Connected to foo.example.com (127.0.0.1).
  Escape character is '^]'.
  220 localhost.localdomain ESMTP Sendmail 8.13.1/8.13.1; Sun, 17 Apr 2005 00:37:56 +0200
  quit
  

  Solution

  vi /etc/hosts
  

  # XX Hint: First listed hostnames are preferred
  127.0.0.1               foo.example.com localhost.localdomain localhost
  192.168.1.201   foo.example.com

  
  
  
• 
  Starting httpd with warning 2005-04-04 12:09
  Starting httpd: httpd: Could not determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
  
  Solution:
  Set fully qualfied hostname
  
  
• 
  Cannot sign my self-created certificate 2005-03-25 17:16
  Error Message: failed to update database
  TXT_DB error number 2
  
  Reason is you already signed that common name.
  
  
• 
  openssl: unable to write 'random state' 2005-03-25 14:16
  See openssl FAQ Page
  
  
• 
  resolv.conf automatically changes after reboot 2005-01-30 10:42
  How to prevent updating/replacing resolv.conf
  
  vi /etc/sysconfig/networking/profiles/default/ifcfg-eth0
  
  Add this:
  
  # Do not update/replace resolv.conf:
  PEERDNS=no
  
  
• 
  No Sound on Linux - DELL OPTIPLEX GX200 2004-11-29 10:59
  

  Check/edit your /etc/modprobe.conf

  
  
  

  Add these 3 lines if necessary

  
  alias snd-card-0 snd-intel8x0
  
  install snd-intel8x0 /sbin/modprobe --ignore-install snd-intel8x0 && /usr/sbin/alsactl restore >/dev/null 2>&1 [CHR_PIPE][CHR_PIPE] :
  
  remove snd-intel8x0 { /usr/sbin/alsactl store >/dev/null 2>&1 [CHR_PIPE][CHR_PIPE] : ; }; /sbin/modprobe -r --ignore-remove snd-intel8x0
  
  
  
• 
  Is there a procmail recipe to move a message into an Imap folder? 2004-11-18 00:13
  Solved. Have found this page that didn't help.
  
  
• 
  readline library not found 2004-09-21 16:28
  configure: error: readline library not found
  If you have readline already installed, see config.log for details on the
  failure. It is possible the compiler isn't looking in the proper directory.
  Use --without-readline to disable readline support.
  
  
  
• 
  Can display only 20x80 characters 2004-06-09 11:21
  Problem:
  
  vi and man is limited to show only 20x80 characters instead of stretching the screen to the edges
  
  Solution:
  
  You may need to set the screen size, via "stty rows num_rows columns num_cols"
  
  Check the current setting of your terminal:
  
  stty -a[CHR_PIPE]grep rows
  stty rows 50 columns 100
  
  You might save this shell command in your .bash_profile if necessary.
  
  See also:
  http://www.mail-archive.com/linux-development-apps@senator-bedfellow.mit.edu/msg01065.html
  
  See also #2:
  
  echo $LINES
  echo $COLUMNS
  
  Google: [ groups.google #1 ] - [ groups.google #2 ] - [ groups.google #3 ]
  
  
• 
  Apache doesn't come up again after installation of SSL certificate 2004-05-31 00:03
  routines:X509_check_private_key:key values mismatch
  
  -> The "modulus" and "public exponent" portions in the key and the certificate
  must match exactly
  
  openssl x509 -noout -text -in yourdomain.crt
  openssl rsa -noout -text -in yourserver.key
  
  
• 
  procmail: Attempt to execute 2004-05-07 17:09
  #ifdef RESTRICT_EXEC
  if(erestrict&&uid>=RESTRICT_EXEC)
  { syslog(LOG_ERR,slogstr,"Attempt to execute",newname);
  nlog("No permission to execute");logqnl(newname);
  return;
  }
  #endif
  
  /*#define RESTRICT_EXEC 100 /* uncomment to prevent users with uids equal
  or higher than RESTRICT_EXEC from
  executing programs from within their .procmailrc files (this
  restriction does not apply to the /etc/procmailrc and
  /etc/procmailrcs files) */
  
  
• 
  "RunAsGid for MSP ignored" error 2004-03-25 22:55
  "RunAsGid for MSP ignored" error
  
  When sending mail through Sendmail's mail user agent or another mail user agent (ex. mutt), I received the following error:
  
  WARNING: RunAsGid for MSP ignored, check group ids (egid=8809, want=1)
  can not write to queue directory /var/spool/clientmqueue/ (RunAsGid=0, required=8809): Permission denied
  
  Solution
  
  
• 
  rpm --rebuilddb (RedHat 9) 2004-03-04 18:42
  Problem: error: db4 error(16) from dbenv->remove: Device or resource busy
  
  Solution:
  It's a harmless albeit annoying bug. Ignore it.
  
  
  
• 
  PostgreSQL: too many clients already 2004-01-24 01:29
  unable to connect to PostgreSQL server: Sorry, too many clients already
  
  Apache Log:
  [Sat Jan 24 21:00:00 2004] [error] [client 64.235.238.142] mod_auth_pgsql database connection error reset failed FATAL: Sorry, too many clients already
  
  Solution:
  vi /usr/local/pgsql/data/postgresql.conf
  
  Increase the value of the key max_connections from 32 to 64.
  
  shared_buffers = 128 # min max_connections*2 or 16, 8KB each
  
  
• 
  Sendmail 2003-12-15 14:58
  

  Status: 5.1.3
  Diagnostic-Code: SMTP; 553  unable to verify address

  
  
  Solution:
  Use the -r option:
  /usr/sbin/sendmail -r mailnull@valid_domain
  
  
• 
  Sendmail 2003-12-09 21:00
  stat=Operating system error
  
  Solution: Check if the smrsh binary is executable for the Sendmail process!
  
  
• 
  eth0/DHCP Warning 2003-11-19 14:22
  [dhpd430] infinite IP address lease time. exiting
  
  To fix this, I edited /etc/sysconfig/network-scripts/ifcfg-eth0 and added
  
  DHCPCDARGS='-l 86400 -t 5'
  
  This causes dhcpcd to ask the server for a lease time of 24 hours. The server grants the request, and dhcpcd doesn't die. This makes life more predictable.
  
  See also http://www.scd.ucar.edu/nets/intro/staff/siemsen/tools/dhcpcd.html
  
  
• 
  Installation of vi improved failed 2003-07-06 22:46
  libgpm.so.1 is needed by vim-enhanced-6.0-7.13
  
  

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