Do I have to re-boot?

[CharmingNathan]

Hello everyone,

I am a Linux Newbie, who has managed to get his CentOS 6 Server up and running with the help of this Forum - it runs D.N.S., Mail, Web, and a piece of software for collecting listener statistics.

I have been working on it for most of the last few days, via TightV.N.C. and last night, I could no longer F.T.P., receiving the error message that "warning: can't get client address: Connection reset by peer". Shortly afterwards I was unable to login via TightV.N.C., and this morning I attached a monitor to the server and saw the same affect: with any keyboard and/or mouse input, the Desktop backgound flashes on and off a few times, then returns to black.

From what I can ascertain the Web and Mail Server side appear to be down...although I have received E-Mail's, presumably generated by the server:

Code: Select all

abrt_version:   2.0.8
cgroup:         
cmdline:        /usr/libexec/gnome-screensaver-dialog --status-message= --enable-switch
executable:     /usr/libexec/gnome-screensaver-dialog
kernel:         2.6.32-431.11.2.el6.i686
last_occurrence: 1428618836
pid:            23359
pwd:            /
time:           Thu 09 Apr 2015 11:33:56 PM BST
uid:            500
username:       Nathan

sosreport.tar.xz: Binary file, 6913924 bytes

environ:
:HOSTNAME=01may-8vydtklay.default
:IMSETTINGS_INTEGRATE_DESKTOP=yes
:SHELL=/bin/bash
:TERM=dumb
:HISTSIZE=1000
:XDG_SESSION_COOKIE=dd9565af374fadd158279ddb0000001f-1422835368.806974-106483984
:QTDIR=/usr/lib/qt-3.3
:QTINC=/usr/lib/qt-3.3/include
:IMSETTINGS_MODULE=none
:USER=Nathan
:GNOME_KEYRING_SOCKET=/tmp/keyring-9m6SAO/socket
:USERNAME=Nathan
:MAIL=/var/spool/mail/Nathan
:PATH=/usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/Nathan/bin:/usr/libexec/gnome-screensaver
:DESKTOP_SESSION=gnome
:QT_IM_MODULE=xim
:PWD=/home/Nathan
:XMODIFIERS=@im=none
:GDM_KEYBOARD_LAYOUT=gb
:LANG=en_US.UTF-8
:GNOME_KEYRING_PID=2023
:GDM_LANG=en_US.UTF-8
:GDMSESSION=gnome
:SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
:HISTCONTROL=ignoredups
:HOME=/home/Nathan
:SHLVL=1
:LOGNAME=Nathan
:QTLIB=/usr/lib/qt-3.3/lib
:CVS_RSH=ssh
:DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-7bY0sCdd5e,guid=0913baf155a44f7c5c4a4fe2000000c7
:'LESSOPEN=|/usr/bin/lesspipe.sh %s'
:WINDOWPATH=1
:DISPLAY=:0.0
:G_BROKEN_FILENAMES=1
:XAUTHORITY=/var/run/gdm/auth-for-Nathan-tWh3cC/database
:_=/usr/bin/gnome-session
:GNOME_DESKTOP_SESSION_ID=this-is-deprecated
:SESSION_MANAGER=local/unix:@/tmp/.ICE-unix/2033,unix/unix:/tmp/.ICE-unix/2033
:ORBIT_SOCKETDIR=/tmp/orbit-Nathan
:GTK_RC_FILES=/etc/gtk/gtkrc:/home/Nathan/.gtkrc-1.2-gnome2
:SSH_AUTH_SOCK=/tmp/keyring-9m6SAO/socket.ssh
:DESKTOP_AUTOSTART_ID=101b83dd81dfaac82e142283536972790400000020330005

limits:
:Limit                     Soft Limit           Hard Limit           Units     
:Max cpu time              unlimited            unlimited            seconds   
:Max file size             unlimited            unlimited            bytes     
:Max data size             unlimited            unlimited            bytes     
:Max stack size            10485760             unlimited            bytes     
:Max core file size        0                    unlimited            bytes     
:Max resident set          unlimited            unlimited            bytes     
:Max processes             1024                 7846                 processes 
:Max open files            1024                 4096                 files     
:Max locked memory         65536                65536                bytes     
:Max address space         unlimited            unlimited            bytes     
:Max file locks            unlimited            unlimited            locks     
:Max pending signals       7846                 7846                 signals   
:Max msgqueue size         819200               819200               bytes     
:Max nice priority         0                    0                    
:Max realtime priority     0                    0                    
:Max realtime timeout      unlimited            unlimited            us        

maps:
:00101000-00236000 r-xp 00000000 fd:00 1859622    /usr/lib/libX11.so.6.3.0
:00236000-0023a000 rw-p 00134000 fd:00 1859622    /usr/lib/libX11.so.6.3.0
:0023c000-0024c000 r-xp 00000000 fd:00 1848510    /usr/lib/libgnomekbdui.so.4.0.0
:0024c000-0024d000 rw-p 0000f000 fd:00 1848510    /usr/lib/libgnomekbdui.so.4.0.0
:0024d000-00251000 r-xp 00000000 fd:00 2234957    /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
:00251000-00252000 rw-p 00004000 fd:00 2234957    /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so
:00278000-00279000 r-xp 00000000 00:00 0          [vdso]
:00279000-002ba000 r-xp 00000000 fd:00 1855911    /usr/lib/libibus.so.2.0.0
:002ba000-002bc000 rw-p 00040000 fd:00 1855911    /usr/lib/libibus.so.2.0.0
:00366000-00372000 r-xp 00000000 fd:00 3015707    /lib/libnss_files-2.12.so
:00372000-00373000 r--p 0000b000 fd:00 3015707    /lib/libnss_files-2.12.so
:00373000-00374000 rw-p 0000c000 fd:00 3015707    /lib/libnss_files-2.12.so
:003af000-003b1000 r-xp 00000000 fd:00 2236032    /usr/lib/gtk-2.0/modules/libpk-gtk-module.so
:003b1000-003b2000 rw-p 00002000 fd:00 2236032    /usr/lib/gtk-2.0/modules/libpk-gtk-module.so
:0047b000-004a6000 r-xp 00000000 fd:00 2103325    /usr/lib/gtk-2.0/2.10.0/engines/libclearlooks.so
:004a6000-004a7000 rw-p 0002b000 fd:00 2103325    /usr/lib/gtk-2.0/2.10.0/engines/libclearlooks.so
:0058e000-00590000 r-xp 00000000 fd:00 1848343    /usr/lib/libXss.so.1.0.0
:00590000-00591000 rw-p 00001000 fd:00 1848343    /usr/lib/libXss.so.1.0.0
:00595000-005be000 r-xp 00000000 fd:00 1860230    /usr/lib/libpangoft2-1.0.so.0.2800.1
:005be000-005bf000 rw-p 00029000 fd:00 1860230    /usr/lib/libpangoft2-1.0.so.0.2800.1
:006f4000-006ff000 r-xp 00000000 fd:00 1860421    /usr/lib/libpangocairo-1.0.so.0.2800.1
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:00707000-0070f000 r-xp 00000000 fd:00 1860419    /usr/lib/libXrender.so.1.3.0
:0070f000-00710000 rw-p 00008000 fd:00 1860419    /usr/lib/libXrender.so.1.3.0
:00782000-00784000 r-xp 00000000 fd:00 1860232    /usr/lib/libXinerama.so.1.0.0
:00784000-00785000 rw-p 00001000 fd:00 1860232    /usr/lib/libXinerama.so.1.0.0
:00787000-007a5000 r-xp 00000000 fd:00 1860235    /usr/lib/libgdk_pixbuf-2.0.so.0.2000.1
:007a5000-007a6000 rw-p 0001d000 fd:00 1860235    /usr/lib/libgdk_pixbuf-2.0.so.0.2000.1
:007a8000-007b1000 r-xp 00000000 fd:00 1860422    /usr/lib/libXrandr.so.2.2.0
:007b1000-007b2000 rw-p 00008000 fd:00 1860422    /usr/lib/libXrandr.so.2.2.0
:007b4000-007b6000 r-xp 00000000 fd:00 1859649    /usr/lib/libXdamage.so.1.1.0
:007b6000-007b7000 rw-p 00001000 fd:00 1859649    /usr/lib/libXdamage.so.1.1.0
:007b9000-007c2000 r-xp 00000000 fd:00 1860423    /usr/lib/libXcursor.so.1.0.2
:007c2000-007c3000 rw-p 00008000 fd:00 1860423    /usr/lib/libXcursor.so.1.0.2
:007c5000-007c7000 r-xp 00000000 fd:00 1859648    /usr/lib/libXcomposite.so.1.0.0
:007c7000-007c8000 rw-p 00001000 fd:00 1859648    /usr/lib/libXcomposite.so.1.0.0
:007ca000-007ce000 r-xp 00000000 fd:00 3021474    /lib/libuuid.so.1.3.0
:007ce000-007cf000 rw-p 00003000 fd:00 3021474    /lib/libuuid.so.1.3.0
:007d2000-007f0000 r-xp 00000000 fd:00 3021220    /lib/ld-2.12.so
:007f0000-007f1000 r--p 0001d000 fd:00 3021220    /lib/ld-2.12.so
:007f1000-007f2000 rw-p 0001e000 fd:00 3021220    /lib/ld-2.12.so
:007f8000-00989000 r-xp 00000000 fd:00 3021451    /lib/libc-2.12.so
:00989000-0098b000 r--p 00191000 fd:00 3021451    /lib/libc-2.12.so
:0098b000-0098c000 rw-p 00193000 fd:00 3021451    /lib/libc-2.12.so
:0098c000-0098f000 rw-p 00000000 00:00 0 
:00991000-00994000 r-xp 00000000 fd:00 3021454    /lib/libdl-2.12.so
:00994000-00995000 r--p 00002000 fd:00 3021454    /lib/libdl-2.12.so
:00995000-00996000 rw-p 00003000 fd:00 3021454    /lib/libdl-2.12.so
:00998000-009af000 r-xp 00000000 fd:00 3021452    /lib/libpthread-2.12.so
:009af000-009b0000 r--p 00016000 fd:00 3021452    /lib/libpthread-2.12.so
:009b0000-009b1000 rw-p 00017000 fd:00 3021452    /lib/libpthread-2.12.so
:009b1000-009b3000 rw-p 00000000 00:00 0 
:009b5000-009bc000 r-xp 00000000 fd:00 3021453    /lib/librt-2.12.so
:009bc000-009bd000 r--p 00006000 fd:00 3021453    /lib/librt-2.12.so
:009bd000-009be000 rw-p 00007000 fd:00 3021453    /lib/librt-2.12.so
:009c0000-009e8000 r-xp 00000000 fd:00 3021475    /lib/libm-2.12.so
:009e8000-009e9000 r--p 00027000 fd:00 3021475    /lib/libm-2.12.so
:009e9000-009ea000 rw-p 00028000 fd:00 3021475    /lib/libm-2.12.so
:009ec000-009fe000 r-xp 00000000 fd:00 3021471    /lib/libz.so.1.2.3
:009fe000-009ff000 r--p 00011000 fd:00 3021471    /lib/libz.so.1.2.3
:009ff000-00a00000 rw-p 00012000 fd:00 3021471    /lib/libz.so.1.2.3
:00a02000-00b0d000 r-xp 00000000 fd:00 3021467    /lib/libglib-2.0.so.0.2600.1
:00b0d000-00b0e000 rw-p 0010b000 fd:00 3021467    /lib/libglib-2.0.so.0.2600.1
:00b10000-00b2d000 r-xp 00000000 fd:00 3021460    /lib/libselinux.so.1
:00b2d000-00b2e000 r--p 0001c000 fd:00 3021460    /lib/libselinux.so.1
:00b2e000-00b2f000 rw-p 0001d000 fd:00 3021460    /lib/libselinux.so.1
:00b31000-00b46000 r-xp 00000000 fd:00 3021459    /lib/libresolv-2.12.so
:00b46000-00b47000 ---p 00015000 fd:00 3021459    /lib/libresolv-2.12.so
:00b47000-00b48000 r--p 00015000 fd:00 3021459    /lib/libresolv-2.12.so
:00b48000-00b49000 rw-p 00016000 fd:00 3021459    /lib/libresolv-2.12.so
:00b49000-00b4b000 rw-p 00000000 00:00 0 
:00b4d000-00b92000 r-xp 00000000 fd:00 3021473    /lib/libdbus-1.so.3.4.0
:00b92000-00b93000 r--p 00044000 fd:00 3021473    /lib/libdbus-1.so.3.4.0
:00b93000-00b94000 rw-p 00045000 fd:00 3021473    /lib/libdbus-1.so.3.4.0
:00b96000-00b9a000 r-xp 00000000 fd:00 3021468    /lib/libgthread-2.0.so.0.2600.1
:00b9a000-00b9b000 rw-p 00003000 fd:00 3021468    /lib/libgthread-2.0.so.0.2600.1
:00b9d000-00be7000 r-xp 00000000 fd:00 3021469    /lib/libgobject-2.0.so.0.2600.1
:00be7000-00be9000 rw-p 00049000 fd:00 3021469    /lib/libgobject-2.0.so.0.2600.1
:00beb000-00bee000 r-xp 00000000 fd:00 3021470    /lib/libgmodule-2.0.so.0.2600.1
:00bee000-00bef000 rw-p 00002000 fd:00 3021470    /lib/libgmodule-2.0.so.0.2600.1
:00bf1000-00cf8000 r-xp 00000000 fd:00 3021472    /lib/libgio-2.0.so.0.2600.1
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:00dad000-00dae000 rw-p 00026000 fd:00 1859639    /usr/lib/libpng12.so.0.49.0
:00dba000-00dc1000 r-xp 00000000 fd:00 1841255    /usr/lib/libgnomekbd.so.4.0.0
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:034f7000-034fe000 r-xp 00000000 fd:00 3021456    /lib/libcrypt-2.12.so
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:0565e000-056f2000 r-xp 00000000 fd:00 1860226    /usr/lib/libfreetype.so.6.3.22
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:056f8000-05b90000 r-xp 00000000 fd:00 1860425    /usr/lib/libgtk-x11-2.0.so.0.2000.1
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:05b96000-05b97000 rw-p 00000000 00:00 0 
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:b754e000-b7554000 r--s 00000000 fd:02 1313796    /home/Nathan/.fontconfig/b79f3aaa7d385a141ab53ec885cc22a8-le32d4.cache-3
:b7554000-b7556000 r--s 00000000 fd:02 1313795    /home/Nathan/.fontconfig/0b1bcc92b4d25cc154d77dafe3bceaa0-le32d4.cache-3
:b7556000-b7558000 r--s 00000000 fd:02 1313794    /home/Nathan/.fontconfig/2e1514a9fdd499050989183bb65136db-le32d4.cache-3
:b7558000-b755a000 r--s 00000000 fd:02 1313793    /home/Nathan/.fontconfig/5c755b2f27115486aa6359c84dd3cbda-le32d4.cache-3
:b755a000-b755b000 r--s 00000000 fd:02 1313792    /home/Nathan/.fontconfig/b966c23d19cce9e9a98d55765cf2a0c7-le32d4.cache-3
:b755b000-b755c000 r--s 00000000 fd:02 1313791    /home/Nathan/.fontconfig/3f821257dd33660ba7bbb45c32deb84c-le32d4.cache-3
:b755c000-b755e000 r--s 00000000 fd:02 1313790    /home/Nathan/.fontconfig/830f035fa84a65ce80e050178dbb630d-le32d4.cache-3
:b755e000-b755f000 r--s 00000000 fd:02 1313789    /home/Nathan/.fontconfig/81a173283b451552b599cfaafd6236bd-le32d4.cache-3
:b755f000-b7560000 r--s 00000000 fd:02 1313788    /home/Nathan/.fontconfig/ac68f755438cc3dc5a526084839fc7ca-le32d4.cache-3
:b7560000-b7561000 r--s 00000000 fd:02 1313787    /home/Nathan/.fontconfig/6cfc7d49b27ba7d3eb71ab86e04def2c-le32d4.cache-3
:b7561000-b7562000 r--s 00000000 fd:02 1313786    /home/Nathan/.fontconfig/6fcb01a03a016cc71057b587cdea6709-le32d4.cache-3
:b7562000-b7563000 r--s 00000000 fd:02 1313785    /home/Nathan/.fontconfig/46d51d90fe9d963f6f4186edb936a931-le32d4.cache-3
:b7563000-b7564000 r--s 00000000 fd:02 1313784    /home/Nathan/.fontconfig/b887eea8f1b96e1d899b44ed6681fc27-le32d4.cache-3
:b7564000-b7565000 r--s 00000000 fd:02 1313783    /home/Nathan/.fontconfig/860639f272b8b4b3094f9e399e41bccd-le32d4.cache-3
:b7565000-b7566000 r--s 00000000 fd:02 1313782    /home/Nathan/.fontconfig/211368abcb0ff835c229ff05c9ec01dc-le32d4.cache-3
:b7566000-b7567000 r--s 00000000 fd:02 1313781    /home/Nathan/.fontconfig/c46020d7221988a13df853d2b46304fc-le32d4.cache-3
:b7567000-b7568000 r--s 00000000 fd:02 1313780    /home/Nathan/.fontconfig/df893b4576ad6107f9397134092c4059-le32d4.cache-3
:b7568000-b7569000 r--s 00000000 fd:02 1313779    /home/Nathan/.fontconfig/900402270e15d763a6e008bb2d4c7686-le32d4.cache-3
:b7569000-b756a000 r--s 00000000 fd:02 1313778    /home/Nathan/.fontconfig/47f48679023f44a4d1e44699a69464f6-le32d4.cache-3
:b756a000-b756b000 r--s 00000000 fd:02 1313775    /home/Nathan/.fontconfig/2881ed3fd21ca306ddad6f9b0dd3189f-le32d4.cache-3
:b756b000-b756c000 r--s 00000000 fd:02 1313771    /home/Nathan/.fontconfig/3c3fb04d32a5211b073874b125d29701-le32d4.cache-3
:b756c000-b756d000 r--s 00000000 fd:02 1313767    /home/Nathan/.fontconfig/e61abf8156cc476151baa07d67337cae-le32d4.cache-3
:b756d000-b7570000 r--s 00000000 fd:02 1313766    /home/Nathan/.fontconfig/b67b32625a2bb51b023d3814a918f351-le32d4.cache-3
:b7570000-b7571000 r--s 00000000 fd:02 1313758    /home/Nathan/.fontconfig/991510d2da7f7b2bf8468002aae90060-le32d4.cache-3
:b7571000-b7572000 r--s 00000000 fd:02 1313747    /home/Nathan/.fontconfig/d3379abda271c4acd2ad0c01f565d0b0-le32d4.cache-3
:b7572000-b7573000 r--s 00000000 fd:02 1313745    /home/Nathan/.fontconfig/b4d0b56f766d89640448751fcd18ec1e-le32d4.cache-3
:b7573000-b7773000 r--p 00000000 fd:00 1840396    /usr/lib/locale/locale-archive
:b7773000-b7781000 rw-p 00000000 00:00 0 
:b7781000-b7788000 r--s 00000000 fd:02 1313742    /home/Nathan/.fontconfig/12b26b760a24f8b4feb03ad48a333a72-le32d4.cache-3
:b7788000-b778e000 r--s 00000000 fd:02 1313737    /home/Nathan/.fontconfig/928306c3ad40271d946e41014a49fc28-le32d4.cache-3
:b778e000-b778f000 r--s 00000000 fd:02 1313735    /home/Nathan/.fontconfig/1248881498ac025e45c3042f6afe9284-le32d4.cache-3
:b778f000-b7792000 r--s 00000000 fd:02 1313725    /home/Nathan/.fontconfig/beeeeb3dfe132a8a0633a017c99ce0c0-le32d4.cache-3
:b7792000-b7793000 rw-p 00000000 00:00 0 
:bfe46000-bfe5b000 rw-p 00000000 00:00 0          [stack]

open_fds:
:0:/dev/null
:pos:   0
:flags: 0100000
:1:pipe:[87001131]
:pos:   0
:flags: 01
:2:pipe:[87001132]
:pos:   0
:flags: 01
:3:socket:[87001200]
:pos:   0
:flags: 04002
:4:pipe:[87001203]
:pos:   0
:flags: 00
:5:pipe:[87001203]
:pos:   0
:flags: 01

Does that provide any useful information? Is there a way past this, without having to re-boot? In Widows for example, one can normally press the CTRL+ALT+DEL buttons down, get the Task Manager, and kill off any processes that have hung, resolving the situation, but have tried that already, and the screen just flashes at me!!!

I'd be grateful for any helpful suggestions please!

Thank you.

[giulix63]

Considered you have physical access to the server, would you please explain why you are reluctant to reboot?

[CharmingNathan]

Yes, two reasons:

Firstly it has been up and running since the beginning of February, and secondly - and more importantly - it still has listeners attached and listening to the output.

[giulix63]

Well, you'll understand that greatly complicates the solution approach. You also realize that the server will eventually need to be rebooted, of course. As for those listeners, are they simply web server/FTP listeners? If so, I'd say maintaining them is not of paramount importance and they can be severed, but the last word is up to you, of course.
In order to asses what could have caused the malfunction, would you please post the contents of /var/log/yum.log?

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cat /var/log/yum.log

A complete list of all the running processes may be helpful, too

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ps -ef

Both commands to be run as root. Also, please note that there are limits to the quantity of lines one can attach to a single forum post, so you may want to use CentOS pastebin instead and post here the links.

[CharmingNathan]

I know it doesn't make life any easier - as they are listening to an audio stream courtesy of Edcast and going through Centova Cast - which is still presumably working on the server - I presume they are listening via HTTP rather than FTP.

As for running, cat /var/log/yum.log and ps -ef, perhaps there has been some mis-understanding? As I stated in my first post, whether I attempt to access via TightVNC or attaching a monitor for direct access, I have no method of communicating with the server - any touch of a key or movement of mouse just produces the blue desktop background, then it alternates between that and a black screen. Also, does the crash E-Mail content which I posted above not help?

Unless, of course, you meant for me to run those commands post re-boot, which would seem to imply you don't feel there is an alternative to re-booting?

[TrevorH]

If it doesn't respond to the console then I doubt if it's doing anything at all for anyone.

[CharmingNathan]

There is an external Homepage which I can still reach, which tells me that one stream has listeners, plus the indicator lights on my Modem/Router are flashing on and off, very rapidly, which is usually a sign that there are listeners to the stream. Centova Cast (which manages the output of the stream, effectively), is a very small piece of software, so I am not surprised it is still running, but by the looks of it, it's all that actually is!

Is there no CTRL+ALT+DEL equivalent on CentOS 6 that would allow me to kill the hung processes? Although instinct tells me that would probably re-boot the server anyway!

In direct response to your post though TrevorH, I haven't found a way of communicating with the server: TightVNC still responds in that when I try to access the server, it still asks for my login credentials, but then goes back to the flashing screens showing the blue desktop and a black screen intermittently.

[giulix63]

Yes, sorry: I thought the monitor/keyboard approach had worked. Now, re-reading your post I realize I misunderstood... my bad. And yes, Ctrl-Alt-Del will reboot the server, if anything. As a last resort, I would try to access the console by pressing Ctrl-Alt-F2/3/4 with the monitor/keyboard attached. If that still doesn't work, then you're definitely out of luck, IMO.

[CharmingNathan]

Yes, sorry: I thought the monitor/keyboard approach had worked. Now, re-reading your post I realize I misunderstood... my bad. And yes, Ctrl-Alt-Del will reboot the server, if anything. As a last resort, I would try to access the console by pressing Ctrl-Alt-F2/3/4 with the monitor/keyboard attached. If that still doesn't work, then you're definitely out of luck, IMO.

Thanks for your clarification giulix63! One question though regarding pressing CTRL+ALT+F2/3/4, I actually tried that on my own P.C. (which also happens to run CentOS 6) and just ended up losing the desktop and being at the console. If I do that with the server, and the same thing happens, i.e. the desktop crashes even more that it seems it already has and the output the listeners are connected to will therefore be presumably lost, is that not tantamount to re-booting anyway, in that the affect will be the same?

I suppose your suggestion is that once at the console, I could at least run those commands to see what the problem is, and attempt to resolve it, i.e. re-start Apache, vsftpd, etc.?

[giulix63]

One question though regarding pressing CTRL+ALT+F2/3/4, I actually tried that on my own P.C. (which also happens to run CentOS 6) and just ended up losing the desktop and being at the console. If I do that with the server, and the same thing happens, i.e. the desktop crashes even more that it seems it already has and the output the listeners are connected to will therefore be presumably lost, is that not tantamount to re-booting anyway, in that the affect will be the same?

If you press Ctrl-Alt-F1 on your own PC, you'll get your desktop session back. So no, ideally you should still be able to get your initial session back, whatever that was (not that it makes any difference here, since you can't use it).

I suppose your suggestion is that once at the console, I could at least run those commands to see what the problem is, and attempt to resolve it, i.e. re-start Apache, vsftpd, etc.?

That's the idea. Basically, what we are trying here is to regain control of the server without rebooting.

P.S. I just realized you didn't mention SSH. Is sshd running on the server? If so, you may also try to ssh into it: Open a teminal and

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ssh user@server_name_or_ip_address