Server :: SSH Frozen Display - Maybe Missing Responses

Apr 12, 2010

I'm having a problem with connecting over ssh to a server (wrdsvr) that has me perplexed. I'm using putty to connect from my WIndows VM desktop to a SLES 9 server. If I connect to wrdsvr from my desktop over ssh and run certain commands with multi-line output, the display freezes after the first line. If I connect from my desktop to a different server (oksvr), and then from oksvr I connect to wrdsvr, then there is no problem. In fact, by running 'w' after connecting in that roundabout way I can see that subsequent commands I type into the frozen window still run.

I just can't see anything in the window itself as the display is frozen. I have sshd logging running in debug mode on wrdsvr and there is nothing produced during this. There is also nothing in the putty event log. If I type 'exit' in the frozen window, the server sees the connection as closing normally and then gone. Usually my putty window would then close automatically, but in this frozen case it doesn't. So although it is sending characters I type in, it doesn't seem to be receiving the output in return.

commands that run successfully are:
w
ls
man
less

commands that cause the display to freeze are:
ps ax
ls -l
top (for this one I don't even get the first line of output, it freezes immediately)

The machine I'm connecting from is a VMFusion guest running Windows XP. I get this behavior connecting using putty, but I also installed a demo version of securecrt (when this issue occurred previously) which saw the same problem, but I can't repeat it as my license expired. (Last time the issue went away while I was troubleshooting an immediate service-affecting problem on that and a number of other servers and I don't know what fixed it!) I exported the putty registry keys and the profiles for the two servers are identical. I tried loading the profile for oksvr and temporarily changing the hostname to wrdsvr, but saw the same issue. I am connecting over a Cisco VPN.

My colleague is on the local network and does not see this issue when he connects to wrdsvr using putty. We are both using the same version of putty 0.60. Here is the background on the servers. Both wrdsvr and oksvr are running SLES 9. My actions just before I noticed these issues were the following. I updated them using you (yast online update) to the latest patch versions. Using the rpms from Novell, I installed binutils, make, gcc, and glibc-devel and finally VMware tools on both. I then rebooted. Since then I've run you again but that hasn't changed anything. I've compare the installed patches using diff and they are the same. Now I'm working my way through the output of rpm -qVa on each one, but nothing so far.

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Fedora Installation :: F10 Live CD - PC Got Frozen - No Responses From Anything

Jul 12, 2009

My hard disk is blank now due to some faults I made in installation.I made a USB stick from which can start Fedora 10 livecd image successfully. My USB device is only 2GB, so livecd image is my only choice. Everything is fine in live cd system. but when I try to install system to hard disk, my PC got frozen - no responses from anything. This situation only happens when I set up the partition and began to write image to the hard disk. It happens at about 5 percent of the progress bar every time. It seems I can't install F10 this way.

So I tried another way : using this LiveCD USB Stick, install it in text mode. However, strange thing came up too: when I finished install the system , it tips "reboot". so I pressed "reboot", however it start KDE and then got frozen again. When I restart PC by "reset" button, it tips me can't find OS - insert system disk and press Enter. It's a BIOS message , so I think at least GRUB is not working. But why and how this happens? I set up them correctly without error tips. But now it can't be started. I set GRUB to be installed in MBR during the installation. My hardware is like this : AMD 5000+ black edition , 4GB RAM , ati 3200 video card , 320GB hard disk (sata port).

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Nov 10, 2010

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Jan 14, 2011

I've got a page with an elaborate javascript in it (imageflow) that is meant to emulate the apple coverflow that you see on iPhones. It wasn't my idea to use it but I must fix it.

This elaborate javascript, in order to show reflections of an image, makes use of a PHP script that will take an image as input, invert it vertically and create a reflection image dynamically. The script is called reflect2.php.

The problem I'm having is that the reflect2.php script is unpredictably returning 403 (forbidden) or 404 (not found) errors sporadically. The behavior will vary for a given image so it's apparently got no relation to the image format. For example, I will load my page and I'll get some 403/404 for certain urls (which correspond to images in my page):

FIRST ATTEMPT - only one bad reflection image url

The second time I load the same page, that previously broken image will be fine but this other one will be broken
SECOND ATTEMPT url

The third time, all the prior images are fine and this image, which was fine before, is not 403:
THIRD ATTEMPT url

I don't know why a given request to reflect2.php might result in a 403 reponse. As far as I can tell there is no code in the script that would result in such a header being sent for any reason whatsoever. I'm wondering if this might be a problem with Apache somehow. I'm on thin ice when it comes to Apache configuration values but perhaps there's a limit in the simultaneous connections permitted, the number of PHP threads available, or the keep-alive values or something?

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Aug 31, 2010

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Jun 6, 2011

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I've done a little reading and learned that bind9 does not run 53 <-> 53 anymore (is now >1024 <-> 53), and modified my config so it works like bind4 did, but I am concerned that this makes me less secure. additionally, I'd really rather not have a completely open 53 rule, but it seems that if I constrain 53 traffic to my known forwarders, it interfers with some of my network services like transmission. so, what firewall rules would you guys recommend for recieving forwarded DNS query responses to my server?

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May 1, 2010

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Oct 22, 2010

Back in April I set up a Ubuntu DHCP server and a multiple VLAN network [URL] to migrate our various servers, workstations, etc off the 192.168.1.1 /24 network that everything was on because we where running out of address space. I built out the new network and everything worked great except our AD server would never get an IP address from the DHCP server (static reservation) and even if I set the IP statically on the AD server it couldn't ping the gateway and noone could log in. After several attempts to resolve this, including bringing in outside help, we where never able to figure out what the problem was.

Now 6 months later I have time to revisit the issue without effecting the live network. I used Acronis and imaged the AD server last Friday, cloned it on to another box with the same hardware, and put it up on the new network that's been sitting unused for the last 6 months. Today when I statically set the IP on the AD server (which is what I want) it connects and I can ping it's gateway 192.168.1.1 and all the way across vlans to a test sales agent workstation at 192.168.8.xxx on vlan 800 but only if I statically assign the agents station an IP address. When I try to get an IP address via DHCP it fails as destination unreachable. Nothing has changed in the last 6 months on the DHCP server but now it for some reason can't ping its default gateway 192.168.1.1. All of the config files are the same as they where left from the post linked above aside from the vlan id's used where changed from 1's to 100's (i.e. vlan 3 is now vlan 300) /etc/network/interfaces

Code:

auto lo
iface lo inet loopback
auto vlan100
iface vlan100 inet static

[code]....

why it can't reach the gateway, when I do a tcpdump I can see the DHCP requests come in on eth0 but the server never responds and I'm pretty sure its because it isn't "seeing" them since it thinks there isn't a network connection but I don't know how to trouble shoot to find out where the problem lies.

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May 26, 2010

I am trying to get xinerama to work with x11vnc on Xvfb and I am getting:

xdpyinfo -ext XINERAMA
Xlib: extension "XINERAMA" missing on display ":0.0".
XINERAMA extension not supported by server

I am using the latest version of x11vnc which says XINERAMA is on by default. I have tried xf4vnc as well and get the same issue.

Xvfb :1 -screen 0 1024x2048x24 &
mwm &
x11vnc -display :1 -bg -nopw -xkb -N

I get a screen that looks like xinerama and windows pass from display to display fine, however xdpyinfo says otherwise and we have software that looks to xdpyinfo to get information about how display guis. When x11vnc was compiled it said it found libXinerama. Not sure what is going on. Does vncviewer need to support xinerama as well? Is there any way to tell if vncviewer does without downloading a newer or different version?

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Aug 22, 2010

I have followed the official instructions here to setup VNC service initially and was able to get it working.

However, during the course of setting up my BIND service, I have done the following:
1) Turned on SELinux
2) Used system-config-security to add the ports TCP:53 and UDP:53

When I tried to save the settings from 2) above, my GNOME desktop delivered via VNC got frozen.

Now when I tried to restart vncserver with "service vncserver restart", I see the following. I am also unable to connect via [url] anymore.

Code:

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Jun 21, 2010

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Problem is, I don't have access to any apps that will allow me to reboot the machine with access to "Shutdown/Restart". If I hit the reset button, will it be OK? Or will it blow up like a Windows machine? Luckily I can reinstall if necessary, but the update thing might crash me again. All was fine before applying updates. Anybody having problems with the latest updates?

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Dec 26, 2010

When i ssh to server using -X, i always confuse about which display number i should export. It seems to me sometimes the display number has been used by something, so what i can do is only

export DISPLAY=localhost:0 && xclock
export DISPLAY=localhost:1 && xclock
export DISPLAY=localhost:2 && xclock

[code]....

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Oct 6, 2010

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Feb 5, 2010

I've verified that xorg-x11-libs is installed. This package provides libXrandr.so.2. However, when I run a program, in this case the python script for blueproximity (start_proximity.sh), I get the error in the title.

Code:
grep -ni randr /var/log/Xorg.0.log
237:(==) RandR enabled
247:(==) RandR enabled
257:(==) RandR enabled
274:(II) Initializing built-in extension RANDR

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Jun 28, 2010

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Nov 29, 2010

I installed openSuSE 11.2 sometime ago in a COMPAQ Presario CQ60-419WM laptop (the ones that Wal-mart sold for $300 about a year-and-a-half ago. I installed the 64-bit version because I saw that the processor could support that (perhaps that was not a good idea). I have some problems that seem related to not having the necessary drivers. My wireless has never worked and my display is far from what I would like it to be (the response is slow, if a drag a window, its motion is jerky, if I scroll down in a browser window, the motion is wavy). The look and feel is very different from what I get at work and I do not know how to fix it.

[code]...

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Oct 19, 2010

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However, when I am in a shell, I am getting a second or longer waits between key presses at times.My only guess as to why is that may be is that the streaming audio is on some very high priority so everything else gets put on the back burner. In any case, does anyone have any experience with this and a possible tweak that would give everything else a "fair go" so things didn't seem so unresponsive?

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Jul 14, 2010

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internettrafficreport.com shows index of 84 for North America. I've pinged a few sites -- see returns from 16ms to 91ms.I've also rebooted my Verizon DSL router.

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Nov 18, 2010

I'm writing a mass snmp toner check which polls any toners available to be snmp polled, however when using a loop statement I get the results on different lines; which sounds good, however the tool I use to check with (nagios) ignores the new lines.

Is there any way I can get the output on one line? Also, I need to raise a fault if any of the toners are below a specific level (with nagios you raise faults with the exit code) - any way I can do this without exiting the loop. Code below with bits and bobs commented out.

Code:
check_ink_levels ()
{
for ID in $INKS
do

[Code].....

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Aug 6, 2010

I am having (seemingly) random trouble with my wired network ever since I installed Lucid. I have no problem getting an ip address from dhcp. However, randomly the computer will boot and although I have an ip address I do not receive any responses for pings on the network nor can I browse the web. If I sudo /etc/init.d/networking restart a few times (or reboot) it will start working. However, restarting the networking services (as mentioned above) again will cause me to no longer receive responses for pings or browse the web.

Furthermore, I have never been able to successfully ping if I manually set an ip address. I have un-installed network manager and I am using /etc/network/interfaces to configure the network. Using Lucid Lynx 64bit on a Dell Precision. I have pasted below the output of a few working commands. When I switch between static ip and dhcp I am commenting/uncommenting the lines shown in /etc/network/interfaces.

sudo lshw -c network
*-network
description: Ethernet interface
product: NetXtreme BCM5754 Gigabit Ethernet PCI Express
vendor: Broadcom Corporation
physical id: 0
bus info: pci@0000:08:00.0
logical name: eth0
version: 02
serial: 00:23:ae:99:4a:85
size: 100MB/s
capacity: 1GB/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.102 duplex=full firmware=5754-v3.24 ip=10.200.147.153 latency=0 link=yes multicast=yes port=twisted pair speed=100MB/s
resources: irq:78 memory:f7cf0000-f7cfffff

cat /etc/network/interfaces
auto lo
iface lo inet loopback
address 127.0.0.1
auto eth0
#iface eth0 inet static
#address 10.200.147.56
#netmask 255.255.255.0
#broadcast 10.200.147.255
#gateway 10.200.147.1
iface eth0 inet dhcp

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Jul 7, 2010

I have a home network consisting of 1 Linux box running Fedora 13, a laptop running Windows XP, and an HP Officejet Pro L7780. With the Fedora 13 box I have Firefox 3.6.4. I have noticed in the last couple of days a very sluggish response seemingly one site, amazon.com. I'll connect to the site but Firefox remains loading the page and parts of it will be missing. If I search for a particular item it takes forever to display parts of the newly requested page. I have hit stop and then refresh and sometimes the page will then come up although it's never 100%. Eventually I'll loose my router (which by the way is a Linksys BEFSR8.1 v3.01), in that if I ping it I'll get the error that it is unreachable. The laptop also looses access to the router. I'll then reset it (unplug/plug) and it'll come back up ok until I go back to Amazon and start searching again.

My question(s) are:
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Nov 20, 2010

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Sep 30, 2010

I'm going through strange symptom with my linux.

When I type

Code: service xinetd [start|restart|stop]

There is no responses or messages at all. Even when I tried some meaningless argument, such as

Code:service xinetd sdfsdfsdg , it just doesn't work.

I checked that xinetd is installed by using the command

Code: rpm -qv xinetd

Also I do not see the error message "Unrecognized service" when I type the commands.

Here's what I see when I type the command.

Code:

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Feb 15, 2011

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ben@WOPR:~$ ping google.com
PING google.com (74.125.230.114) 56(84) bytes of data.
64 bytes from 74.125.230.114: icmp_req=1 ttl=54 time=26.2 ms
64 bytes from 74.125.230.114: icmp_req=2 ttl=54 time=25.9 ms
64 bytes from 74.125.230.114: icmp_req=3 ttl=54 time=29.3 ms
64 bytes from 74.125.230.114: icmp_req=4 ttl=54 time=25.5 ms
^C64 bytes from 74.125.230.114: icmp_req=5 ttl=54 time=25.8 ms

--- google.com ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 20199ms
rtt min/avg/max/mdev = 25.514/26.569/29.308/1.399 ms
ben@WOPR:~$ ping -n google.com
PING google.com (74.125.230.115) 56(84) bytes of data.
64 bytes from 74.125.230.115: icmp_req=1 ttl=54 time=25.6 ms
64 bytes from 74.125.230.115: icmp_req=2 ttl=54 time=26.0 ms
64 bytes from 74.125.230.115: icmp_req=3 ttl=54 time=26.8 ms
64 bytes from 74.125.230.115: icmp_req=4 ttl=53 time=21.5 ms
^C
--- google.com ping statistics ---
5 packets transmitted, 4 received, 20% packet loss, time 4006ms
rtt min/avg/max/mdev = 21.540/25.042/26.859/2.064 ms

I've tried disabling ip6, disabling avahi and adding options single-request to my /etc/resolv.conf - problem remains. If it helps when installing Squeeze was prompted to install firmware-realtek, which I didn't have. So downloaded onto usb from another machine installed once setup was complete.

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Jul 24, 2010

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$ http_response < my_http_request.txt
HTTP/1.0 200 OK
Date: Sat, 24 Jul 2010 18:43:58 GMT
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Nov 15, 2010

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Nov 27, 2010

I have VIA/S3G unichrome IGP video card of 32MB after installing fedora i am getting very worst resolution of 600x400which is completely irritating so please provide me a way out from this problem to use fedorathe solutions i followed and failed are given below

1. Some one told me to change the xorg.conf file but i failed because there is no such file in the given location

2. Some one told me to create it using system-config-display but for fedora 14 there is no package for that

3. some one told me again of using the command Xorg -configure but it said as followed [root@localhost tmp]# Xorg -configure

Fatal server error: Server is already active for display 0 If this server is no longer running, remove /tmp/.X0-lock and start again.

[code]....

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Nov 19, 2010

that's my first linux server. on my root is CentOS already installed. when i connect via "Remote Desktop Viewer" i log in with my accout.

then i see the textmode and type in "startx" and "init 5" but nothing happens but i can see this:

[root@server004 ~]# startx
xauth: creating new authority file /root/.serverauth.2896
Fatal server error: Server is already active for display 0

If this server is no longer running, remove /tmp/.X0-lock and start again.

Xlib: connection to ":0.0" refused by server
Xlib: Invalid MIT-MAGIC-COOKIE-1 key
giving up.

[code]....

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Dec 28, 2009

After upgrading to 11.2, I get the following error when starting any xclient. Worse, its usually repeated a few times for each client.

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