CentOS 5 :: Server Suddenly Unreachable From Other PCs On The LAN
Jan 28, 2010
I have a CentOS5 box here (actually running the latest release of EasyIDS). Everything was working fine for about half an hour, and now I can't access the box through a web browser on it's IP address. I can't ping the box either. If I log on to the server, I can ping other boxes on the network and external resources, but nothing seems to be able to see it. I checked to make sure HTTPD is running, and it is. The firewall is not running (or at least that's what it says when I do service --status-all).
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Jan 31, 2010
recently i setup new LAMP server , after some days faced a strange problem? suddenly the server load goes to 100 or 80 but there is no wearied process running? the normal lod is between 0.5 to 1.5? the server have 2 hdd on hardware raid 0
[Code]...
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Jan 13, 2010
I have an HP BL460c G5 with 5.3 installed fresh
it can ping its own IP address just fine
its a bit slow but constant pinging the switch its connected to
and i get alot of Destination host unreachables(a few do get through) when pinging the gateway
port on the switch is hardcoded to GB/full. and the server itself reads that its connecting at GB/full.
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Jul 30, 2010
I have 5 1955 blades in an enclosure for an custom application cluster.All were running Centos 4.4 no problem.We wanted to start upgrading them cleanly to 5.5 so two of them got fresh installs of 5.5.The installs went well enough, no glaring errors.However they can only ping each other! The network settings are fine, no firewall or selinux. I'd run the info script but I can neither download it to them nor paste it in via kvm.Standard static entries, virtually identical to their 4.4 brethren. They ping each other so network drivers are fine, no built in switch configuration changes. It has to be some kind of network configuration issue that i'm just not seeing.
Edit* When i try and ping anything else, including the other blades, I get Destination Host Unreachable.
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Jun 13, 2009
I setup mysql v5 on centos, follow all the instruction i was able to google for to enable remote access, I am able to log in to -h localhost and -h (external IP address) from same server, I am able to telnet to 3306 using localhost and external ip address, BUT when I try to connect from deferent server i get host unreachable error H3000 (113) and telnet also is not able to connect via port 3306 I covered all the bases but stii no luck. same setup works for slackware no problem and there is no issue with client.
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Jul 13, 2010
I am trying to set up a virtualized ubuntu server in a local lan.In short : The server does not always answer to ping/ssh/whatever, but sometimes does, it seems completely random and dependant on the clients, it drives me crazy, what can I do to track down the problem ?In long : I will give the exact environment further down, but first the symptoms :A very strange network behaviour : the server does not always answer to ping/ssh/whatever from another computer in the LAN. It *seem*s completely random if it does or not, however I have identified some facts :- it is able to ping any computer in the LAN, or even outside (using IP or hostname) so it's connection seems ok.
- it is able to ping itself using "ping localhost"- the hyperviser is always able to ping it, however the *first* ping always fails (ie 3/4 first round then it works fine).now for the strange/random facts :- from my linux client, I can usually ping the server for about 10 minutes after I restart networking (in the ubuntu server), then it does not answer to ping/ssh/whatever anymore (though it happened that it suddenly came back for a while)- from my colleague windows client, we can ping the ubuntu server (same as the hyperviser, 3/4 first round), even when the linux client can't anymore- from my virtualized windows client, it is equal to my linux client (does not work fine)- from another linux client, same (does not work fine)- from 2 another windows machines, it does NOT work either !Now for the environment :- Hyper-V is the hyperviser on a DELL computer (not my fault, didn't have the choice)- Ubuntu server 10.04 standard install, with the synthetic network drivers activated in the kernel and defined in Hyper-V.
- A static IP- All computers in a LAN with mostly windows servers (such as DNS, AD and exchange servers)- there is another virtualized server (windows) on the same hyper-v global virtual network, with its own IP, and this one pings perfectly fine from any client.- the hyper-V also answers to ping
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Jan 15, 2010
I have a ubuntu desktop 9.10 that is used as a file server and occasionally as a desktop. My problem is after about 15 min of idle the server can not be accessed by other computers. I attempted to disable power management but Im not sure if i did that correctly. Where should i look for problems?
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Jun 8, 2010
i have a problem with my internet connection in ubuntu 8.04 server edition. if i ping to: [URL]... i get: Destination Host Unreachable but when i ping to my gateway or other pc's in my network no problems occur.
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Feb 6, 2011
I have checked the yum.log file and the last time an update was performed was Jan 6, 2011. I am the only person who administers this server and I do it remotely via SSH. No one has GUI access to this. At a minimum, the kernel version is older than the latest release. This is the first time since I brought this server online in 2009 that a monthly yum update didn't produce at least a dozen package updates. I've tried disabling the Priorities plugin (as well as rearranging priorities) and I get the same result: no updates available. For the record, I did spend quite a bit of time Googling this problem and doing a forum search here. I found nothing applicable to my particular situation. Here's the output of yum update:
[root@copeland2 log]# yum update
Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
* addons: mirror.5ninesolutions.com
* base: mirrors.easynews.com
* extras: mirrors.usc.edu
* rpmforge: ftp-stud.fht-esslingen.de
* updates: centos.mirror.facebook.net
0 packages excluded due to repository priority protections
Setting up Update Process
No Packages marked for Update
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Jan 4, 2010
I am connecting servers using NFS4 the shared directories are on servers running Debian 4 while the one who read from them is Debian 5.0.3. The problem is one of these shared servers suddenly stop responding and you cannot list it from Debian 5 server, also df hang, and the web application that is using it does not respond to requests that use this shared directory since it is blocked. Then the load on the server start to increase until the server cannot respond (over 90). I have found many entries in the syslog that refer to this like:
ma25555 kernel: [1200285.732919] nfs: server 10.xxx.xxx.xxx not responding, still trying
Dec 31 08:16:33 ma25555 kernel: [1200289.815378] INFO: task java:9702 blocked for more than 120 seconds.
Dec 31 08:16:33 ma25555 kernel: [1200289.835249] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
code....
I have tried the connection between the 2 servers using ping for one day and all are OK (zero lost)
There are 3 other servers that are running Debian 4 and are working fine.
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Aug 24, 2010
I've had a server running for over a year and it's been very stable. Suddenly (no config or software changes) it's behaving oddly. If I perform a network related activity, it appears to effect other separate network functions. Example: I get onto the machine using realvnc server and suddenly port 80 goes down, or I can access port 443 inside the network but not externally, or I can get to 443 but not 80. The server has two network cards. Switching to the second card appears to have had no effect. I also tried rebooting, switching in a new network cable, bouncing the network card (which does re-establish services, but not consistently). I have several servers and this is the only one misbehaving. It's running Debian Etch (as are a few others).
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Jan 11, 2010
My organization has been using PASV FTP via VSFTPD for some time now. We have defined the port range between 30000 and 33333 and as I mentioned, it has worked up to 20100108 (last Friday). It appears that VSFTPD is not negotiating the defined PASV port range, which we can see with both netstat and tcpdump. Has anyone here run into this before? Are there any VSFTPD hackers out there who know what mechanism VSFTPD is using to re-allocate the ports? I would think that it would release the port, and flag it as unused, or something.
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Jan 27, 2016
My plex media server suddenly stopped working after years of no hassle use. This is the output of cat /proc/version = Linux version 3.2.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.65-1+deb7u2
My problem is similar to this forum thread viewtopic.php?f=5&t=121945 where I can get it to start by running Code: Select all/usr/sbin/start_pms & but it's not my normal server configuration. I added a couple files to it and it seems to work except it doesn't start when I reboot. I have to run that command again.This is the init script I've been running for years...
Code: Select all----
#!/bin/sh
### BEGIN INIT INFO
# Provides: plexmediaserver
# Required-Start: $remote_fs $syslog $networking
# Required-Stop:
[code]....
My Debian skills are lacking to know how to proceed with troubleshooting what could have happened. Everything else seems fine, I just can't seem to get this application to run at startup or get back my old configuration...
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Feb 22, 2011
I have a machine running with slackware64 13.1 and vnc servers is installed on it. It worked for months until yesterday, when I couldnt connect to the machine remotely.
I have 2 vnc "users" on this machine, root and "user". Each have their own desktop. Root has desktop :1 and user had desktop :2. Simple enough.
VNC servers is started via /etc/rc.d/rc.local with the command:
Code:
Code:
It worked flawlessly. I use the very same configuration on my home server, never had a glitch.
From the "distant" machine, I get this error when I try to connect:
Code:
Unable to connect to VNC server
What has changed so it no longer works? I assume its not a network problem since the machines are all located in my home network and there is no firewall or router in between them.
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Aug 19, 2010
This is on Ubuntu 10.04 Server Edition. The ethernet cord was disconnected one day. I plugged it back in to find I can ssh to and from that machine, but I cannot update or browse the web (elinks) on it. I tried "ifconfig eth0 up" which did nothing. Why is it that only local connections work?
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Oct 4, 2010
So Im newish to computing, and new to anything network/linux related.Situation: yesterday I installed Privoxy and it was working great (verified via Privoxy.org). Starting today while at a coffee shop i go the error "the proxy server is refusing connections". All of my settings are what they were yesterday and the default:
Code:
$ privoxy --version
Privoxy version 3.0.15 (http://www.privoxy.org/)
[code]...
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Jun 1, 2009
I have a problem with compiling of mod_ruby-1.3.0 After a succesfull configure i get a error in the make, it say "make: *** [apachelib.o] error 1" . Here below you can find the results of de configuring and the make.I was following the roles in Howtoforge " The perfect server - Centos 5.3" everything goes perfect till mod_ruby-1.3.0
./configure.rb --with-apr-includes=/usr/include/apr-1
checking for a BSD compatible install... /usr/bin/install -c
checking whether we are using gcc... yes
[code]....
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Jul 26, 2010
is it possible to join Windows Server 2003 to CentOS 5 Cluster?
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Feb 22, 2011
when I reboot the server with centos 5.5 the SMB deamon doesn't start?
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Jan 4, 2011
I have a strange problem with my debian lenny server. I am running ispconfig 3, squirrelmail, webmin, clamav, etc on my lenny server. I have a few domain names binded to my ip adress. Until yesterday, everything worked fine. Today, i couldn't seem to reach my mailbox, and my website appeared to be offline. But when someone checks it from outside, it works fine! Only i cant reach it. This problem only occurs with one of the six domainnames i have. The rest is reachable for me.
I checked the logs, the ipadresses, everything seems fine. I have no clue what it could be... anyone suggestions?
Figured out the problem, party... it's a problem with my XP. If i boot in Windows 7 the site is reachable. Doesn't make sense tho.
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Jul 31, 2009
I have a big pb after installing F11 : my partition containing all my photos is now unmountable. Before installing F11, it was in ext3 filesystem
During installing F11 on sda1 (first hard drive), I noticed some strange error messages like "volume doesn't exist" or something like that.
now, when I try to mount my partition of my third hard drive, i get this :
Code:
[root@vincent vincent]# mount /dev/sdc1 /home/vincent/sdc1
mount: type inconnu de systme de fichiers 'lvm2pv'
which means "mount: filesystem type unknown 'lvm2pv' "
[Code]......
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Mar 25, 2010
I have one server with 4 network interfaces:
eth0: 192.168.0.0/24 - local lan A
eth1: 200.1.2.3 - internet link - default route
eth2: 192.168.10.0/24 - local lan B eth3: 192.168.20.0/24 - local lan C
Lan A - Default routing to eth0
Lan B - Default routing to eth2
Lan c - Default routing to another server but the workstations has static routing to this server too.
Everything is working fine on Opensuse 11.1 until I upgrade this sever to Opensuse 11.2 ( Reinstall, not update at all ). After upgrade to 11.2 the routing across local lan interfaces simply not work, if you try to ping lan-to-lan you got the message: Network unreachable, even with the IP Forward enable, but the default route is working fine trough the SNAT.
I've come back to Opensuse 11.1 and everything become normal, does anyone have an problem like this? Maybe a bug? PS: I do not try to disable the AppArmor, next weekend I will try Opensuse 11.2 without the AppArmor and post here anyway.
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Jan 11, 2010
I've got router with: eth2 - local network (192.168.1.1), ppp0 - uplink (x.y.z.a)
my firewall:
Code:
# Generated by iptables-save v1.4.5 on Mon Jan 11 12:22:25 2010
*raw
:PREROUTING ACCEPT [1038480:666298388]
[code]....
somehow iptables -t nat -A PREROUTING -i eth2 -d x.y.z.a -j DNAT --to-destination 192.168.1.1 helps, but imho there should be some other solution. kernel is 2.6.31.6, architecture is x86_64.
P.S. i've also tried iptables -A POSTROUTING ! -d x.y.z.a -s 192.168.1.0/24 -j MASQUERADE that didn't help either.
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Mar 7, 2011
I have two linux servers, I tried to ping from one linux box to another and vice versa but error message is "connect: Network is unreachable" Where as If I tried from windows machine I am getting the reply from both the servers.
C:Documents and Settings>ping bnkprod
Pinging bnkprod.softtech.com [172.20.40.141] with 32 bytes of data:
Reply from 172.20.40.141: bytes=32 time=16ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Reply from 172.20.40.141: bytes=32 time<1ms TTL=64
Ping statistics for 172.20.40.141:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 16ms, Average = 4ms
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Mar 21, 2011
i'm trying to run a server for a game, that requires a few ports open (*since i connect to the internet with a router); for example one of the ports that needs to be open is "8888". But i tryed opening it thru my router localhost and it doesn't work (d-link DIR-400), so i was thinking if there's any way to open the ports of the router directly from Ubuntu; maybe console or program?for example for windows there's (Smart Port-fowarding) wich opens the ports you want without goint thru the router page.
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Aug 17, 2010
Flashed bios lastnight on 13.0 desktop.
all winblow$ are fine.
lspci shows ehthernet card
did 'netconfig' and
'route -n' shows default settings as if /etc/rc.d/rc.inetd1.conf were never set.
oh yes, i manually edited this too. mv'd and netconfig'd.
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Dec 27, 2010
I've been having a lot of trouble with getting wireless networking devices to work. I guess I have a lot of company, since mfrs don't seem to be very interested in supporting Linux.It seems that one common symptom is that, when I try to "Ping" using the Terminal, I get "network is unreachable".Does this mean anything specific, or is it a general output whenever the network is not carrying on two way communications? Does it mean that the wireless interface is down? Does it mean that the wireless hardware is not transmitting? Not receiving?
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Jan 3, 2011
My ubuntu installation was running fine with the Belkin F7D1101 v1 after using this install method:[URL]..But, after allowing ubuntu to autoupdate many programs (don't remember which ones), the device stopped working. I checked all of the commands in the link above. They are all still functioning. dmesg throws no errors, but it terminates with
<code>ADDRCONF (NETDEV_UP): wlan0: link is not ready</code> Are there any network files which may have been overridden from autoupdate? iwconfig wlan0 shows "Access Point: Not-Associated" What output can I show you to help me find the problem?
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Jul 28, 2011
I dont even know where to start looking on Google.Just in case this matters, for completeness.I've an inactive eth0 (wired ethernet link) with static IP.Other possibly relevant details:I'm using an old 802.11b card. Cant imagine this is relevant, because the internet is working fine as far as pinging anything outside the local network goes.
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Aug 9, 2011
I have Ubuntu machine with cifs share mounted at boot via /etc/fstab
fstab entry looks like this:
/kain/buksica /media/buksica smbfs owner,_netdev,gid=xxxx,uid=xxxxx 0 0
When my coleague shuts down his windblows machine my Ubuntu box freezes.. I cannot even open my home folder.
Is there any way kernel can detect that this share is down and silently umount it or in some other way keep stable.
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