CentOS 5 Networking :: Server Does Sometimes Not Respond To External Contact?
Mar 1, 2011
I have a CentOS 5 Server running for private fun... Just for playing with it and learn a little linux.this server has to Network interface cards. one for connecting from extern and one from connecting from the LAN.when i want to connect from lan (eg via SSH) this allways works!when i want to connect not from LAN this only works sometimes! only if i establish at the same time a connection from LAN it wors mostly.with other devices i have no problem (tested another server with just 1 NIC) and this works too.also the problem is not dyndns because i have the same problem when i try to connect through the direct IP.
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Jan 9, 2011
I got a CentOS server setup as a dhcp server using dnsmasq. I followed this guide more or less: [URL] So, the problem seems to be concerning the DNS server on the clients. In windows I get the "limited connectivity" icon for the network, and when I select troubleshoot it says the DNS server does not respond. Issuing 'ipconfig /all' clearly shows the IP of the CentOS machine as the DNS server, which should be correct, yes?
ETH0 is working as WAN connection and that works great.. no problem with the WAN connection at all on the CentOS machine. ETH1 has the IP 192.168.0.1 and mask 255.255.255.0 When starting eth1, it sometimes says that it can't start eth1 because the IP 192.168.0.1 is already in use.. but that is most certainly not the case. Maybe there's some kind of issue here that messes with the DNS? What's mind boggling is that it works great on a linux machine (dhcp client) and on a windows xp machine. but it does not work on the windows 7 laptop and a vista laptop and a pda device.
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Apr 29, 2010
I have Centos 5.4 installed on my server. Everything works perfect, however sometimes apache does not work properly. When I write my domain to browser it tries to reach the site, however it can't get any result. (There is no "browser couldn't find" error). The browser just tries to get the content.
When I login to my server with ssh using my domain name, there is no problem. (Named works.) When I give the "service httpd restart" command the problem disappears.I looked at httpd log files but there wasn't any problem at that time.I use the API's of the Facebook and Twitter, so there are many Curl requests are made with PHP. Could that be the reason?
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Nov 16, 2010
I have CentOS 5.5 x86_64 with Apache, php and mysql.
I have just installed OTRS (helpdesk - trouble ticket system) on that server and no users.
This system works with perl, apache and mysql.
I notice that is slow to respond and at times unresponsive the apache welcome page. code...
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Oct 7, 2009
I have a problem on my LAN, then: I have a laptop on which Windows Vista is installed, and every time I try to do ping to my server centos, my centos server does not respond to ping. The server is operating normally, because I found other PCs on my network that communicate normally with my centos server.
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Aug 11, 2009
I cannot get either sendmail or postfix to send a 220 response, nor respond with details. See below for sample telnet output. Details: I have a server that requires email, but only for light use. I'm definitely not an expert, but I have set up a sendmail configuration on a previous server. I tried to configure sendmail first and then postfix later, when I couldn't get sendmail working. I'm not sure exactly what the problem is, but I have a feeling the following might yield some important information. Note: this is the result for Postfix, but virtually the same thing happened with sendmail, too. That is, initially the telnet connection would close immediately. Afterwords, I could connect a second time but then it never responded with a 220 banner nor any 250's.
[Code]...
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Mar 30, 2011
i have a website named [URL]... now i want to access this website using proxy server(squid,or etc...) under my personal server named [URL]...means that [URL]...
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Oct 14, 2009
i have just registered to this forum so forgive me if i ask wrong question at wrong place.i have a server with OS: fedora 7 Hardware: SuperMicro X7DVL-L
[root@ ~]# /sbin/lspci
00:00.0 Host bridge: Intel Corporation 5000V Chipset Memory Controller Hub (rev b1)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x8 Port 2-3 (rev
[code]...
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Jul 30, 2011
I am setting up a CentOS box as a NAT firewall that needs to also send mail. It needs to send this mail using an outside provider's SMTP. The provider requires SMTP over SSL. None of the machines inside the NAT will ever send mail except via the provider's SMTP nor will they ever receive mail except to local clients via the provider's IMAP servers.
So for the example the machine is TESTMACHINE. There is one internet facing ethernet port connected to a DSL modem via pppoe.
The SMTP it needs to send mail via is mail.host.net which requires SMTP over SSL (port 465) and username/password authentication.
The sendmail documentation is quite confusing on how to get this simple setup operating, so an example showing the appropriate changes to sendmail.mc and other require config files.
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Jan 21, 2010
I am trying to get a server to boot off the lan (pxe). I added a tftp server and tested it as operating successfully. I just plugged the pxe-server in and see the dhcp request/response as expected. The pxe-server then sends out an arp to the same address as the dhcp exchange, but the server never responds.
1. as the pxe-server already has info on the mac/ip-addr, why is it now sending another arp
2. why doesn't the server respond? I have most of my network setup the same way and the dhcp exchange is fine.
3. I'm guessing that the arp is triggered by the bootp exchange (next-server).
I do not have the server in the host table under that address.
127.0.0.1 localhost
127.0.1.1 ubuntu-desktop
192.168.5.101 windows1
Do I need to add 192.168.5.120 with a name to get arp to respond?
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Apr 16, 2010
I recently set up a new web/file server with 9.10 server x64 with 2 NICs and I am trying to configure eth0 to respond to my LAN for internal samba filesharing and eth1 to handle website/ftp requests on my static IP, but whenever eth0 is up the server is not accessible at 173.XX.165.65 for web or ftp but both work fine at 10.1.10.100. When eth0 is down, public IP works fine. I have set /etc/network/interfaces like this:
Code:
# The primary network interface
auto eth0
iface eth0 inet static
address 10.1.10.100
[Code].....
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Apr 28, 2010
Here are the specs of my machine: Linux matrix 2.6.18-92.el5 #1 SMP Tue Apr 29 13:16:12 EDT 2008 i686 i686 i386 GNU/Linux Red Hat Enterprise Linux Server release 5.2 (Tikanga)
When I run an ldapsearch in root, it works fine. tcpdump filtered by dest IP shows packets captured.
When I run an ldapsearch in a perl script as root, it works fine. tcpdump filtered by dest IP shows packets captured.
However, when I run it via a perl script in my cgi-bin directory it fails. tcpdump shows no packets captured. When I added a "2>&1" to my ldap search in my cgi script, I got "ldap_bind: Can't contact LDAP server (-1)".
I ran a "whoami" in my cgi script and it showed up as apache.
Another twist to all this is that I ran the same test on my slackware box, and everything works (esp the cgi script). Here's what the specs are on that machine:
Linux slackvm 2.6.29.6-smp #2 SMP Mon Aug 17 00:52:54 CDT 2009 i686 Intel(R) Core(TM)2 Duo CPU P8400 @ 2.26GHz GenuineIntel GNU/Linux
I checked the permissions on the ldapsearch file and directory, and they're the same (755).
Could there be something blocking the apache user on my Red Hat box from sending packets out?
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Mar 4, 2010
I have installed openldap on debian lenny as said here [URL]clients" for both ldap server and ldap client on 192.168.1.192. Now I can make normal ldap successfully but I would like to do secure ldap and replication ldap too. "ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1)" here is the error I got stuck with when I follow this link for replication and ssl/tls part[URL]Then I google to find solution and then try these commands
debian:/etc/ldap# ldapsearch -H ldap://192.168.1.192 -b dc=webon -x -d-1
ldap_url_parse_ext(ldap://192.168.1.192)
ldap_create
[code]....
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Dec 6, 2010
I have a secondary IP (external/Internet, not LAN) for a CentOS box, what do I need to do to make the server bind to that IP as well as it's primary one?
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Jan 14, 2011
In Red hat i used the nail command to send mail using an external smtp server without sendmail or other mail services active. My question is: In Centos 5 nail is not present but is present mailx in version 8.1.1-44.2.2
Is there a way to set mailx to use external smtp server ? because in many forum i get the string mailx -S smtp= etc.etc. but in my case the -S parameter generate mailx: invalid option -- S antoher question is there a an official repository to download rpm nail for centos ?
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Sep 28, 2010
Just installed openldap server on a VM CentOS called 'ldapsrv', it works fine, ldapsearch returns all ldap information.
Installed openldap client on another VM CentOS called 'ldapclient1', configured it with most basic configuration, no ssl/tls etc. but ldapsearch returns error:
ldapsrv is pingable:
Some outputs:
PHP Code:
PHP Code:
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Nov 10, 2010
I am behind a funny firewall, so that may have something to do with this, but since the problem materialized upon update to F14, I am assuming that this has something to do with it as well. (Both connections are on the internal network, so should not invoke the firewall/proxy, so the firewall issue is probably a red herring.)Since the update, neither evolution-mapi nor evolution-exchange (over OWA) are able to access my email. Here is the error given when using evolution-mapi:
Code:
Unable to authenticate to Exchange MAPI server: file exchange-mapi-connection.c: line 359 (exchange_mapi_connection_new): assertion `profile != NULL' failed Please enter the MAPI
[code]....
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Nov 4, 2009
My ISP blocks outgoing email if it does not login properly with a valid account. I successfully configured sendmail to use SMART_HOST and confAUTH_OPTIONS with confAUTH_MECHANISM set to LOGIN PLAIN.
It successfully sends email because I tested it with evolution sending through 127.0.0.1, but I need to specify myacount@mydomain.com as the email address for root.
But it doesn't work for logwatch because it sends as from root@localhost.localdomain, and my ISP's smtp server rejects it. The message I get back in root@localhost account is the following:
----- Transcript of session follows -----
... while talking to smtp.mydomain.com.:
>>> MAIL From:<root@localhost.localdomain> SIZE=581 AUTH=<>
<<< 550 5.7.1 Client does not have permissions to send as this sender
554 5.0.0 Service unavailable
I thought that I should masquerade all emails from this domain, so I configured sendmail as specified in [1] section "24.3.1.4. Masquerading", but it doesn't work. It seems that masquerading in sendmail is broken or something is wrong in the documentation.
[1] [URL]
I have sendmail 8.13.8-2 and centos-release-5-4.el5.centos.1.
Is there a way to specify the "From:myacount@mydomain.com" in logwatch ? or Is there a way to make it work the masquerading in sendmail so I can masquerade everything as coming from a specific account?
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Mar 16, 2011
I would like to connect via SSH or similar to my servers located in a remote DC from a laptop running centos5. I normally do this on a puter running dows, and using secureCRT. Just wondering if centos has something built in for this, or if there is some preferably free software I can get.
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Mar 15, 2010
This seems to have just started. I read a .pdf document with evince and I get a whole bunch of messages like the following.GConf Error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See URL... for information. (Details - 1: Server ping error:IDL:omg org/ CORBA/COMM_FAILURE:1.0)What does this mean? why is evince trying to contact a server when I just want to read a document?
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Mar 31, 2011
I'm getting a strange error on Ubuntu 10.04 when starting firefox, see output:
Code:
Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See [URL] for information. (Details - 1: Failed to get connection to session: /bin/dbus-launch terminated abnormally with the following error: EOF in dbus-launch reading address from bus daemon
[code]...
My version of Firefox I'm running is:
Code:
Mozilla Firefox 3.6.9, Copyright (c) 1998 - 2010
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Mar 27, 2010
Ldap and samba work fine if de ldap server is @localhost.
smbldap-populate however refuses to connect to the ldap server at the address ldaps://ldap.server
ldapsearch -x -H ldaps://ldap.server
I checked ldad.conf and smbldap.conf time and again.
Why oh why?
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Feb 12, 2010
I'm using FC12 with kde and cannot update the system time using the gui. The error is :Error unable to contact time server. How do i get it to work for the rest of the family who do not want to mess aboutcli mode?This does work from the terminal:ntpdate -u ntp.exnet.com so client software is present and correct leaving me at a loss.
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Jul 4, 2011
I have two servers, both running Ubuntu 11.04 Server. One is a web server, running only a LAMP stack and openssh-server. The other is running server daemons for TeamSpeak and Minecraft. Today, the game server just went down. I can access the LAN by using SSH to connect to the web server, and ping it from there. However, it won't respond to SSH or anything else. The server is a few kilometers from here, so I will be going there tomorrow.
This happened once before, probably about a month ago or something. That time, the web server was running just fine, but the game server was powered off. I thought there had been a power disruption, because when I checked the BIOS settings of the game server, it wasn't set to resume after AC power loss. The web server was set to do this, so it made sense that it would be up and running again after a brief power loss. There were also some news reports about power disruptions in my area.
The thing is, I changed the BIOS settings of the game server to make sure this wouldn't happen again. When I go there tomorrow, I will bring the server back up. However, I would like to know what caused this so that I may prevent it from occurring again. Is there a logfile or something that I can check tomorrow to find the problem?
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Jul 26, 2011
I developed a java application to organize the articles and notes for what I need for my work reports. The path appear in a jlist component and by clicking on I'd like the file opened. The application works fine in /home side.
In /root side I get this message error:
"GConf Error: Failed to contact configuration server; the most common cause is a missing or misconfigured D-Bus session bus daemon." I work in KDE (OpenSuse 11.4). Why I need a configuration tipically of GNOME?
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Mar 13, 2010
whenever i do anything as sudo i get GConf Error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See [URL].. for information. (Details - 1: Could not send message to GConf daemon: Connection is closed)
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Feb 16, 2010
I have a DELL running CentOS 5.4 with 2 active NICs, one with an external IP address (eth0) on 123.456.78.9 and another that is connected to our internal network (eth1), 192.168.2.x. When I reboot the server, everything works glowingly. External traffic is correctly routed over the external interface (eth0) and internal traffic over the internal interface (eth1). After some random amount of time, a couple of hours and sometimes a couple of days, all traffic starts getting routed over our internal network, so DNS requests fail, internet pages don't load, smtp connections fail, etc.
I'm assuming that everything that's not headed for our .1, .2 or VPN internal networks would go out the external interface. And why this works for a period of time and then stops working is beyond me. And when external traffic starts going over the internal interface, I just reboot and it starts working like it's supposed to again.
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Jan 25, 2010
I've reported this as a bug (#507546), but it occurs to me that maybe others aren't having the same problems, so maybe it's an issue with the configuration of my machine. I upgraded to Kubuntu 9.10 (Karmic) from Jaunty. Ever since the upgrade, I'm getting a number of weird networking problems (though basic webbrowsing & email work fine):
1. I can't mount an NFS partition, one that has worked on this laptop with every previous version of Kubuntu, and one that still works on other computers. If I do
$ sudo mount /usr/lab
I get
mount.nfs: rpc.statd is not running but is required for remote locking.
mount.nfs: Either use '-o nolock' to keep locks local, or start statd.
So then I do this:
$ sudo start statd
and get this:
statd start/running, process 18709
Then this happens again:
$ sudo mount /usr/lab
mount.nfs: rpc.statd is not running but is required for remote locking.
mount.nfs: Either use '-o nolock' to keep locks local, or start statd.:
but
$ sudo start statd
start: Job is already running: statd
so then I do this:
$ rpcinfo -p
and it hangs for something pretty close to 3 minutes and then says this:
rpcinfo: can't contact portmapper: RPC: Remote system error - Connection timed out
See also this:
$ ps ax | grep port
18017 ? Ss 0:00 portmap
18878 pts/27 R+ 0:00 grep port
Note that the 3-minute hang with rpcinfo -p also happens if I do not attempt to manually start statd first.
2. Whenever I try to print something from okular, the window freezes for about 3 minutes and then the print dialog comes up. The printers I want (network printers) are not shown in the list.
3. My department uses Retrospect (commercial closed-source software, sorry) for backups, and I haven't been backed up since I upgraded. The problem, again, is that when I try to start the backup client it hangs for about 3 minutes but then fails to come up.
4. And some new information not in my bug report: I've noticed that certain (but not all) OOo Impress presentations cause Impress to freeze for about, you guessed it, 3 minutes before the window opens. I just copied one of the troublesome presentations over to another Kubuntu Karmic machine, and it opens fine there. I believe that machine can also mount NFS partitions without trouble. it smells like some pervasive networking/communications problem specific to the configuration of my own laptop. But, I don't really know where to start. This has never been a problem before, and I don't think my networking setup is extensively tweaked
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Apr 3, 2010
Anyone what this gksu error is about (it repeats it three times)
gksu-2.0.0-1.el5.rf.x86_64.rpm
# gksu ls
GConf Error: Failed to contact configuration server; some possible causes are that you need to enable TCP/IP networking for ORBit, or you have stale NFS locks due to a system crash. See [URL] for information. (Details - 1: Failed to get connection to session: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.)
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Jan 15, 2011
opensuse v11.3 I enabled a NFS server on a host, set up a couple of exports, opened the ports in the firewall. When I open the NFS Client on another host and select "Choose", there is popup that states "Scanning for hosts on this LAN...". Then it returns an error "No NFS server found on your network. ..." That's funny because I had previously mounted the two exported directories already by entering the server name manually. How do I get the NFS server to respond to an automated search?
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