CentOS 5 Networking :: OpenVPN Doesn't Work On CentOS 5.3 With Windows Client?

Jun 27, 2009

This will be a little long (having read Phil's 'how to ask questions' FAQ). I'm trying to get OpenVPN working between my CentOS server and some Windoze laptops running XP. There seems to be plenty of sample
config files available, but to date, none of them have worked for me. Pulling out my trusty Wireshark, I've found some clues,

My local subnet (NAT'ed by my gateway router) is 192.168.52.x. My router has been configured with a conduit (port-forward) for port 1194 (the standard OpenVPN port), which points towards my CentOS server.The CentOS server is .52.112, and the supplicant is .52.110. I have tried the lient both inside and outside my local subnet, with no difference in events or outcomes.


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CentOS 5 Server :: Openvpn Connect To Samba Share From Windows XP Client?

Sep 15, 2009

I'm trying to set up a VPN connection between our CentOS 5.3 server at work and my bosses XP computer at home. At this point, we are kinda locked into Quickbooks. I'm testing the connection from my XP boot at home to see if it works. I can log into our servicemanuals easily enough from XP at home however, the windows takes forever to update. I have the Samba server only listening on port 445 because is seems to work more efficiently at work. I connect to the Samba shares via linux from home and everything works well but, when I try to do anything with the shares from Windows client at home, it's very slow!

I'm thinking that it must have something either to do with the Windows OpenVPN client or the client.conf file. Is there anything I should look at in the .conf file for answers?

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CentOS 5 :: Dual Booting With Windows 7 - Just Doesn't Work

Oct 2, 2010

I'm a visual effects artist and although many VFX post production houses use linux, I've always used windows because of the programs. At this point, I've migrated to different programs which are also available on linux. The only set of programs I won't have, would be the Adobe Suite. So, I decided to finally start using linux again. I used it back when I was a kid for a few years, but just to have it really. We mainly use macs at work, but I'm switching to linux now.

Since I mainly use Autodesk Maya, the first choice would've been RHEL. Which is why I'm here now, you can guess.

I've downloaded the .iso of CentOS 5.5 and checked it against the hashes and it came out fine. I burned it to a DVD and booted my main computer (I have 3 I plan on installing it onto) and tested the media, came back fine.

I have two HDs, one 1.5TB SATA and one 150GB SATA. The 1.5TB is the C: drive of windows, and I've shrunk it to allow 80GB for linux.

So that is sda. sda1 is the windows partition and I make sda2 ext3 out of the empty space by choosing the custom partition scheme. It installs fine.

However, booting up the computer boots straight to windows. No GRUB.

I've reinstalled many times now, changing the GRUB from sda to sda1 to sda2. Nothing.


I've adapted that guide to CentOS and tried that, but whenever I select the CentOS option during bootup, the computer instantly restarts itself.

I've tried reinstalling the GRUB via a Live CD like many googled sites say to, but I always get errors.

If I find the /boot/grub/stage1, it says it can't be found.

If I try to setup GRUB, it says /boot/grub/stage1 is unreadable

So, I download the Ubuntu CD and install that. I use the guide previously posted to do the same thing, by installing GRUB onto sda2 where Ubuntu is.

So I pick that option on startup and it brings me to Ubuntu's GRUB menu. It all works fine. CentOS doesn't though.

Ubuntu is using GRUB2, so it has a grub.cfg file. Inside the file near the end, it lists Ubuntu as (hd0,2) and windows as (hd0,1).

That shouldn't be right? What's (hd0,0) then?

The CentOS grub.conf file lists CentOS as (hd0,1) and windows as (hd0,0). That should be correct. But I change it anyway to (hd0,2) and (hd0,1) and it still doesn't work.

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CentOS 5 :: Installed Windows &, But Now Internet Doesn't Work?

Jan 4, 2011

I've just installed Windows &, but now my internet doesn't work. How is that possible?

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Networking :: Naming A Centos Server For A Windows Client?

Mar 12, 2011

i have a centos 5.5 server running tomcat,oracle xe,apache etc..i would like to be able my windows machine to access this server by name, and not ip, for example have http://backserv:7080 for oracle xe web admin and so on..i know one way is DNS, but if i install oracle on a windows machine in peer-to-peer network, i can allready access with by it's name. o i'm guessing i should do something with samba, wins or something like that.never mind i got now for the REAL complex stuff of insalling web sphere 7 without user interface (need to look for a response file).

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CentOS 5 Networking :: UCD-SNMP-MIB Doesn't Seem To Work

Aug 20, 2009

I am trying to monitor a Centos 5.3 box using SNMP and I am having a lot of trouble getting the data that i need from it. Everytime I try to get information from the UCD-SNMP MIB it returns "End of MIB". It is my understanding that UCD-SNMP is a standard package when Net-SNMP is installed and should always be there. Then why can't I access it? I have tried removing the reinstalling Net-SNMP, but that hasn't worked. My server is update date on all it's patches as well. It is quite old hardware, but I don't believe that should affect SNMP from being gathered. Iptables is down, and I cant' even get it from the local machine.

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Networking :: Iptables Doesn't Work Well Without OpenVPN?

May 31, 2011

my problem is following: I'm running a bridged OpenVPN on my Debian. If the service is running, everything works fine: local and Internet, ftp, mailing from in and outside etc. But, when stopping OpenVPN, sending mails from inside (LAN) fails: I cannot reach smtp (postfix) listening on port 465. And even reaching mailboxes using IMAP gets horribly slow eg. in Thunderbird. Here is my firewall.sh script.


echo "
IPTABLES FIREWALL inicializalasa - szures"
# Enter the designation for the Internal Interface's


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CentOS 5 Networking :: Config Proxy Client Side For CentOS 5

Oct 4, 2010

I've tried to read many of the topics in this forum first and tried to find a solution to my problem, but can't find one.I'm testing CentOS 5.5, it's the first time I'm using a CentOS Linux release.I'm trying to configure the proxy "client side " on it and cannot find how to do it.On other Linux release I've used the ENV variable like "http_proxy" or "HTTP_PROXY" etc etc.This time, I don't know why but it doesn't work.I've put the name and @ip of the proxy in /etc/hosts and tried different version upper/lowercase of "http_proxy" "HTTP_proxy" "ftp_pr.." but it doesn't work.If I configure manually Firefox and puting the name or @ip of the proxy we have on our network, it works.But if I try to use ENV variable it doesn't work...

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Ubuntu Networking :: Config OpenVPN Client For SwitchVPN In Network Manager From Windows Ovpn Files?

Jul 17, 2011

I have ovpn configuration files for Windows from SwitchVPN. They do not provide configuration files for GNU/Linux. They said I can extract the certificate and key files from the ovpn files, but I'm confused about how to do that.First of all, I don't know which Authentication Type to choose: "Certificates (TLS)," "Password," "Password with Certificates (TLS)" or "Static Key."

Second, I don't know what to put where from the ovpn file. I see a <ca> � </ca> section and a <tls-auth> </tls-auth> section, but I don't see how those correspond to any of the Authentication Types. "Certificates (TLS)" and "Password with Certificates (TLS)" require two certificates and a key, "Password," requires one certificate and no key, and "Static Key" requires a key and key direction but no certificate. When I connect to SwitchVPN in Windows, it asks for a user name and password.Here's an example of the ovpn files (certificate and key contents removed):


route-delay 3
dev tun


how to get what I need from the ovpn files, and which Authorization Type to choose in the Network Manager VPN configuration GUI, and what to put in the blanks?

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CentOS 5 Networking :: Bonding Mode=1 Doesn't Work Properly

Dec 10, 2010

We have a Blade server connected to a two internal ESM Cisco switch. We want to have a active-backup configuration with bonding. We follow the documentation and we hace configured the next:

Centos 5.5
[root etc]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet


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CentOS 5 Networking :: Bridging Of Eth0 And Eth1 Doesn't Work?

Apr 14, 2011

Problem: Can't get bridging to work properly.

I'll start by saying that most of this is built inside of a 64bit ESXi 4.1.0 server. Should be obvious by the picture below.

Trying to set up a bridged CentOS box. Ultimate goal is to set up a Transparent Firewall. The machine labeled 'Desktop' is a Windows XP running DHCP. It gets assigned an Internet routeble IP address. At this point, nothing is running a firewall.

Gateway can ping CentOS bridge
CentOS bridge can ping gateway
CentOS bridge can resolve DNS names and ping FQDNs on the Internet.
CentOS bridge CAN NOT ping Desktop


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CentOS 5 Networking :: Intel(R) PRO / Wireless 2200 / 2915 Driver Doesn't Work

May 31, 2009

Wireless networking doesn't seem to work. When I try to create a new network interface with system-config-network, my wireless card doesn't show up. The following comes from dmesg:

ipw2200: Intel(R) PRO/Wireless 2200/2915 Network Driver, 1.2.0kmprq
ipw2200: Copyright(c) 2003-2006 Intel Corporation
ipw2200: Detected Intel PRO/Wireless 2200BG Network Connection
ipw2200: ipw2200-bss.fw request_firmware failed: Reason -2

I saw a post about this elsewhere and downloaded some firmware drives from [URL] and installed then. But, I'm really out of my league when it comes to this kind of stuff.

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CentOS 5 :: Why 'ctrl+a, K' Nor 'ctrl+a Kill' Doesn't Work For Screen Windows?

Oct 3, 2010

anyone has a clue why 'ctrl+a, k' nor 'ctrl+a, :kill' doesn't work for killing one of screen windows? Other screen's commands invoked with 'ctrl+a'seem to work.

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Ubuntu :: Viewing Desktop Using Remote Client (Windows TightVNC) Doesn't Work

Apr 30, 2010

When either of the proprietary Nvidia drivers are enabled, viewing the desktop using a remote client (Windows TightVNC) does not work. The initial remote screen display is ok, but no updates to the remote display occur. Reverting back to the non-proprietary driver solves the problem. I have also tried using a 10.04 Live CD and used Remote Desktop Viewer on the client machine, and it behaves the same way.

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CentOS 5 Networking :: Centos 5.2 / Hyper-V/ Bridge With Synthetic Adapters Does Not Work?

Jan 27, 2009

I have a Centos 5.2 VM running under Windows 2008 Hyper-V. If I add two "legacy Nic's" and bridge them, everything appears to work fine. However, if I remove the legacy nics and replace them with two synthetic nics (linux integration components), the nics seems to function fine UNTIL I add them to a bridge.This VM will eventually be used as a DansGuardian/Squid transparent proxy for a local library. The logical layout is represented by the attached jpg image. I have also included the ifcfg- scripts for the adapters and bridge for both scenarios.It would also be useful if someone else has Hyper-V with the integration components and dual physical nics to see if they can reproduce my symptoms on their box.Legacy Adapters:



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CentOS 5 Networking :: OpenVPN Network Manager PPTP Connect

Sep 15, 2010

I successfully installed openvpn and networkmanager openvpn plugin. Then I successfully added a PPTP vpn connection by networkmanager vpn tab which name is "vpn1". But now I don't know how to connect to this PPTP vpn connection. I tried bellow command but no luck.
openvpn --config vpn1.config

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CentOS 5 Networking :: OpenVPN Multiple Servers With Clients Access

Dec 27, 2010

what is the best way here? I have like 5 servers, and I want my clients to access each of them, so in case 1 server is down, they can access remaining servers. Also, it will work like user1 chooses the server number and is connecting to a central database, then reply is OK, and he can connect to the server number he wished.

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Server :: OpenVPN Client GUI For Windows 7 64Bit?

Feb 9, 2011

I have set up my Openvpn Server in Centos and it is working fine. Windows XP clients are able to connect the OpenVPN Server and access the network. This is a customized OpenVPN Gui Client. Now I need the customized OpenVPN Client for MS Windows 7Bit. I am using openvpn-2.1.4-install OpenVPN Client in MS Windows 7 64Bit. This is a executable and working fine in the said architecture. Now I want to compile this version. I am following the given steps at : [URL].. As per the direction i have copied the source from 2.1.4 and tried to compile, but compiled copy is giving the error " An error occurred Installing the TAP-Win32 Device Driver". I have tried this compilation by making every change and hack but all in vain.

I think that there are some certain steps which are missing and not documented any where. And sure that someone in forum will know the facts.

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Networking :: F5 Firepass Client With Amd64 And Squeeze Doesn't Work

Apr 4, 2011

My university is checking LAN access through F5 Firepass server. Using amd 64 proc with squeeze and iceweasel 3.5.16 browser with F5 Network access plugin and F5 sam inspection host plugin, I cannot access university servers through the F5 firepass server.

From my svpn.log when trying access:

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Networking :: Set A Route For Eth1 - DHCP Clients - To Reach Tun0 - Openvpn Server - CentOS

Sep 21, 2010

I have openvpn tunnel setup between two CentOS servers. One of the CentOS servers also acts as a DHCP server for some client computers.

Server A= OpenVPN server
Server B= OpenVPN client (connects to Server A with OpenVPN)

The two CentOS servers can ping each other ( via the tun0.

However, client computer connected to Server B (DHCP server) can't reach (which is the OpenVPN server).

I think I am missing some routing in my "ip route show". Following is the full picture:

What command can I issue to get this fixed? something along ip route add?

There is no firewall service on both end. service iptables stop! I can't bridge eth1 and tun0 as DHCP server might mess up the other side. I can't do a push of "redirect-gateway def1" because then clients loose their IP as they send DHCP requests to Server A.

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Networking :: Windows Client Browser Doesn't Show Shares / What To See?

Mar 25, 2011

I also am having this problem so any help would be appreciated.

Personally, I don't know if I have anything set up correctly. That would be something I need guidance on if anyone can offer some.

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CentOS 5 Networking :: Accessing Windows PC From Centos

Jul 29, 2011

I have a small network with my Centos 5.6 box and a Win XP PC on it.I can access the files on the PC from the Centos box by bringing up the RUN window (ALT-F2 in Gnome) and typing smb://192.168.1.X/C (where X is the address of the PC), and I get a window with the C: drive from my PC. I can then drag/drop files between the Centos box and the PC. Here are my questions:

1) I want to script the file transfer, so how do I do this from the command line?

2) On the PC, I have 2 drives C, and E. They appear to be set up the same, but the E drive looks empty when I do this using the interactive method above.

I found this tutorial http:[url]..... but I can't get my PC "visible" in the smbtree.Really, I just want to write a script that does a backup on the Centos box and copies it to the E (External) Drive on the PC. (I'm a novice when it comes to administration)

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Fedora Networking :: Connect The Network Where The Openvpn Client Is,throught The Computer With The Client To The Other Network?

May 20, 2009

I have the following problem:I have to networks in remote places.I have an opnvpn client in one network that connects to the the router (openvpn server).My question is,can i connect the network where the openvpn client is,throught the computer with the client to the other network.If yes,how? (please make it an idiot proof anwser because i have limited knowledge about iptables). I was thinking like forwarding (the router in the network with the openvpn client is also firewalling with iptables) the request of the ip class of the openvpn network to the computer with the client,which masquarades the interface

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CentOS 5 :: Yum And Php Doesn't Work After Update To 5.3

Apr 6, 2009

I updated centos from 5.2 to 5.3 as recommended:

yum clean all
yum update glibc*
yum update

Update was successful (I didn't see any errors). Then I rebooted pc and found out that my web is extreamly slow. In httpd logs I found: php -> file_get_contents [URL] always dies (timeout error, but somedomain.com is fine, I can telnet it easy on 80) I was wounder if it's update problem and tried yum:

>yum update Loaded plugins: fastestmirror Determining fastest mirrors Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386&repo=os error was [Errno 4] IOError: <urlopen error (-3, 'Temporary failure in name resolution')> Error: Cannot find a valid baseurl for repo: base

so you doesn't work too... I have no proxies, I tried to reboot pc, I tried: yum clean all

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CentOS 5 :: After Update To 5.5 Yum Doesn't Work

Jun 14, 2010

after i update my Server to 5.5 i get the following error

[root@Linux /]# yum update
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=addons error was
[Errno 14] HTTP Error 407: Proxy Authentication Required
Error: Cannot find a valid baseurl for repo: addons

i export the proxy but still not working,

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CentOS 5 :: Guest OS In XEN 5.4 Doesn't Work?

Jul 13, 2010

1) Installed Cent os 5.4 in my system (name it as "guest os").

2) Downloaded the full kernel source, and patched the vanilla kernel to export symbol table (2 line change) [URL] (Yes I know that kernel should not be touched, if touched you should not seek help here . but I felt I didnt do any big change in kernel there). Besides we unset the config_smp & config_preempt parameter to make the kernel as not SMP and not preemptive .

3) Then compiled and booted with the new kernel 2.6.18, everything went fine . Now my gust os box is loading fine and I dont have any issue .

So now I need to install this above machine as guest OS in one more XEN machine cent os 5.4 (name it as "xen os").

So we created the image out of the above box "guest os" and added it as VM in xen os . But while booting it always hangs under some error like "/usb device sort of thing" (I dont have the screen where it hangs, but I do have the equivalent xen log from XEN OS linked to [URL] .

1) what the error is, and what need to be changed in my guest os build .

2) In general I am new to this VM and XEN installation, to be frank I am completely zero . Does changing the native os 5.4 to guest os need any change in kernel or something.

3) Does this case possible, install plain cent os in xen machine. After then patch the kernel in VM and boot with that . I guess it should not be possible ...

4) If possible guide me to some documentation where I can learn few basics over this.

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CentOS 5 Server :: SMTP Doesn't Seem To Work

Apr 28, 2010

I have a dedicated server running CentOS 5, Plesk 9.2.2, SMTP Postfix and Courier-IMAP.The issue I have is that on all domains on the server receiving email works fine however sending email never seems to work. This is from email programs, my phone, webmail and PHP. None of them seem to be able to send email. If it is of worth Spam Assassin is running however I don't feel it is causing any problems.

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CentOS 5 :: KVM USB Pass Centos6 Doesn't Work?

Aug 22, 2011

I have very annoying problem with USB passthrough in Centos 6. My XLM guest file to forward USB ( I checked this manually and using virt manager) :

<hostdev mode='subsystem' type='usb' managed='yes'>
<vendor id='0x0d7a'/>
<product id='0x0001'/>


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CentOS 5 :: Installed Acronis Agent But Doesn't Work?

Dec 1, 2009

I'm quite new to Linux and totally new to CentOS. I need it to isntall a Lotus Domino Server, and for security reason i'd like to install the Acronis Linux agent to backup this server with my Win Acronis enterprise server. I have installed a new CentOS server 5.4 on a Vmware virtual machine, then installed the Acronis Linux agent following the instruction here [URL].. The agent seems to work because with the command "/etc/init.d/acronis_agent status" the sistem respond with "Acronis Agenti is running"

But i can't connect to the agent from the server console!

I have disabled the firewall to avoid any connectin problem...

Does anybody use acronis with CentOS?

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CentOS 5 :: Why The Selinux Module For Nagios Doesn't Work

Dec 8, 2009

Is there a reason why the selinux module for nagios just doesn't work? I'm running CentOS release 5.4 (Final) and did "yum install nagios" and now have nagios-3.2.0-1.el5.rf installed. I'm having to create policy after policy after policy, and still haven't reached the end of the rainbow.

I suppose after I run out of selinux violations, I could figure out how to combine all of these modules and post the result, but it seems really, really weird to think that I'm the only person who has ever installed nagios from the repo with SELinux enabled.

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