CentOS 5 Networking :: Unable To Access Company Vpn?
Mar 8, 2011
I am trying to access my company VPN using my Centos 5.5 laptop. I have the vpn client certificate issued by my company's IT dept. I am able to access the webmail using the same certificate which I installed in firefox. But I would like to know how to use this certificate to sign in to the VPN. Some of my colleagues use the Cisco VPN client v5.0.? software and the vpn client certificate to login. It works fine. But I would like to do the same with Centos.I tried connecting using vpnc. I converted the pcf file to conf using pcf2conf. Converted the certificate to .pem file. I replaced the /etc/vpnc/default.conf file with the pcf2conf converted file. Following is the converted conf file:
IPSec gateway example-vpn.companyname.com
IPSec ID <groupid>
IPSec secret <groupsecret>
[code]....
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Oct 5, 2010
I am attempting to setup my home ubuntu-box (10.04, 64bit) to vpn into work (cisco).My attempt has been partially successful - connecting successfully to shared drives - but I can't access the internal company sharepoint site (using network-manager-vpnc). When I enter the URL into firefox, it tries for a few seconds then displays the "connection was reset" error page (see attached). I don't even get the normal pop-up dialog asking for my credentials! The URL is resolvable to an IP, and the server can be pinged successfully.
So, to make sure my home network wasn't to blame, I brought home a work laptop with a windows vpn client. This worked fine.I then went to work with Ubuntu-NR on a USB stick and booted up into ubuntu to make sure ubuntu wasn't to blame. This worked fine
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Jan 13, 2011
we hav one of our client want access our company computer from outside network and all our computers are under proxy server therefore all computers have limited access so one of the limited access computer, client has to access from outside. so we want this computer should remain under proxy server as well as accessible from outside network
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Jul 4, 2010
On my Centos 5 box my internet won't work. I am unable to get update and I can't download any native programs. But I have Samba running and I am able to access all my files for my other computers.
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Jan 17, 2009
I've installed centos 5 on an old computer with success and it works great.I can access the web server hosted on the centos server from any computer on the wireless and wired local network. I can also use ssh (putty) and nx client from any computer on the local network (wired and wireless) to access the centos server.On the wireless router I've configured a port forwarding to the wireless network interface on the centos server. I can access the centos server from the outside (internet) through this port forwarding both through http and ssh or nx client.MY problem is that I can't access the centos server from the internet through the wired network interface. Any attempt to view a web page or login with ssh or the nx client will timeout.
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Oct 27, 2010
From my office and home, I can access a web service, no problem. However, from my server at the data center, I cannot. Could this be a DNS issue? I've tried with iptables enabled and disabled. selinux is disabled. This server has multiple network interfaces, one public and two private. The public has a WAN IP address (1.1.1.1), the private is 10.1.10.2 and the other private is connected via crossover cable to another server 192.168.100.1. I think route -n tells me the WAN interface is used to access the internet, as its gateway is my ISP's upstream gateway. CentOS 5.5.
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Jul 4, 2010
Unable to get update or download any native programs. But able to access file from Samba
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Mar 24, 2010
a client asked me to install ettercap on their linux gateway machine - two ethernet machine. I tried it in bridged mode, it but as soon as I start it, the traffic stops and no one can access anything. Did anyone ever succeed in running it on the gateway?
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Jun 12, 2009
I've been running a Samba server under RedHat 8 for five years without a hiccup. I want to cut over to a F10 box but cannot get shares accessible. smbclient attempts fail over NT password error. SELinux is disabled. Server is visible on the network. Users require no password access to shared data.
smb.conf follows:
# Samba config file created using SWAT
# from UNKNOWN (>)
# Date: 2009/06/12 14:15:15
[code]....
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Dec 31, 2010
I managed to configure my W890i phone to get access to internet through an ubuntu-based computer. It's very easy to use the phone to give internet access to the computer, but the opposite is quite more tricky. For that I've done the following
----On the phone---
-Set the USB network option to "through computer", so that the phone uses the computer's internet connection and not the opposite.
-Decide and set "Shared Network" parameters: user, pasword and workgroup.
-In "conectivity-> internet connection" set "allow local network" to "yes"
----On Ubuntu 10.04---
-Install samba, samba-client, smbfs, smbclient, firestarter and dhcp3-server
-Configure Samba (System-> Administration-> Shared folders): same workgroup as in the phone, add new user (the phone), passwd this new user. In my case the user was called "w890i" and the password given was the same.
-Once the phone is connected to the computer through USB (then select "phone mode"), a new connection appears in NetworkManager: usb0.The aim is to create a shared network that gives internet access to this device. Edit the IPv4 parameters of this new connection, set them to Manual and give an IP adress (192.168.0.1) and a subnet mask (255.255.255.0); the rest of the fields are left empty.Connect this network.
-Set firestarter to use dhcp3: sudo ln -sf /etc/init.d/dhcp3-server /etc/init.d/dhcpd
-Launch firestarter and follow the wizard. Set "allow internet shared connection", choose the device for the primary internet access, and then the device for the shared network (usb0). Then change the settings for firestarter: activate DHCP for local network, set IP to the one we gave before (192.168.0.1).
-Open dhcp3-server config file sudo gedit /etc/default/dhcp3-server And set INTERFACES="usb0"
-Set the policies of firestarter: in incoming connections, allow connections from the IP adress given to the phone (192.168.0.1). Then add rules for the ports that need to be open for this connection. I opened HTTP, HTTPS, SMB, SMTP, POP3, IMAP, IMAPS, DHCP for all the connections in the local network.
-Apply policies and start the firewall.
------------
After all this, the phone can access the internet through the computer. Two problems appeared:
1. I couldn't get access to https sites, like webmails. The phone gave a "communication error". But then I tried with Opera instead of the browser built in the phone's firmware, and I could finally get to https sites.
2. I couldn't retrieve mail, neither POP nor IMAP nor IMAPS. I thought it was a firmware problem again, and I tried out several mobile phone email clients written in java, but none of them worked.
So this is at the moment the problem. If I connect from the phone to the internet directly through 3G, the email clients work for all my accounts. I don't think it's a firewall problem, because the ports are opened for this connection
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Dec 8, 2009
I set up freenx server and set up a client on same machine and now when I go to my logs it crashs and bugzilla save before it can crash. I go to send info and the page says bugzilla wont work and gives a 999 code need newer gnome??
**this is when I go to the logs page
Distribution: CentOS release 5.4 (Final)
Gnome Release: 2.16.0 2007-02-18 (CentOS)
BugBuddy Version: 2.16.0
[Code]....
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Jul 6, 2011
I am buying a server 2 day ago and installed CentOS 5 (64 bit) . But i have a problem .My server FTP have folders :
_________________________
maildir
admin_backups
domains
imap
public_html
user_backups
__________________________
I cannot access usr / local directory.usr / local directory, how can I access? usr / local does not appear FTP.And i get an error : libmysqlclient.so.15
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Dec 3, 2010
When I try to connect to my company's VPN using the Cisco VPN client, I get a kernel panic. Please don't suggest I should Cisco's client, it only works with Kernels older than 2.6.24 (I have 2.6.35).
So I use vpnc. The error message is:
Quote:
$ sudo vpnc
[sudo] password for phirt:
Enter password for user@group@fubar.net:
received notice of type (ISAKMP_N_NO_PROPOSAL_CHOSEN)(14), giving up
vpnc: quick mode response rejected: (ISAKMP_N_INVALID_MESSAGE_ID)(9)
this means the concentrator did not like what we had to offer.
Possible reasons are:
[Code]...
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Jun 30, 2009
We have a server were we no longer seem to be able to gain access, neither locally or remotely.When we try to connect via SSH we get a "Connection Refused". We have checked that it's not our standard firewall blocking the request, so it can either be the local firewall (which we disabled when installing) or that the process isn't running.However, when we try to login locally on the machine (as root) all we get is "Login failed". We've tried restarting the machine in single user mode to change the root password, and while we can do this succesfully, it still doesn't give us access when rebooting the machine afterwards.No other users (besides the standard users created when installing) are available on the server, so we can't say if this is a problem with the root account, or with logging on in general.
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Mar 7, 2011
I'm running CentOS 5.5 with a hardware Areca controller (Raid 10). I initially installed a machine and rsynced the file system to a third machine; I'm then pulling in the file system to new machines and updating grub with a script to make it bootable.
I've done this before with other machines (no raid sets) but with these machines I'm running into errors code...
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Sep 23, 2011
I face a problem with my server after i rebooted it i got a message on start up tell me that " Unable to access resume device (label=swap-sdb3) " and the system doesn't startup
the error message exactly is
Unable to access resume device (lable=swap-sdb3)
Creating root device.
Mounting root filesystem.
[ 3.305354] EXT-fs (md1) : error : unable to read superplock
mount: error mounting /dev/root on sysroot as ext3 : invalid argument
[Code]....
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Dec 20, 2010
I have the problem with Ubuntu to access the local site within my company network. This network has access to Internet, but the company's site does not have a public address. It is like "http:e-learning.local". I can access this site from any windows machine, but I can't access it from ubuntu. Only if I use IP address, I can access it. However, I have normal access to other sites on the Internet.
Do you have any suggestion how to solve this problem?
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May 28, 2010
I am running a VPS of CentOS. clock command doesn't work.[174-37-247-102.lx-vs.net ~]# clock hwclock is unable to get I/O port access: the iopl(3) call failed. How to solve the problem? I have tried "timeconfig" and set to New York and System Clock uses UTC and restart the server but it was not useful.
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May 31, 2010
This is Mushtaq here. I am using CentOS 5.3. Everything works fine regarding Hardware Support except of External Hard Disk. I have a HDD Western Digital 80 GB in USB converted case. Its working fine under WinOS, Fedora 10 / 11 / 12 + & RedHat Enterprise Linux. But CentOS is unable to access it even it does not detect it (fdisk -l command is used to verify the connected disks). Can any one please help me in this regard, I am fed-up of this situation.
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Jun 27, 2011
Problem:Your company network has internal only hosts / websites with names that end in .local, e.g.Your freshly installed Ubuntu machine works fine on the network, has internet access, etc. but cannot connect to these particular systems.Testing DNS with tools like dig / nslookup works fine, but normal name resolution with ping / telnet / browsers does not work.Solution:1. Open a terminal window2. Enter the command sudo nano /etc/nsswitch.conf3. Change the following line:hosts: files mdns4_minimal [notfound=RETURN] dns mdns4to this:hosts: files dns4. Press Ctrl-X, Y, Enter to saveExplanation:Ubuntu ships configured to do name lookups for self-configuring networks, based on the AppleTalk / mDNS / Bonjour protocol. In the configuration shipped for the resolver, this protocol is considered the final aurhority for the ".local" top level domain, and DNS will not be checked. The above configuration change eliminates this and restricts lookups to (a) /etc/hosts file, followed by (b) DNS
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Sep 9, 2009
I have an MSI K9A2 Platinum mobo, which has a 10/100/1000 Fast Ethernet Realtek 8111B built-in, a D-Link DIR-655 Router and a DSL modem. Compared to Windows Visya and other Linux distros ( Fedora 11, Suse 11.1, Mandriva 2009.1 ) access to the internet is much slower. It seems there is a noticeable delay when running CentOS 5.3. before internet access kicks in each time I am surfing the web or updating my system.
Is there any way I can speed things up, or determine why CentOS 5.3 seems much slower ?
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Jan 23, 2010
I can't be the first one with this problem. What am I missing?
I have setup Samba servers in the past, just none under SELinux. The last one I configured was a couple years ago, so I wouldn't doubt I'm a bit rusty.
---- Environment summary:
Clean server install of CentOS 5.4 includes SELinux
- lets call this 'server'
- updated samba to 3.0.33-3.15.el5_4.1
Client1 - Windows XP sp4 - WINS configuration uses 'server' noted above
Client2 - Windows Vista - WINS configuration uses 'server' noted above
---- What works / what doesn't ------
Clients can see the server (XP and vista) in network neighborhood.
The following does not work from windows (xp or vista)
net view
net view \server
net view \server-ip
net view \servershare
This does work on the server
smbclient -L \server
smbclient -L \server --user validuser
smbclient -L \client1 --user validuser
---- What I have configured and tried (config/output below) --------
firewall ports for samba are open
SELinux enforcing or permissive
file context is set on share
samba booleans are set
***firewall
-A RH-Firewall-1-INPUT -s 192.168.0.0/24 -m state --state NEW -m tcp -p tcp --dport 445 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/24 -m state --state NEW -m udp -p udp --dport 137 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/24 -m state --state NEW -m udp -p udp --dport 138 -j ACCEPT
-A RH-Firewall-1-INPUT -s 192.168.0.0/24 -m state --state NEW -m tcp -p udp --dport 139 -j ACCEPT
***SELinux mode/booleans
# sestatus
SELinux status: enabled
SELinuxfs mount: /selinux
Current mode: permissive
Mode from config file: enforcing
Policy version: 21
Policy from config file: targeted
# getsebool -a | grep smb
allow_smbd_anon_write --> off
smbd_disable_trans --> on
# getsebool -a | grep samba
samba_domain_controller --> on
samba_enable_home_dirs --> on
samba_export_all_ro --> off
samba_export_all_rw --> off
samba_share_fusefs --> off
samba_share_nfs --> off
use_samba_home_dirs --> on
virt_use_samba --> off
***filesystem
# semanage fcontext -a -t samba_share_t �/share/photos(/.*)?�
# restorecon -R -v /share/photos
***Disks
]# df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 9920624 2070872 7337684 23% /
/dev/sda1 101086 19146 76721 20% /boot
tmpfs 1846656 0 1846656 0% /dev/shm
/dev/mapper/VolGroup00-xen
100791728 202540 95469188 1% /xen
/dev/mapper/VolGroup00-photo00
251981556 191716 238989840 1% /share/photos
/dev/mapper/VolGroup00-dmsdoc00
100791728 192256 95479472 1% /share/alfresco
none 1846656 104 1846552 1% /var/lib/xenstored
***smb.conf
[global]
workgroup = workgroup
netbios name = server
security = user
name resolve order = wins hosts lmhosts bcast
encrypt passwords = yes
hosts allow = 192.168.0.
hosts deny = 192.168.122.
interfaces = eth0
passdb backend = tdbsam
oslevel = 222
local master = yes
domain master = yes
preferred master = yes
cups options = raw
username map = /etc/samba/smbusers
wins support = yes
log level = 4
guest ok = yes
[photo]
comment = Photos
path = /share/photos
read only = yes
guest ok = yes
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May 30, 2011
i am not able to port 8080 on my CentOS VPS server.I have followed all the instuctions as mentioned on iptables wiki page.Also I am able to telnet my ip address and port number, But can not access from browser.
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May 27, 2009
I installed fedora 10 and shut it down after failing to have ..... run to it. later when I turned on the computer after loading 100% a black screen comes up and i cannot access any further. How can I solve the problem without reinstalling the OS.
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Jul 18, 2010
I can see the workgroup of Windows Network from Ubuntu, but when i put the username and password of Windows 7 from Ubuntu it doesn't get any access to the shared folders. I don't know where the problem is for not getting the username and password accepted or authorization.
I even tried turning off the password requirement in Windows 7, but no luck.
My Documents are shared on Windows 7
Something must be missing cuz I can see the Windows 7 computer on Ubuntu but the login fails all the time.
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Sep 22, 2010
I am using Ubuntu 10.04. My problem is that I am unable to access my internet using Ubuntu. My internet is running fine on Windows 7 installed on same system. I am a bit unfamiliar with Linux. I tried to configure my network settings but it didn't help. I have my system connected to my dsl router via LAN.
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Jan 13, 2011
At, or around, the time of upgrading from Lucid to Maverick, shares on some of my nfs servers have become inaccessible:
Code:
peter@Desktop:~$ ls /net/10.2.1.21/
opt
peter@Desktop:~$ ls /net/10.2.1.21/opt/
sybhttpd
[Code]....
The share is hosted on a PopcornHour Network Media Tank, running a Linux system. With Lucid, I was able to access the share without any problems, both in Nautilus and from terminal. I can still access the share from other nfs clients - it's just ubuntu/Maverick which exhibits this problem. I have tried reverting to older firmware on the PopcornHour but that doesn't make any improvement.
Was there some significant change in nfs with the Maverick release, or have I misconfigured something?
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Aug 3, 2010
Currently I am using HP NAS box and we have installed HP Storage Works storage Mirroring on NAS for Replication. Windows 2008 is installed on this NAS box. I have shared a directory as NFS share on this NAS box and allow anonymous read and write access to all machines. I want to mount and access this NFS share directory on one LINUX machine and this Linux machine has Redhat 5.3 Enterprise edition.
1.The issue I am facing here is, I can mount the NFS share on my Linux machine successfully but I can not do read/write on this NFS share. Whenever I try to access this mounted NFS share, I always get error Permission denied. I can do any read/write operation on this mount point. Please provide the inputs to resolve this issue.
2.How do I mount NFS share with user credential and password? Can I share a directory as NFS share with user credential which I can use when I mount the share? 3.Is there any other way to access NFS share by using user authentication and password?
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May 31, 2011
I have a weird issue where all of the machines in my office can all connect to our web server, either via DNS or using the server IP directly. However, on my machine, which is using the same network IP as the rest of the office and I know it's not being blacklisted, I can't access the server at all via SSH or web or mail. I'm the only machine running Linux, I've flushed the network cache using nscd, but this made no difference. Can anyone think of what might be going on here?
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Jun 16, 2009
Fedora 11 is completely unable to access the internet for some reason, and after some troubleshooting, I've determined the problem to my Motorola 2210 DSL modem. I know my connection is working fine, as it works perfectly in both Vista and 7. I've tried things such as grep 'Ethernet' /var/log/dmesg, filling in the information into the network settings manually, to no avail.
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