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• VPN ipsec tunnel from router to single windows server computer (gateway-to-host)

  - by Chris Miller

  Firstly, is this possible? The situation: 2 different ISP's. One has several servers and a firewall running. The other is limited to only one virtual server with one network card running windows server 2008r2. I need to set up a site-to-site style VPN using IPsec between the firewall of one ISP and the windows host on the other (gateway-to-host). This host has to run a SQL-Server that I can access from the other ISP's servers through the VPN tunnel. It seems looking at the RFC for IPsec that this should be possible using the features of Windows 2008, but I can't get it to work so far... It seems that I can't access any services running on the same computer or IP address used as the tunnel endpoint? Thanks Chris

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• Any way to stop VMWare workstation from dropping SSH connections?

  - by oljones

  I have VMWare workstation 8 with a few Linux guests. I have had problems maintaining an active SSH connection to my VMs when they are in bridged mode. I first read that the onboard realtek network cards were not well supported so I bought a Intel Pro/1000 GT card. This supposedly had support. But this made no difference. Connections via SSH are active for about the first 3 minutes then hang and die. I have changed the TCP Checksum offload on the Intel and Realtek NICs, but this only works some of the time and even then not for very long. The best I could do was about 20 minutes before the connection was dropped. Any ideas?

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• Computers displaying an unwanted password change prompt

  - by evesirim

  We run a small network of users from a central SBS 2008 server that handles group policy & AD. Most of our users operate under a policy that propts them for a password change every 6 months as a security measure, with a few administrator accounts & terminal machines not using the policy for the sake of ease as they are needed all the time. Recently all machines regardless of policy have started asking for a password change out of schedule. Some PCs run Windows 7 & some XP, though the password prompts don't seem to discriminate between OS. What could this be down to? Many thanks

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• Why is apt-cache so slow?

  - by Damn Terminal

  After upgrade to Trusty (14.04) from Saucy (13.10), all apt operations are very slow. Even those that do not include downloading anything, or connecting to any servers. For example, displaying the apt policy # time apt-cache policy [...] real 0m8.951s user 0m5.069s sys 0m3.861s takes almost ten seconds! Mostly a weird lag right after issuing the command. And it's the same even if I issue the same command again. On another system it doesn't take a tenth of a second real 0m0.096s user 0m0.070s sys 0m0.023s The other system is a little beefier but there was no noticeable difference before the upgrade. It's the same with apt-get, anything apt-related. How do I find out the source of this lag and fix it? Additional info: # cat /etc/nsswitch.conf # /etc/nsswitch.conf # # Example configuration of GNU Name Service Switch functionality. # If you have the `glibc-doc-reference' and `info' packages installed, try: # `info libc "Name Service Switch"' for information about this file. passwd: compat group: compat shadow: compat hosts: files dns networks: files protocols: db files services: db files ethers: db files rpc: db files netgroup: nis BTW is my understanding of how apt-cache works correct? It doesn't make any network connections when I run apt-cache policy, right? In case I'm wrong and it matters, here are my sources https://gist.github.com/anonymous/02920270ff68e23fc3ec

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• Automatically connect to 3G dialup connection

  - by Philipp

  I have a notebook with an internal 3G modem (a HUAWEI Mobile Connect) which appears to the system as a dialup modem. When I want to connect to the Internet, I need to open the charms bar, click settings, network, the modem and "connect" to open the dialup dialog on the desktop. When the connection is interrupted for some reason, I need to repeat these steps. Is there a way to configure Windows 8 to automatically (and preferably silently in the background) connect with this modem at system startup and automatically restore the connection should it get interrupted? As an operating system which is developed for mobile devices, I would expect it to be able to somehow be able to manage a always-on 3g connection.

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• How to route traffic through a VPN tunnel?

  - by Gabriel

  The problem with our server is that we need to use the bug ridden and awful AT&T network client, which causes our server to bluescreen once per 24 hours. Does any one know how to (or has a good guide) quickly set up a workstation running Windows server 2008 R2 as a proxy server. So this spare workstation would run AT&T and would act as a bridge between our server and the server that can be connected to only via the AT&T VPN software. And this way our own production server would not crash so often (or not at all) and the workstation can happily crash whenever it wants to.

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• Restrict VPN Clients to VPN Server

  - by Sprotty

  I've setup a VPN server using Debians pptpd. This all works, but I want to restrict incoming connections so they can only access ports on the VPN server and not get access to other machines on the VPN servers local network. I'm guessing this is a firewall rule? but i'm new to linux so am struggling a bit... ---- Additional info ----- The VPN Server is also hosting an SVN server, which is its real purpose, and the only service I want it to expose to incoming connections. I guess I could expose the SVN server directly, but I'm not confident that I could secure this correctly, so a VPN seemed to give an additional layer of security.

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• Cisco Router 1921

  - by mytempfw

  I'm very new in networking and I'm trying to setup my network as follow [ISP Modem/Router/Switch] + --- + {fxp0} [Linux Firewall] {fxp1} + --- + {??} [Cisco Router 1921] {GE 0/0} + --- + [Cisco Switch] + ... Servers {GE 0/1} + --- + [Cisco Switch] + ... Servers My questions are, Since I'm using both GE 0/0 and GE 0/1 ports to connect to switch, how can I connect my Linux Firewall (Port fxp1) to my Cisco Router? I know the USB and Console port are for configuration, can I use AUX port to connect my firewall (if so is it consider a right way)? Is my setup is right? if not can someone please explain to me to do the setup in right way. Link to the picture of my router: Cisco Router 1921 Thanks

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• Wifilink 5100 AGN mass update

  - by ripwads

  We are using a Meru enterprise wireless network with 180 APs. Recently, many users connections are dropping frequently. After much troubleshooting, we have determined much of the trouble is due to some settings in the advanced properties of the wireless nic on our notebooks. Now we want to send out the changes in a Zenworks bundle, but I cannot find these settings in the registry or anywhere we might be able to send out as a remote package. Does anyone know where to find these settings for an Intel wifilink 5100 card other that the NIC properties itself? We really do not want to manually configure 600 notebooks.

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• Ethernet port sleeping on PS3 running linux

  - by Doug

  My lab has a PS3 running Ubuntu Linux 9.04 Server Edition. After a period of a few hours with no use, the Ethernet connection (eth0) seems to go to sleep, causing the connection to be lost. Pinging or trying to SSH into the machine results in no response. The fix I've been using is to access the machine locally and restart it (trying to bring eth0 down then up doesn't seem to correct it). I've tried setting up an hourly cron job that runs on the PS3 and pings another machine just to create network activity, but this doesn't seem to solve the problem either. Update: The solution was to run the above cron job much more frequently: every 10 minutes works.

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• What to do when 'dpkg --configure -a' fails with too many errors?

  - by rudivonstaden

  During an upgrade from lucid (10.04) to precise (12.04), the X session froze, and I have been trying to recover the upgrade to get a stable system. I have performed the following steps: Used ssh to log in to the stalled system over the network. Checked the contents of the /var/log/dist-upgrade directory. There was no activity on main.log, apt.log or term.log. top showed that process 'precise' was using about 3% CPU, but I could find no evidence that the upgrade process was still doing anything. 'dpkg' did not show up in top, but it came up with pgrep dpkg | xargs ps Killed the 'dpkg' and 'precise' processes Tried to recover the upgrade by running sudo fuser -vki /var/lib/dpkg/lock;sudo dpkg --configure -a. This was partially successful (some packages were configured), but failed with the message Processing was halted because there were too many errors. I ran the same command a few times, and each time some packages were configured but others failed. Tried running sudo apt-get -f install. It fails with similar errors to dpkg. The current situation is that dpkg --configure -a and sudo apt-get -f install fails with two kinds of error: Dependency issues, e.g.: dpkg: dependency problems prevent configuration of cifs-utils: cifs-utils depends on samba-common; however: Package samba-common is not configured yet. dpkg: error processing cifs-utils (--configure): dependency problems - leaving unconfigured Resource conflict, e.g.: debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable Additionally, it seems there's reference to potential boot problems, so I'm not keen to reboot without fixing the install first: dpkg: too many errors, stopping Processing triggers for initramfs-tools ... update-initramfs: Generating /boot/initrd.img-3.2.0-25-generic cryptsetup: WARNING: failed to detect canonical device of /dev/sda1 cryptsetup: WARNING: could not determine root device from /etc/fstab So my question is, how to get a working install when dpkg --configure -a fails?

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• Have two exchange servers to communicate together

  - by Data-Base

  We have Exchange Server 2007 using our domain ddd.com. We created an isolated network with a firewall/gateway and installed a DC and Exchange Server 2010 using a demo/test domain (ddd.loc). We opened all the needed ports in the firewall (10.10.2.88) to the Exchange Server 2010. In our main Domain Controller (10.10.2.3) we defined the domain ddd.loc with IP 10.10.2.88 (firewalls). We also we defined MX records to the same IP (10.10.2.88) We did that so when we send email from my email [email protected] it will go to the Exchange Server 2010. Anyways, all the pings test from to any servers are OK. But we are not able to send or receive emails. Between these Exchange Servers we can not send any email from the 2010 to any email in general (emails are pending). Also, in Exchange 2007 we are getting error #550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

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• Computers displaying an unwanted password change prompt

  - by evesirim

  We run a small network of users from a central SBS 2008 server that handles group policy & AD. Most of our users operate under a policy that propts them for a password change every 6 months as a security measure, with a few administrator accounts & terminal machines not using the policy for the sake of ease as they are needed all the time. Recently all machines regardless of policy have started asking for a password change out of schedule. Some PCs run Windows 7 & some XP, though the password prompts don't seem to discriminate between OS. What could this be down to? Many thanks

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• Very slow accessing printer shared from Windows Machine

  - by Tarski

  How do I go about debugging a networking problem where the office printer is shared off a Windows XP PC and is very slow from me to access? Print/changing any settings can take several minutes and applications often display "Not Responding" in this time. My machine is a Windows Vista PC. The other PCs in the office are either Vista or XP and do not suffer from any printing problems. I am not experiencing any other network related problems, I can access the web and e-mail fine. The printer is a HP officejet Pro 8000

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• ubuntu 12.04 - keep getting "Server not found" for some websites

  - by android developer

  ever since last week , i've noticed that many websites cannot be accessed , and it doesn't matter if i use firefox or chromium as a web browser . as an example of such a website is: http://tutorials-android.blogspot.co.il/2011/05/layout-animation-in-android.html all i get is a "Server not found" error page . sometimes after a few refreshes it works just fine . i've checked it on a windows OS machine that is connected to the exact same LAN network , and the website is shown just fine . i've also checked the /etc/hosts file and it doesn't contain anything suspicious . what is going on? how can i fix it?

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• Only ONE Outlook 2010 installation "Cannot connect to Exchange server" when setting up new profile.

  - by Johnny PDEX

  Exchange 2010, one-server installation (small production, I know not best practice) OWA Connectivity has been confirmed, Autodiscover is configured and working properly for EVERY other installation. Other user accounts tested on problem Outlook, none can connect. Windows Firewall is pre-configured by Group Policy, only modifications being related to remote management. Firewall has also been disabled during diagnostic period. Network discovery and file sharing is enabled on workstation as well. Windows 7 Professional, latest updates installed. Driving me nuts. Help, serverfault?

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• HAProxy and Intermediate SSL Certificate Issue

  - by Sam K

  We are currently experiencing an issue with verifying a Comodo SSL certificate on an Ubuntu AWS cluster. Browsers are displaying the site/content fine and showing all the relevant certificate information (at least, all the ones we've checked), but certain network proxies and the online SSL checkers are showing we have an incomplete chain. We have tried the following to try to resolve this: Upgraded haproxy to the latest 1.5.3 Created a concatenated ".pem" file containing all the certificate (site, intermediate, w/ and w/out root) Added an explicit "ca-file" attribute to the "bind" line in our haproxy.cfg file. The ".pem" file verifies OK using openssl. The various intermediate and root certificates are installed and showing in /etc/ssl/certs. But the checks still come back with an incomplete chain. Can anyone advise about anything else we can check or any other changes we can make to try to fix this? Many thanks in advance... UPDATE: The only relevant line from the haproxy.cfg (I believe), is this one: bind *:443 ssl crt /etc/ssl/domainaname.com.pem

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• Business Forces: SOA Adoption

  The only constant in today’s business environment is change. Businesses that continuously foresee change and adapt quickly will gain market share and increased growth. In our ever growing global business environment change is driven by data in regards to collecting, maintaining, verifying and distributing data.  Companies today are made and broken over data. Would anyone still use Google if they did not have one of the most accurate search indexes on the internet? No, because their value is in their data and the quality of their data. Due to the increasing focus on data, companies have been adopting new methodologies for gaining more control over their data while attempting to reduce the costs of maintaining it. In addition, companies are also trying to reduce the time it takes to analyze data in regards to various market forces to foresee changes prior to them actually occurring.   Benefits of Adopting SOA Services can be maintained separately from other services and applications so that a change in one service will only affect itself and client services or applications. The advent of services allows for system functionality to be distributed across a network or multiple networks. The costs associated with maintain business functionality is much higher in standard application development over SOA due to the fact that one Services can be maintained and shared to other applications instead of multiple instances of business functionality being duplicated via hard coding in to several applications. When multiple applications use a single service for a specific business function then the all of the data being processed will be consistent in terms of quality and accuracy through the applications. Disadvantages of Adopting SOA Increased initial costs and timelines are associated with SOA due to the fact that services need to be created as well as applications need to be modified to call the services In order for an SOA project to be successful the project must obtain company and management support in order to gain the proper exposure, funding, and attention. If SOA is new to a company they must also support the proper training in order for the project to be designed, and implemented correctly. References: Tews, R. (2007). Beyond IT: Exploring the Business Value of SOA. SOA Magazine Issue XI.

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• Do all mods simply alter game files? [on hold]

  - by Starkers

  When you install some mods you drag certain files into your game directory and replace the files. Other mods, though, come with an installer where you can set parameters first. Does the installer then go and automatically replace the certain files? At the end of the day, is that all the installation of any mod is? Is the installation of a mod simply the replacement of certain files inside the game's root directory? Do mods exist which don't fit the above statement? That install outside the game's root? Why do they do this? All the mods I can think of do just replace certain files inside the game's root. However, I know Team Fortress was spawned from a multiplayer halflife 1 mod. Do you reckon that mod installed files outside the root to enable multiplayer via a network for a single player game? How rare are these mods? Or do they not even exist? Do even extensive mods make all their changes inside the root?

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• Accessing non-port80 web server using IPv6

  - by logain

  In a normal IPv4 network, I can go into any browser such as Firefox and browse a server on a IPv4 address not hosted on port 80: (add http:// - Super user stops "new" users from adding links)192.168.42.6:8080/ This accesses the server on Port 8080 on 192.168.42.6. However, if I try this with a IPv6 IP, I get no luck. This tries to access port 8080 on fe80::520:ff0f:ece0:1 : http://[fe80::520:ff0f:ece0:1]:8080/ Firefox will automatically "fix" this URL to: http://[www.fe80::520:ff0f:ece0:1.com]:8080/ which does not help me access it at all. So either I am doing something really wrong OR there's something really wrong with IPv6. Couldn't find anything that even remotely helped on the Internet. (And yes, there is a server running on the IPv6 in question)

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• Monitor ESXi hosts with Nagios

  - by Kyle Brandt

  Does anyone recommend any methods for monitoring ESXi 4.1 hosts with Nagios? I have looked into SNMP but it seems to be in a pretty sorry state. Net-SNMP does not seem to be included and there is a built it SNMP daemon that I set up. However from the standard MIBs there only seems to really be network interface counters and the VMWare MIBs seem quite useless. Right now I am considering SNMP for the interface speed and trying the plugins listed at http://unimpressed.org/post/96949609/monitoring-esxi-performance-through-nagios . Anyone have a better idea? I would like to monitor the hosts directly, not through something like vCenter.

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• cannot boot Ubuntu after fresh install

  - by Jonathan

  I just installed Ubuntu on a Lenovo v570, and cannot boot into the system. All I get is a loop, where some (bios) info is displayed, and then the computer asks me where I would like to boot from. I tried reinstalling, reinstalling with a custom partition scheme, and boot -repair after the install. None of these work. I can see the files on my harddisk have been copied. I have installed many Ubuntus in the past, as well other distros where custom partitioning is required. I don't know where to find any useful information since I don't even get too the grub menu. One odd thing I noticed. The bios now had options to boot USB, OpenSuse,Fedora, or the HD. I am not dual booting. I also realized that the boot info is for a network boot, which means the computer is not recognizing what to boot. It is boot an HD problem, because I can install other OSs just fine. I am completely stumped. I would like to settle this, and end up with a tutorial, that explains to me what happened.

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• NFS Issues in Gnome

  - by Alex

  I mount NFSv4 export via /etc/fstab and mount and use the shared folder in nautilus. There are two issues: When I copy a large file (around 4 GB) to the NFS server, the progress bar rapidly goes to 2 GB and then basically stops moving. But the copy s still in progress - it is just not displayed well When I disconnect from the network without unmounting the nfs share, nautilus freezes. How can I work around that? /etc/export on the server /export/share 192.168.0.0/24(rw,sync,insecure,no_subtree_check,anonuid=1000,anongid=1000) /etc/fstab on the client: server:/share /mnt nfs4 soft,tcp

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• Windows 7 - Wireless connection before login possible?

  - by EJ

  Is there a way for Windows 7 to connect to a wireless network before a user has logged in? I have found no good answers to this question elsewhere. Some say it should already be happening if I am using Windows' connection management (WLAN AutoConnect, formerly WirelessZero), but I am using that, and it is not. I can sit at the login screen for as long as you please and it will not connect (watching the router from a separate PC), moments after I login it will connect. Others have said that you need to use the manufacturer's connection management (not Windows'), and they can sometimes have the option for prelogin/prelogon connections, but I am using generic drivers. The device is a Netgear/Cisco WMP300N, with a Broadcom chipset. Netgear/Cisco and Broadcom all claim to not have drivers for Win7, but Win7 apparently comes with a functional driver.

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• Lost support for Web Access on Verizon BlackBerry World Edition

  - by Jimsmithkka

  Hello all, I believe that some silliness has occurred with my blackberry after a OS upgrade. I have 2010 Blackberry world edition phone, purchased off a friend who went iPhone, that at first worked with web on the Verizon network. When i connected it to my PC to transfer contacts, it prompted for an OS upgrade, which I performed. Post-Upgrade I have found that i can no longer access any of the web services: eg. AppWorld, Email, Twitter, Browser. And they all state that i need to upgrade my account to gain access. I had a Storm previous to this that worked fine, and at the VZ store they told me this device is no longer supported (new in 2010 though), and they got me a free "upgrade" to the Blackberry flip. What i could use help with is finding a source stating it is discontinued or a guide that will help me re-enable the web features. I can provide further info later if needed (currently at work with the flip, the WorldEdition is at home).

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