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• What is the best way to auto failover to backup WAN link for web server

  - by user66735

  Hi Iam looking for the best way to ensure my server ( application ) remains available for all my users (on web/LAN/WAN ), when my primary ISP link fails. My server is behind a firewall on which both my primary & secondary links land. I have already assigned multiple IPs (both ISP's static IP) to the 'A' record ( host.example.com ) in the DNS. However in a round robin scenario is there a way I can ensure that my web user will not see a "cannot dislay web page" error ever ?? What are the better methods to achieve this??

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• Question regarding IPv6 - Solicited-Node Address with a Link local scope

  - by Pulse

  Situation: A small LAN comprising a Windows 7 Ultimate x54 PC, 2 XP Pro x86 PCs and an Asus router.The Win 7 box has IPv6 enabled. There are no other IPv6 enabled devices on the LAN. In my firewall I see numerous requests originating from the Win 7 PC, which are for the Multicast address ff02::1:ff.... which is a Solicited-Node address query and has a scope of 2 which equates to the local link. As far as I knew local link addresses are filtered by routers, hence local link. Given that situation I'm wondering why I'm seeing these queries being generated to various addresses? Any ideas? Thanks.

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• My computer is playing audio without any program open

  - by super x man

  This is the weirdest thing ever that has happened to my computer (running Windows 7). I haven't installed anything lastly, except lavasoft adware antivirus When my computer stats then audio starts playing, mostly hip hop There is no programs opened. I tried killing all unknown processed, no success. I tried resetting the firewall options of the antivirus, no success. If I disconnect from internet, then it works. The antivirus is not detecting anything. Is somebody is streaming from another house? Is that possible? and making my life impossible. How can I check and stop this?

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• What is needed for 'Previous Versions' to be visible on the client OS?

  - by Zoredache

  I have servers with Shadow Copies enabled taking snapshots a couple times a day. From the server, if you look at the local devices you can see the Previous Versions being populated reliably. But from remote clients, the ability for an end-user to see the Previous Versions seems to be very hit-or-miss. For the sake of this question you can assume that all my clients are Windows 7 and the Servers are Windows Server 2008 R2. Is there an exhaustive list of everything that is required for end user to see Previous Versions? Are their any requirements for a certain level of share or filesystem permissions, other then read access? Does something need to be open on the firewall, other then what is already in-place for normal Windows networking?

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• Windows Xp, Svchost.exe connecting to different ips with remote port 445

  - by Coll911

  Im using Windows Xp professional Sp2 Whenever i start my windows, svchost.exe starts connecting to all the possible ips on lan like from 192.168.1.2 to 192.168.1.200 The local port ranges from 1000-1099 and the remote port being 445. After its done with the local ips, it starts connecting to other random ips. I tried blocking connections to the port 445 using the local security polices but it didn't work Is there any possible way i could prevent svchost from connecting to these ips without involving any firewall installed ? since my pc slows down due to the load I'd be thankful for any advices

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• Remote access and local access same hostname

  - by cpf

  Hi serverfault, I have a server in a clients network, seperated from theirs with a router/firewall, the intention is to have this server available through one hostname (example.com) My idea is to have (at least) a DNS server in the outside, to have outside (out of the clients' network) access the internal server. The problem would at that point be the internal client (PC A) My question: What would I have to do to make something like this work? Is it even possible or already done? The goal is to not have to change anything on either PC A or PC B, while both should access the same "internal server" while surfing to "example.com" Perhaps adding logic to the DNS server would work (Detect the external IP of internal client [PC A] is the same as the IP for example.com - Give the local IP as reply?) Anyhow: Thanks for helping me think on this!

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• Tool to launch a script driven by modem activity

  - by Will M

  Can anyone suggest a software tool (preferably under Windows XP or later) that would launch an application or script in response to a phone call being received on a landline phone line connected to a data modem on the same PC? or, better, in response to a sequence of touch-tones being played over such a phone line. This would allow, for example, using the telephone to manipulate firewall settings so as to create another layer of security in connection with remote internet access to that computer. I seem to recall seeing tools to do this sort of thing in the days before broadband internet access, when there was more attention to various tips and tricks for the dial-up modem, but a few attempts at Google hasn't turned anything up.

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• Ubuntu 9.10 Dowload Speed Very Slow

  - by Don

  I'm running Ubuntu 9.10 desktop and I'm new to the Linux world, so bear with me. I'm on a corporate network of 3 T1s shared across 50-60 users. I typically get about 300 KB/sec for downloads, but for whatever reason, the Linux box will start out in that range, then drop to less than 1KB/Sec sometimes. Doesn't seen to matter where I'm downloading from. Right now I'm trying to get Eclipse for PHP and it's running at 3-6KB/sec. Getting the updates for the system will also drop to very slow rates. Our IT person has set up the machine to get the same 10.0.0.x address when it starts, and moved this IP to bypass our Proxy/Firewall going out, so that shouldn't be the issue. Can anyone recommend something I can try to better diagnose the problem. Again, I'm new to the Linux world and the hardware/OS setup side in general (coming form more of a coding background). Thanks for any advice.

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• Intermittent timeout when connecting to Sql Server, what do I look for?

  - by Will

  Sql Server 2008 Standard 64bit on Windows Server 2008 R2 virtual machine hosted on a Hyper-V server. I'm getting intermittent timeouts when connecting to the server. This happens for both windows and Sql Authentication. May timeout every 2 out of 5 tries in different applications. When the connection times out, I can see (in Profiler) that no connection was made. Firewall is holey, server port is static (good ol' 1433). If I ping /t the server I get a steady connection that wavers between 1 and 2 ms. Any ideas what else to try would be appreciated, thanks.

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• virtual hosts on lighttpd can't load

  - by Jake

  Thats what I did: Added following code to lighttpd.conf $HTTP["host"] =~ "(^|\.)test\.com$" { server.document-root = "/home/test" } created /home/test Restarted Lighttpd but it doesn't load anything Google chrome Error: No data received Unable to load the webpage because the server sent no data. Here are some suggestions: Reload this webpage later. Error 324 (net::ERR_EMPTY_RESPONSE): The server closed the connection without sending any data. Firefox: The connection was reset The connection to the server was reset while the page was loading. The site could be temporarily unavailable or too busy. Try again in a few moments. If you are unable to load any pages, check your computer's network connection. If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web. can you please explain How can I fix this? Really Thanks

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• Access to local network machine

  - by Jirka Kopriva

  I have granted new setting from my domain provider. Domain with specific port is pointing on computer in local network (fixed ip) like: mydomain.com:87 -> 192.168.1.1 Local machine is running on win server 2008. Everything works fine on local network. But mydomain.com:87 is not working. Are there extra settings for win server to allow connection from outside? (Firewall is turned off while searching for working result.)

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• Windows 2008 server unaccessible without traces in the event log

  - by Rob

  I am trying to figure out why a Windows 2008 server became inaccessible in terms of RDP and access to a web application. The server was turned off and then on. Look at the event log at the time it went offline, I can't find anything. And looking at misc application logs, the system was running like normal after it went offline. It has to be said that by mistake the firewall was switched off earlier, so a lot of attempts had been done to access the SQL Server with the sa user as well as RDP login. But the attempts has been going on for days, so nothing new about that. Besides the event logs, is there anywhere else I can go to examine the cause of this? I am also in doubt whether or not a DOS attack or similar would show up in the event log. From a log for a backup application running on this server I can see that an attempt was done to access a remote IP after the server went offline, but got no connection.

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• DNS point to server on ISP and keep shared host too?

  - by Dwayne

  I know this is probably quite easy to do, but I might just have the right search sorted out... so here is the situation: We have example.com set up as a hosted server along with app1.example.com, app2.example.com and a few others. What I would like to do is set up the right zone file to also make our internal server addressable from the outside world as internalapp.example.com. This server sits behind a firewall (pfsense) and is hooked up to the world via a cable modem that is technically on DHCP from our ISP, but has had the same external IP for the past 15 months so far. What would be the best way to set this up?

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• Can't see a Windows XP computer on the network

  - by user56614

  I have two PC's connected to the same router. One is running Vista Home Premium and the other is running XP Pro. I'm trying to reach the shares of second PC from the first PC. I've enabled file sharing on the XP PC, I've disabled firewall and defender, and I can successfully ping it from the Vista PC. Both computers are set to the same workgroup "WORKGROUP". However, if I try to type "\\192.168.1.2" in Windows Explorer (192.168.1.2 being the IP address of the XP PC), I get a message: "Windows can't access \\192.168.1.2... Error code: 0x80004005 Unspecified error". And If I type "net view \\192.168.1.2" in command prompt, I get "System error 53 has occurred. The network path was not found." Am I missing something trivial?

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• Getting started with VNC

  - by Stephen

  I have subscribed to a VPS service for the purpose of running some remote applications. To do this I'm going to need a remote desktop of one sort or another. With this in mind it was suggested that I try Ubuntu. The installation that was prepared for me was Ubuntu 11.10 64 bit (Ubuntu 11.10 (GNU/Linux 2.6.18-348.4.1.el5.028stab107.1 x86_64)) From here I used apt-get install ubuntu-desktop which completed successfully. I rebooted the machine and reconnected via ssh. When I attempt to connect from TightVNC on my Windows machine I get a message about the session being actively refused. What should I do to confirm the service is running? Do I need to setup a firewall rule to allow the ports to pass through? (I am a linux newb so explicitness is appreciated)

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• what are the vulnerabilities installing openvpn client on a customer's unattended server?

  - by senorsmile

  We run Pfsense as our primary firewall. We also have OpenVPN server running on that box to allow us to remotely connect to our network. My question is: if we have a customer's mostly unattended server that we want to access remotely, what security vulnerabilities are there to installing openvpn on the customer's server as a client connecting to our network. Presumably, we would want to limit/restrict that server's access to the rest of our network. How do we lock openvpn down and are there ways to detect abnormal activity coming from an openvpn client?

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• mod_proxy failing as forward proxy in simple configuration

  - by Stabledog

  (On Mac OS X 10.6, Apache 2.2.11) Following the oft-repeated googled advice, I've set up mod_proxy on my Mac to act as a forward proxy for http requests. My httpd.conf contains this: <IfModule mod_proxy> ProxyRequests On ProxyVia On <Proxy *> Allow from all </Proxy> (Yes, I realize that's not ideal, but I'm behind a firewall trying to figure out why the thing doesn't work at all) So, when I point my browser's proxy settings to the local server (ip_address:80), here's what happens: I browse to http://www.cnn.com I see via sniffer that this is sent to Apache on the Mac Apache responds with its default home page ("It works!" is all this page says) So... Apache is not doing as expected -- it is not forwarding my browser's request out onto the Internet to cnn. Nothing in the logfile indicates an error or problem, and Apache returns a 200 header to the browser. Clearly there is some very basic configuration step I'm not understanding... but what?

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• get all ip address from subnet mask

  - by Guntis

  I have this IP list shown below. How i can calculate all ip addresses from that in Linux? Is there some tools that can calculate that for me ? I need that to check if i have not banned some cloudflare IP's. As firewall i am using shorewall and i am banning with fail2ban single IP. As i know, then i cannot detect subent mask from IP adress, right? 204.93.240.0/24 204.93.177.0/24 199.27.128.0/21 173.245.48.0/20 103.22.200.0/22 141.101.64.0/18 108.162.192.0/18 190.93.240.0/20 188.114.96.0/20

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• routing problems

  - by user174050

  I have an windows 7 laptop and I have installed openvpn 2.2x as client. The laptop has 2 ethernet cards, one of them is wireless. The wireless lan is 192.168.1.0/24 The Fix lan is 192.168.2.0/24 If I connect to the openvpn server useing the Fix lan the I can connect properly and for testing I ping to my openvpn server 10.0.0.1 that answers correctly. But if I connect to the openvpn server useing the wireless lan, I can establish the connection but pinging to the server isn´t possible. The packets goes allways lost. Why can this happen? In an other laptop where windows xp is installed and with the same lan configuratio everything works propperly. In both cases the firewall is configured to access the vnc server and the server directories useing samba. With the XP I have no problems. I will thank you for all help Ignacio

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• Is allowing remote Sql Server Management Studio safe?

  - by dave thieben

  I administer a website that runs on IIS on one box, and SQL Server 2008 Workgroup on another box. typically I remote into the DB box and run SSMS to work on the db, but I would like to be able to access the db directly with SSMS on my local box. I've seen the other questions about allowing remote access to the database, but my question is, is this safe? I'm concerned that I'm opening a hole in the firewall and potential for hack attempts. Is this just a bad idea in general?

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• Random timeout now and then

  - by KenavR

  Maybe this is a to generic question, but since we have this issue for quite a while now, I give it a shot. We have some applications which use HTTP for the connection between the client (website or fat-client) and the server. The Computer who runs this applications is in a Network behind a firewall and a proxy, the server isn't inside the same network. The problem is that every now and then the https Request times out and depending on the Client the Application "hangs" or does some other funky stuff. The problem is definitely inside our network, because if i try the applications outside our network it works fine. Can you give me a hint where i can most likely find the problem?

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• Windows Server 2003: Nat Port Forwarding Not Working

  - by jM2.me

  The setup is following: Internet (108.99.XXX.XX) <- Windows Server 2003 (10.0.0.1) <- Switch <- Office Computers (10.0.0.100-200 some static routes some manual some automatic) Windows Server has NAT installed on it and two network interfaces are configured properly. The problem is, whenever I try to forward port 80 (or any other) from office computer (lets say 10.0.0.100), it fails. Nic #1 Settings: All settings are obtained from ISP Nic #2 Settings: Set manually IP: 10.0.0.1 Mask: 255.255.255.0 Nat Server is configured to automatically assign IP addresses to private network. Settings are: IP: 10.0.0.0 Mask: 255.255.255.0 Forwarding was done in Routing and Remote Access (local) - IP Routing - NAT/Basic Firewall - Local Area Connection (right click_properties) - services and ports - Web Server HTTP - Private Address: 10.0.0.100 SO what is causing the problem of failure to forward any port from other computer inside private network?

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• Losing WLAN connections but maintaining internet connections on WIndows 7 Workgroup

  - by Di

  I have 4 computers all running Windows 7 networked in a Work group through Billion 7404vgp-m wireless router. All drivers and firmware for wireless adapters and router are up to date. Windows Firewall and Defender disabled. Disconnected ipv6. Running Nod 32 anti virus software. All have own static IP address 192.XXX.X.XXX. When I Reset the router all computers have Internet and LAN access for about 1 hour and then they will lose the LAN connection but maintain Internet connection. Resetting wireless adapters or restarting computers does nothing to fix this but resetting router will. What is causing this? How do I fix it?

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• Is it possible to connect these machines with ssh tunnels or another mechanism?

  - by frankc

  I am physically on a machine that is behind a firewall and cannot be ssh'd into. Let's call that PC. PC can connect out to two machines, one on AWS and one that is part of a vpn connection, call them A and V, respectively. A and V cannot talk to each other directly. I need to frequently move files between A and V and have been doing this by scp'ing to PC and then scp'ing from pc. Is there a better way to do this? A and V are linux but PC has cygwin.

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• Exchange over HTTP

  - by Rob

  I have recently setup a brand new install of SBS 2011 and it is working well. Exchange is running as advertised and all users are happy. Now, there are 2 users who would like to work outside of the office and require email setting up in Outlook. No problem - Exchange over HTTP. However for some reason it's not working. They can access Outlook Web Access okay, but for some reason Exchange over HTTP / HTTPS isn't working. The error message I receive in Outlook is: "The name cannot be resolved. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action." I've tried temporarily turning off the Firewall on both the server and the client but this doesn't help at all. Is there something I'm missing or is there a permission that needs enabling to allow Exchange over HTTP to work?? Many thanks

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