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• homegroup administrator user no longer exists

  - by Beninja

  I had a PC with windows 7 that was the homegroup administrator for my network. I recently upgraded to windows 8 I went to homegroup in control panel and saw that the original homegroup was never removed. It says to talk to the administrator on and obtain the password to join the homegroup. I need to create a new homegroup but I cant unless I somehow remove the old one. And I cant do that because the user that had rights to the old one no longer exists. Please help!! Ben

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• Snow Leopard takes a long time to connect to Windows/Samba server

  - by hood

  We run a very heterogeneous network here: There is some XP, Vista, 7, Leopard, Snow Leopard clients, and Windows 2003 (one remaining legacy app), 2008, and Linux servers. The main file server runs Ubuntu Linux and has been added to the Windows Domain and has been used for many years; SBS 2008 is the PDC (the 2003 and 2008 are on the domain also). In Leopard there were no problems at all authenticating to the file servers. We've upgraded one of the Leopard iMacs to Snow Leopard, though the same problem occurs in a new MBP which came with the newer OS as well as a clean install on another iMac. It does not matter whether connected through wired or wireless. In the Finder when clicking on the server - whether on first boot or after it is connected - it will display "Connecting..." for up to a few minutes before either generally working (if username/password in keychain) or displaying "Connection Failed" - at which time clicking "Connect As" and typing in the username/password will take some more time and eventually work. Sometimes it will display "Connecting..." indefinitely. (I've left it as long as 15 minutes before trying something else) Accessing shares on the the 2003 and SBS servers have the problem (so I don't think it's a Samba server issue). The Server 2008 Standard is connecting instantly at the moment. Accessing the share through an alias/stacks doesn't have this problem. Leopard and Windows clients still have no problem. I've searched Google but hasn't yielded any working result. How do I get rid of this delay?

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• Security for university research lab systems

  - by ank

  Being responsible for security in a university computer science department is no fun at all. And I explain: It is often the case that I get a request for installation of new hw systems or software systems that are really so experimental that I would not dare put them even in the DMZ. If I can avoid it and force an installation in a restricted inside VLAN that is fine but occasionally I get requests that need access to the outside world. And actually it makes sense to have such systems have access to the world for testing purposes. Here is the latest request: A newly developed system that uses SIP is in the final stages of development. This system will enable communication with outside users (that is its purpose and the research proposal), actually hospital patients not so well aware of technology. So it makes sense to open it to the rest of the world. What I am looking for is anyone who has experience with dealing with such highly experimental systems that need wide outside network access. How do you secure the rest of the network and systems from this security nightmare without hindering research? Is placement in the DMZ enough? Any extra precautions? Any other options, methodologies?

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• SCM8014 to FVS338

  - by Jack

  I have a SMC8014 Router/Modem that Comcast provided me with their business class service. It was not filtering malicious traffic as aggressively as I had hoped, so I purchased a NetGear ProSafe FVS338, and put this behind the SMC8014, and all my machines behind that. After some brief configuration, all machines can see out to the internet. I also have a single web server, and I have not been able to configure things so that incoming requests can reach it. This is where I need help! I would like to have the FVS339 do NAT, so that I can assign a 192.168 address to my webserver. I've tried everything I know of, and I can't get things going. I set the SMC8014 to have a LAN facing IP of 10.0.0.1, and I assigned the FVS339 a WAN facing IP of 10.0.0.2. I would like to be able to tell the SMC8014 to just forward all traffic to 10.0.0.2, but I haven't had any success. In my (unfortunately limited) understanding, what I probably want here is a static route, but I don't know how to cofigure one, or if this is really what I want. The SMC8014 wants a Destination IP, a Subnet Mask and a Gateway IP. Any help would be appreciated.

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• How to route to a secondary interface on the same physical ethernet?

  - by sjose3612611

  INTERNET<->(wan)BRIDGED_DEVICE(lan)<->ETH_ROUTER<->LAN Problem: Need to access web server on BRIDGED_DEVICE's LAN from INTERNET via ROUTER (BRIDGED_DEVICE's web server cannot be accessed form INTERNET since it has no Public management IP). Cannot configure bridged device. It has a static IP on its LAN to which its web server binds. Attempt: Create a secondary/alias WAN Interface on ETH_ROUTER (e.g Primary: eth0.1 (for internet access) and Secondary: eth0.2 (for accessing web server on BRIDGED_DEVICE), (No VLANs). eth0.1 has a public IP; eth0.2 has a static private IP in the BRIDGED_DEVICE's subnet (e.g 10.0.X.Y). Iptables on ETH_ROUTER: Added a port forward (DNAT) from eth0.1 to eth0.2: iptables -t nat -I PREROUTING -i eth0.1 -p tcp --dport 80 -j DNAT --to-destination 10.0.X.Y iptables -t nat -I POSTROUTING -o eth0.2 -s 10.0.X.0/24 -j MASQUERADE Stateful firewall w/ overall drop policy on FORWARD chain, hence: iptables -I FORWARD -i eth0.1 -d 10.0.X.Y -p tcp --dport 80 -j ACCEPT Can ping from ETH_ROUTER to BRIDGED_DEVICE but unable to reach the web server from Internet. I see packet cont increasing for the DNAT rule but not sure where it disappears in the ETH_ROUTER after that. ETH_ROUTER is the only device that can be configured to achieve this. If familiar with this scenario, please suggest what I may be missing or doing wrong here or suggest techniques to debug?

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• Bradford Dissolvable Agent not completing scan, application unexpectedly stops without error or report

  - by MChandler

  I've been trying to connect to a network that uses the dissolvable agent to scan and OK your computer. The scan gets to around 70% ish, I think the last notification is that it's searching for AVG then closes, without report or notification. I've tried running it in compatibility modes, checking registry, running CCleaner, running as administrator, creating another user account and disconnecting all other HDD's appart from my system drive. I'm running Windows 7 64 bit, and before I joined the network bradford ran fine and gave me the all okay.

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• internet connection drops randomly

  - by Remus Rigo

  hi all I have 3 PC's at home (with Win XP, Win 7 & Win 7) and a router. I am always connected to the internet through the router (PPoE connection). My problem is that sometimes when I want to search or open a page, my browser tells me that the server cannot be reached, as if I don't have a connection to the internet. Other times it logs me out from messenger, but browsing still works. FTP download/upload also works. If i disable and enable the LAN then all works fine. The connection doesn't always drop on all three PC's at the same time. Anyone got any idea besides re-installing OS? thanks

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• Ip doesn't change when switching networks, although automatic ip is set. Cause of the issue known

  - by Julio Acevedo

  I have two routers at my house. Both of them have DCHP server enabled. One of them is 192.168.1.1 and gives adresses from 192.168.1.2 to 192.168.1.32 The other one is 192.168.1.50 and gives adresses from 192.168.1.51 to 192.168.1.99 The problem is that I only have internet access in one because my ip is 192.168.1.7, and when I switch to the other one, the ip remains 192.168.1.7, even though I have automatically get a ip adress in Ipv4. When I manually change my ip to one in the range allowed by the router, I can browse the internet. Any ideas how to solve this? Thank you.

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• How do I decrypt WPA2 encrypted packets using Wireshark?

  - by Rox

  I am trying to decrypt my WLAN data with Wireshark. I have already read and tried eveything on this page but without any success (well, I tried the example dump on that page and succeeded, but I fail with my own packets). I caught the four-way handshake from another client connecting to the network. My network info is as follows: SSID: test Passphrase: mypass The above info would give this preshared key: 58af7d7ce2e11faeab2278a5ef45de4944385f319b52a5b2d82389faedd3f9bf In Wireshark in the Preferences--IEEE 802.11 I have set this line as Key 1: wpa-psk:58af7d7ce2e11faeab2278a5ef45de4944385f319b52a5b2d82389faedd3f9bf I have tried the different options of "Ignore the protection bit" but none works. What could I have missed?

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• Can't access an internal IIS web site via IP address, only hostname

  - by chris-untrod-com

  I have a machine on my home network running Windows Server 2008 (IIS7) with a web application running under default website called HTCOMNET. The network is just on a Windows Workgroup. The server is named nas1 and has a (dynamically assigned) IPv4 address of 192.168.2.12. I can ping 192.168.2.12. When I ping the machine by name ("nas1"), the hostname resolves to an IPv6 link-local address (as opposed to the ipv4 address). In a browser, I can go to http://nas1/HTCOMNET/ and IIS serves the site, no problem. But if I go to http://192.168.2.12/HTCOMNET, no dice. I have all the windows firewalls turned off. Any idea what's going on? I can't for the life of me figure out why I can't hit IIS via the IP. I feel like it's something really obvious, but i can't figure out what. Thanks!

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• Display wireless channels currently in use

  - by DrStalker

  Is there any windows utility to display the wireless channels are currently in use by the available wireless networks? I'd like to be able to see what existing channels are using so I can try to minimize interference on a new access point without a lot of trial and error.

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• Multiple Set Peer for VPN Failover

  - by Kyle Brandt

  I will have two Cisco routers at Location A serving the same internal networks, and one router in location B. Currently, I have one router in each location with a IPSec site-to-site tunnel connecting them. It looks something like: Location A: crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location B set peer 12.12.12.12 set transform-set ESP-3DES-SHA match address internal-ips Location B: crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location A set peer 11.11.11.11 set transform-set ESP-3DES-SHA match address internal-ips Can I achieve fail over by simply adding another set peer at location B?: Location A (New secondary Router, configuration on previous router stays the same): crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location B set peer 12.12.12.12 set transform-set ESP-3DES-SHA match address internal-ips Location B (Configuration Changed): crypto map crypto-map-1 1 ipsec-isakmp description Tunnel to Location A set peer 11.11.11.11 ! 11.11.11.100 is the ip of the new second router at location A set peer 11.11.11.100 set transform-set ESP-3DES-SHA match address internal-ips Cisco Says: For crypto map entries created with the crypto map map-name seq-num ipsec-isakmp command, you can specify multiple peers by repeating this command. The peer that packets are actually sent to is determined by the last peer that the router heard from (received either traffic or a negotiation request from) for a given data flow. If the attempt fails with the first peer, Internet Key Exchange (IKE) tries the next peer on the crypto map list. But I don't fully understand that in the context of a failover scenerio (One of the routers as Location A blowing up).

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• Why is Wifi data transfer is slow?

  - by Ali Azam Rana

  I have a wifi router which was attached with my modem, and the pc was connected to the wifi router through an ethernet cable. Yesterday I moved my modem and router to another room and connected my PC with wifi through an external wifi usb dongle (tp-link tl-w722n). I noticed that the file transfer speed from my cell to PC via wifi is greatly affected. I am not clear why is this happening because although PC is now connected through wifi but the dongle supports more than 54Mbps which is still enough.

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• Is possible to boot on PXE over a WiFi device?

  - by Diogo Rocha

  As I know it is possible to boot up some bootable images (like Linux, Clonezilla, management applications and others) over a PXE (Preboot Execution Environment) server with an Ethernet device (802.3). Can the same thing be done with an Ethernet WiFi (802.11) device? I tested with my notebook but my BIOS appears to not enable booting from WiFi devices. Is it possible with some specific WiFi cards and/or a specific BIOS?

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• Windows 7 x64 wired connection problem. IP, gateway, dns assigned, can't ping. Network detected as "Network"

  - by Emil Lerch

  I am having a problem connecting to a specific wired network with my Latitude E6410 laptop. Other wired networks seem to work fine, but this one does not. I have a coworker with me with the same Intel 82577LM Gigabit Network card, and he can connect just fine. I've updated to the latest Intel drivers (11.8.75.0) and am not using Pro Set. I obtain all DHCP information just fine (IP, netmask, DNS server, default gateway). I cannot ping anything (internal or on the Internet - I tried pinging Google's public DNS servers by IP 8.8.8.8), nor can I get answers to any DNS queries through NS Lookup. Windows troubleshooting says everything is fine, but I can't get DNS responses. I've seen issues like this in the past that were related to link speed/duplex autonegotiaion failures, so I've tried manually setting link speed/duplex to all values one by one with no success. My coworker is using all default settings, so he is just using autonegotiate. Any ideas of other things to try?

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• How to detect/list rogue computers connected to a WIFI network without access to the Wifi Router interface?

  - by JJarava

  This is what I believe to be an interesting challenge :) A relative (that leaves a bit too far to go there in person) is complaining that their WIFI/Internet network performance has gone down abysmally lately. She'd like to know if some of the neighbors are using her wifi network to access the internet but she's not too technically savvy. I know that the best way to prevent issues would be to change the Router password, but it's a bit of a PITA having to re-configure all wifi devices... and if the uninvited guest broke the password once, they can do it again... Her wifi router/internet connection is provided by the telco, and remotely managed so she can log-on to their telco account's page and remotely change the router's Wifi password, but doesn't have access to the router status page/config/etc unless she opts out of the telco's remote support and mainteinance service... So, how could she check if there are guests in the wifi with this restrictions and in the most "point and click way"? In this case I'd probably use nmap to look for other devices in the network, but I'm not sure if that's the easiest way to do it. I'm not a wifi expert, so I don't know if there are any wifi-scanning utils that can tell us who's talking to the router... Lastly, she's a Windows user as I guess that'll influence the choice of tools available Any suggestions more than welcome Regards!

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• Avoid corporate blocked URL's when on Cisco VPN

  - by Marcus

  When I'm on my home PC and on my company VPN I can't get to sites that my company blocks. Is there a way to get around this? Why do my requests to facebook.com go through the VPN? Can you configure your system to, for instance, not go through the VPN for HTTP traffic? Update: We are using Cisco VPN v 5, I'm running on XP

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• How to install Windows 7 From Network?

  - by George

  Hello SuperUser My question is that is it possible to install Windows 7 (Current RTM Version) on a computer without using removable media like DVD or USB. First thing that comes to my mind is network but i dont have experience of doing Fresh Install of Windows 7 via Network. How to install Windows 7 via network without any removable media? P.S. I know some may think that doing so, is just a waste of time and it's easier to do it with removable media, but in current situation the target PC neather has CD/DVD Drive nor supports booting from USB. And in addition to that, Target computer is connected to Network via Wireless Network (Dunno if it will make any problem with installation).

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• Ping server NETBIOS name returns wrong IP and "Destination host unreachable"

  - by music2myear

  Problem server is Windows 2008 R2 VM running on VMWare ESXi 4 host. Single network adapter manually assigned single IP address (192.168.1.11). When I ping the server from any other network computer, it returns 192.168.1.124 and "Destination host unreachable". Yesterday I found a second network adapter assigned to this server with an IP of 169.254... indicating it had no real valid IP. Using the MAC addresses I determined which adapter was not needed/not wanted, and removed it using VMWare systems. This is the network Printer Server and, understandably, nothing is printing right now. I've looked at the solutions here Why was my ping answered by a different IP address than the one pinged? and they aren't applicable to my situation for the following reasons: Output of arp -a on another computer returns the correct IP address (.1.11) assigned to the correct MAC address, the incorrect IP .1.124 is not listed, and the MAC of the network adapter I removed yesterday is not listed at all. I checked out the Microsoft KB article which listed pretty much my exact symptoms ( http://support.microsoft.com/kb/981953 ) and it says to check binding orders and look for hidden adapters. But there are no hidden adapters, and there is only one Network Adapter listed in the Binding Order list. Essentially, I can communicate from the server TO any other network device, but I cannot communicate from any other network device TO the server. Help! UPDATE: Solution found, see this solution for the details.

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• Is there a driver for a hub?

  - by Nrew

  Is there a driver for a hub/switch? So that I can control the flow of data from the other computer that currently uses bandwidth, so that I could get higher bandwidth.

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• Sharing a printer over the net from Windows 7 to Windows Server 2003

  - by Grant Unwin

  Hi, I need to share a printer that is connected to a Windows 7 computer. The windows 7 computer is in another building about an hours drive away. The computer that needs to access the printer is running Windows Server 2008. Ive tried setting the printer as 'shared' for 'everyone' on the Windows 7 PC and accessing it from the server by adding a TCP/IP port to the IP address but the printer just wont add. From googling aparently it may need setting up as a printer server through IIS, but i'm just not sure on the best practice. Any help greatly appreciated. Thanks Grant Unwin

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• Separating two networks

  - by Farhan Ali

  I have two routers, R1 and R2. R1 (a stock linksys router running dd-wrt) is connected to internet and is serving internet to a network of 5 devices/PCs running a DHCP server, with a network of 192.168.1.0/24. R1 also serves internet services to R2. R2 (a ubuntu server 12.04) gets internet from R1. R2 has 3 PCs attached to it, runs a DHCP server with a network of 172.22.22.0/24. My requirement is that the clients on both sides should not talk to each other at all – with the exception that R1 clients may access the R2 router through its IP of 192.168.1.x. At the moment, R2 clients are able to ping R1 clients, which is unacceptable, whereas R1 clients cannot ping R2 clients, which is OK. I believe iptables could be set up but I don't know how.

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• utorrent does not work with proxy server

  - by developer

  I have utorrent 3.2.2(build 28500) 32-bit. I am trying to download torrent using a proxy server but nothing is working. It shows that you have a wrong network configuration. But the same server settings is working for Google chrome and Internet Download Manager. How to do it ? Also one questions: Any way to convert torrent to direct download other than zbigz.com, torrific.com and torcache.com ( i tried them, not working)?

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• Is PLC speed affected by mixing different devices?

  - by CFP

  Hello everyone! At home, I have 4 PLC devices for my home network. Two of them are 85Mb/s powerlan PLC adapters, while the others are 10Mbps powerlan PLC adapters. I have not been able to determine reliably whether the presence of the 10Mb/s ones impact on the speed of the 85Mb/s ones. Is it possible that the bitrate is limited by the slowest devices on the network? Thanks!

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• windows Home Server backup error

  - by domen

  I've finally built my WHS, but some other problems have showed up. I've googled, binged and searched SU with no success. The problem is following: at the moment I've got a Win7 laptop and Win7 PC, which should be backed up by the WHS. Laptop is backed up just fine with no issues, but when I try to manually backup the PC, after "backup is starting" message, when backup service should be monitoring changes on partitions, PC gets disconnected from the home network and thus, the backup process is stuck. Disabling/enabling network adapter gets PC back on the network. The only thing I've tried was reinstalling connector software. no success. Also, I've downloaded connector troubleshooter and only thing it says is "DHCP server was not found". I'm not good with networks, so I couldn't figure out what could that indicate (all computers in the network are assigned static IPs). Any ideas what the problem can be? I can provide any additional information, I'm just not sure what may be helpful right now. Thanks.

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