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• Can TP-Link router make phone calls?

  - by Umair Ashraf

  I have a TP-Link router with DSL service provided by a local company which serves it over the landline phone. My landline cord is plugged into an ethernet router which is then plugged into TP-Link wireless router. I can access internet with this wireless router all over my home with all computers. Landline Cord [into] Ethernet Router [into] TP-Link Wireless Router [air] Computers I would add that landline cord is also into a phone device which I use to make calls and that's not cordless. Now I am accessing internet via WiFi on my laptop and want to ask if is this possible to make landline calls via this same computer I am surfing internet through? What I am asking it to a dial-up via TP-Link router that goes through landline. You see the landline cord is the actual data gateway and is also used to make calls. So it can simultaneously send Data and Voice over the same wire.

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• VPN using Zywall

  - by Rune FS

  I've played around with a certificate based VPN (normally I don't do hardware) we've manged to setup the connection and the tunnel between the routers is working correctly. We now need the last step. There's no connection to the computers on the other end. What could we have forgotten? (we're testing with two standard configured Win7 machines) EDIT: Just to clarify the tunnel is working I can ping the router on the other end. I can't access the computers on the other side of that router and vice versa. (It's also possible to access the remotemangement console of the remote router on the LAN IP)

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• Can't telnet to SQL Server

  - by Thiago

  Hi there, I have an SQL Server running on a computer, and I'm trying to access it from another computer in the same local network (potentially VPN, since it's located in a datacenter). The point is that I can't even telnet to the port in which SQL Server is listening. And yes, SQL Server is working, since I can telnet to it from my workstation. I think it's something in the host, since there's no hop between the two computers, but I don't know how to troubleshoot this. Basically I get a connection failed, when I try to telnet. What can cause such problem, since apparently there's no firewall and the server is accepting connections from other computers? Thanks in advance

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• Looking for a Software to harden Windows machines

  - by MosheH

  I'm a network administrator of a small/medium network. I'm looking for a software (Free or Not) which can harden Windows Computers (XP And Win7) for the propose of hardening standalone desktop computers (not in domain network). Note: The computers are completely isolated (standalone), so i can't use active directory group policy. moreover, there are too many restriction that i need to apply, so it is not particle to set it up manual (one by one). Basically what I’m looking for is a software that can restrict and disable access for specific user accounts on the system. For Example: User john can only open one application and nothing else -- He don’t see no icon on the desktop or start menu, except for one or two applications which i want to allow. He can't Right click on the desktop, the task-bar icons are not shown, there is no folder options, etc... User marry can open a specific application and copy data to one folder on D drive. User Dan, have access to all drives but cannot install software, and so on... So far ,I've found only the following solutions, but they all seems to miss one or more feature: Desktop restriction Software 1. Faronics WINSelect The application seems to answer most of our needs except one feature which is very important to us but seems to be missing from WINSelect, which is "restriction per profile". WINSelect only allow to set up restrictions which are applied system-wide. If I have multiple user accounts on the system and want to apply different restrictions for each user, I cant. Deskman (No Restriction per user)- Same thing, no restriction per profile. Desktop Security Rx - not relevant, No Win7 Support. The only software that I've found which is offering a restriction per profile is " 1st Security Agent ". but its GUI is very complicated and not very intuitive. It's worth to mention that I'm not looking for "Internet Kiosk software" although they share some features with the one I need. All I need is a software (like http://www.faronics.com/standard/winselect/) that is offering a way to restrict Windows user interface. So IF anybody know an Hardening software which allows to set-up user restrictions on Windows systems, It will be a big, big, big help for me! Thanks to you all

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• CPU Lockup when loading folder of bookmarks in Firefox

  - by Gary M. Mugford

  I am running Firefox 3.6 on WinXPSP3 on a duo Core machine with 4G of memory. I am also running Avast! free anti-virus and ZoneAlarm free firewall, both latest versions. Within the last month, my service provider basically forced me to upgrade to a Docsis 3.0 compliant modem (offered me a deal I couldn't turn down). At that point, I also upgraded to FF3.6. Basically, I am not unhappy with many aspects of this switchover, EXCEPT, when I now load a folder of bookmarks (anywhere from 10 to 38) I get nothing like the load times I experienced a couple of months back. It's taking minutes rather than seconds. And the first bookmark in one of the folders, GMail, rarely loads before timing out. I have used the old trick of powering off the cable modem before my day's work. This used to fix 'load-lag' in the old days. I have switched from my ISP's DNS server to Google, OpenDNS and back. And nothing seems to work currently. It's not my DNS cache. That's been flushed and secondary computers also have the same issue when loading folders. I have watched the CPU usage and loading the folder will send VSMon (ZoneAlarm) usage over 40 percent, AVastSvc (Avast!) over 30 and Firefox will then push the needle to 100. There's a brief burst by SVCHost when the others falter in devouring cycles. Then everything subsides to single digits once the last tab is loaded. The only other nominal nastiness is VSMon ALWAYS hitting 50 percent when ANY program starts downloading content from the internet. If I shutdown ZoneAlarm (and VSMon with it), the same slow loading takes place, but this time System is running 50% plus, again driving the usage to 100 per cent. I have my doubts FF3.6 vs FF3.5 is an issue, since the other computers are still running 3.5 and suffer the same issue. Those computers are on, but inactive, most of the time, being backups. Obviously, when the CPU hits 100, I can't do much of anything in FireFox OR in other programs. Video play through WMPC or VLC is extremely choppy, although it doesn't seem to affect the audio. Any ideas what I can try next? Thanks, GM

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• My computer's dying :(

  - by j-t-s

  Hi All I have a sweet computer and have never had any real problems with it until now. I recently formatted my computer and all was well. But now my monitor randomly flickers. The monitor will just go black for about a second or two, then it'll return back to its normal state with all the stuff still on the screen. This is getting progressively worse. Another problem that has started is my computer randomly restarts. (I've managed to prevent it from restarting by removing the check in Automatically Restart from the Startup and Recovery Dialog. But I know this doesn't solve the problem). It also completely freezes up on me. One last thing, this morning I got a big blue screen. I can't remember what it said, but if it happens again I will take note of it and repost. Or if I can find some kind of a log file containing that bluescreen error I will post. I have checked all cords, and they're all fine. Nothing's loose. My computer isn't overheating either. I've taken the case off for 3 whole days and haven't used the computer for those 3 days, which has had no effect. I've checked the connections inside and nothing's loose there either. I know there's nothing wrong with my monitor because my friend has 2 computers and it works perfectly on those computers. I don't understand how my computer could suddenly become so unstable. I'm almost certain that I have no viruses; I full-scan my pc everyday for nastys, and have strict firewall settings. Anyway, I don't see how it could be a virus anyway simply due to the fact that I had these problems right after I formatted, and before I even had the chance to install or copy anything or even connect to the internet. I know it has nothing to do with the way I formatted the computer too, I've been fixing computers for years. Sorry for rambling on, just making sure I don't leave anything out. Has anybody else had this problem? Can somebody please try to help me with this? Thank you :)

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• Intgrating windows 2000 server in a windows 2008 domain [on hold]

  - by user199121

  I have a network enviroment where my windows 2000 server is just acting as fileserver for sharing, so all the users has an account there with username, password and a list of access rights. Now i want to keep this server cause i am running from there an application that 20 users access but also i want to add a new Windows 2008 R2 64 bit server as a domain controller. Is this possible ? 1-It is ok to make the new windows 2008 server a domain controller ? 2- I want all the users accounts to be the same in the domain controller so they can still use the same username and password to login into the domain as well into the windows 2000 server that is setup as a Workgroup. 3- Do i need to do something to the windows 2000 sever to still be functional in the environment so it can be accessed by the clients computers? note:My clients computers are windows 2000 pro, xp pro and windows 7 32/64 bit. Thanks in advance

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• Maintaining state and data context between requests in ASP.NET + EF4

  - by Nick

  I have a EF4/ASP.NET web application that is structured to use POCOs and generic repositories, based essentially on this excellent article. The application is relatively sophisticated with one page that involves selection and linking of multiple entities to build up a complex user profile. This requires access to multiple entity types (20 or so) and associated repositories across multiple posts. When a repository is first accessed it uses the existing data context if exists, else it creates a new context. The problem is that if the lifetime of the context is only per-request (as suggested in the article) then you have to deal with multiple contexts and the complexity around detaching and attaching entities from contexts. My solution is to share the context between posts by creating a single View Model that includes all required repositories (initialised to share the same context) plus any associated data and store this model in a Session variable, retrieving from Session on subsequent page requests. Therefore maintaining the same context across all posts until the profile is saved. This works fine BUT I am concerned that I don't actually know exactly what is stored in the model session variable or more importantly the size of the Session variable. So two questions I suppose: firstly should I look for a better solution to handle the shared context across posts issue (any suggestions welcome)? And secondly what is actually stored in the Session when it includes a repository plus context? Any help appreciated!

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• Windows Server 2008 R2 DNS Server not working?

  - by wolfvilleian

  Hi, I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I try to ping it's own hostname it also does not work. However another computer that is on the domain can ping it fine, and another computer on the network but not domain can ping fine as well. The computer that cannot ping the server is setup to use the DNS server running on the server only (secondary dns points to nothing) and it will resolve the hostname of the server to the external IP not internal when the other two computers correctly resolve the internal All 3 computers and server are connected directly into the same switch. Does anyone have any ideas on how to fix this? Thanks

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• X:\ is not accessible. Insufficient system resources exist to complete the requested service. Help [

  - by Katherine

  I keeping getting the error message from above on multiple computers that I administer. I wasn't sure if I should be posting this on SuperUser or ServerFault so my apologizes if it should go there... Basically, I have at least 5 computers of varying ages (some fresh out of the box!) throwing the above error. X:\ is one of our network drives that is mapped for users. Most of the time if you shut down the biggest application it will fix the problem, but it's becoming an increasing issue, and I can't keep running around fixing it manually. I have tried to do some research, but most of it just states the obvious without supplying a permanent fix. The machines are all running Win XP SP3, with at least 2gb of ram. Sorry for the delay in getting back to people... a lot of good questions. To respond back to people... It is a windows 2003 server that houses the file share. We have about 175 users, however i cannot state how many are actually accessing the information at a single moment. Considering that this is our largest file share, I would say that probably at least 100+. The files we work with are large, but not that big considering that we do a lot of graphical and video work. ~50mb. That being said, this is error occurs simply when trying to gain access to the server itself, not actual files. When I say close a program, I mean that it can be any program. It doesn't matter which program. It varies from machine to machine, and from day to day. Some days it is Firefox, some days it is Outlook, some days it is Excel. There doesn't seem to be a common bond behind which application could be causing the problem. Thank you for the articles, and the recommendation on paging files. I will have to look into that. None of our computers are set to hibernate, so I am going to rule that out.

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• Failure to create keytab file using msktutil on Centos to W2K8

  - by user49321

  I'm trying to setup a centos 5.5 squid server to authenticate against a windows 2008 DC. I have followed the tutorial: http://serverfault.com/questions/66556/getting-squid-to-authenticate-with-kerberos-and-windows-2008-2003-7-xp However I have run into an issue. When I run the command: (Obviously changed for my enviroment) # msktutil -c -b "CN=COMPUTERS" -s HTTP/centos.dom.local -h centos.dom.local -k /etc/HTTP.keytab --computer-name centos-http --upn HTTP/centos.dom.local --server server.dom.local --verbose --enctypes 28 I get the following error (The whole message is too long to post here): Error: Unable to set machine password for centos: (3) Authentication error Error: set_password failed kinit works fine and the computer is added to the DC under COMPUTERS and SRV records created except no keytab is created.

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• How important is patch management?

  - by James Hill

  Problem I'm trying to sell the idea of organizational patch/update management and antivirus management to my superiors. Thus far, my proposition has been met with two responses: We haven't had any issues yet (I would add that we know of) We just don't think it's that big of a risk. Question Are there any resources available that can help me sell this idea? I've been told that 55-85% of all security related issues can be resolved by proper anti-virus and patch/update management but the individual that told me couldn't substantiate the claim. Can it be substantiated? Additional Information 1/5 of our computers (the ones on the building) have Windows update turned on by default and anti-virus installed. 4/5 of our computers are outside corporate and the users currently have full control over anti-virus and Windows updates (I know this is an issue, one step at a time).

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• Multicasting and multicast address

  - by Zia ur Rahman

  I have confusion about the multicast addresses, I have read an example which is given by. Suppose two applications have been built to send audio over a network. One application accepts and digitizes an audio input stream, and then sends the resulting frame across the network to other application. The second application receives the digitized audio from the network, converts it back to the audio signal and plays the result over a speaker. Unless the two applications use broadcast to send frames, no other computers on the network will receive a copy of the frame. Multicasting provides an excellent solution to the problems of allowing some computers to participate in audio transmission. To use multicasting , a multicast address must be chosen for the audio application. And the receiving application passes the multicast address to the network interface. The interface begins to accept the packets sent to that address. Question: how this multicast address is chosen, how the receiving application knows that the sender using this specific destination address for the audio frames.

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• Create a bootable Ghost CD from a HDD

  - by r0ca

  Hi all, I have a little issue and it may be quite simple to fix. I need to Ghost some computers (locally) and now, it seems to be really hard to have several computers to boot from floppy. Sometimes the floppy is not detected (Old PC) and doesn't boot from it. So I need to create a Ghost image from a HDD. I use Disk to Disk when ghosting from an IDE HDD but I'd like to change it to Disk from Image. My issue is it's a linux, IDE HDD, and I have a laptop with Windows 7. I also have a USB adaptor for IDE HDD. I'm trying to find a way to create a Bootable CD from the HDD connected on my laptop with the USB adaptor. Is it possible to do this? What would be the best way to do that?

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• Disable the Taskbar in Windows 7

  - by ToastMan

  Hi all, I got Windows Server 2008 and Windows 7. We need to run an application on certain computers with very restricted access to other windows functions. Is there a way to disable the taskbar for client users on W7 computers? I looked in the Group Policies but it's not there. Also, I am aware of Taskbar Eliminator, but it doesn't remove the Start button which is not good for me. Any suggestions are very appreciated. Thank you. Toast

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• Can I bridge two wired networks with a Netgear WG602 (v4)

  - by Mr. Flibble

  I have two networks and I want to join them. Only one has a router. The other is currently just a bunch of computers joined via a switch. So it looks a little like this: 1. Router + comp1 + comp2 + wireless ap 2. comp3 + comp4 + Netgear WG602 Is it possible to use the WG602 to connect to the WIFI of the main network (the one with the router) and connect via wire to the 2nd network - therefore allowing the computers on network 2 to use the router on network 1?

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• Why would a terminal server be kicking users off after about 5 minutes?

  - by Matt

  I have a terminal server that was restored from an old 1U server to an IBM HS20 Blade running ESXi. The restore was using shadow protect hardware independent restore. All appeared to be functioning well but we're finding that users are being periodically kicked off after around 5 minutes or so. The interesting thing is it doesn't appear to be a simple disconnect but the whole session has gone like it was logged out. There is nothing significant in the event log, and certainly nothing from terminal services that is logged. I've also checked the client computers and from the client computers logged into our other terminal server and there wasn't any issues there. It doesn't appear to be network related. Any ideas?

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• How to program critical section for reader-writer systems?

  - by Srinivas Nayak

  Hi, Lets say, I have a reader-writer system where reader and writer are concurrently running. 'a' and 'b' are two shared variables, which are related to each other, so modification to them needs to be an atomic operation. A reader-writer system can be of the following types: rr ww r-w r-ww rr-w rr-ww where [ r : single reader rr: multiple reader w : single writer ww: multiple writer ] Now, We can have a read method for a reader and a write method for a writer as follows. I have written them system type wise. rr read_method { read a; read b; } ww write_method { lock(m); write a; write b; unlock(m); } r-w r-ww rr-w rr-ww read_method { lock(m); read a; read b; unlock(m); } write_method { lock(m); write a; write b; unlock(m); } For multiple reader system, shared variable access doesn't need to be atomic. For multiple writer system, shared variable access need to be atomic, so locked with 'm'. But, for system types 3 to 6, is my read_method and write_method correct? How can I improve? Sincerely, Srinivas Nayak

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• How does Router know where to forward packet

  - by kornelijepetak

  If several computers with local addresses (192.168.0.#) are connected to a router and each computer opens a web browser and requests a page over HTTP, when these TCP:80 packets are sent out, the router switches the local address with the static IP of the router (i.e. Provider given IP) so the server can reply to the appropriate address. But how does the router know to which computer to forward the HTTP reply, since the TCP header does not contain the local IP address (does it?), and all computers are using port 80? Does this have anything to do with the MAC addresses? How exactly does this work?

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• Server hard disk read speed and client download speed, is there a connection? [closed]

  - by Mywiki Witwiki

  Ok so a client's download speed is only as fast as a server's upload speed, and vice versa. Based on the answers to this post: Does upload speed depend upon download speed of the server? In other words, the data transfer rate between the two computers is only as fast as the speed of the "bottleneck". Let's pretend the two computers are in two different networks and both have 100Mbps internet connection. Ben wants a copy of a file in Mark's computer hard disk with 30Mbps read speed. Does this mean that Ben can download the file at a speed of around 30Mbps only, despite having an internet connection faster than 30Mbps?

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• How to design a RESTful collection resource?

  - by Suresh Kumar

  I am trying to design a "collection of items" resource. I need to support the following operations: Create the collection Remove the collection Add a single item to the collection Add multiple items to the collection Remove a single item from the collection Remove multiple items from the collection This is as far as I have gone: Create collection: ==> POST /service Host: www.myserver.com Content-Type: application/xml <collection name="items"> <item href="item1"/> <item href="item2"/> <item href="item3"/> </collection> <== 201 Created Location: http://myserver.com/service/items Content-Type: application/xml ... Remove collection: ==> DELETE /service/items <== 200 OK Removing a single item from the collection: ==> DELETE /service/items/item1 <== 200 OK However, I am finding supporting the other operations a bit tricky i.e. what methods can I use to: Add single or multiple items to the collection. (PUT doesn't seem to be right here as per HTTP 1.1 RFC Remove multiple items from the collection in one transaction. (DELETE doesn't seem to right here either)

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• How do I share a complete XP disk so it can be seen from a Windows 7 system?

  - by Ian Ringrose

  This should be easier! (both computers can see the internet etc so I know the network it’s self is working) I have a normal home network with a Windows XP machine on it and the new Windows 7 (64 bit) machine. So I can transfer the files to the new Windows 7 machine, I wish to share the complete disk (and all files) from the Windows XP machine and access them from the Windows 7 machine. Is there a step by step set of instructions for doing this anywhere? So fare I have: put both computers into the same workgroup put the windows 7 machine into work network mode so it can see the XP machine in the work group shared the XP disk as read only But when I try to access a lot of the folders on the XP disks, I am told I am not allowed to access them. (I was not asked for any passwords by the windows 7 machine when I accessed the XP machine. The XP machine just has its default account with no password set on it)

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• Are there significant performance difference between chipsets?

  - by Let_Me_Be

  I wanted to build a single PC to fit all my needs, but since hardware virtualization support (Vt-d specifically) is a huge problem, I decided to build multiple single-use oriented computers. In this scenario I want these computers to be as minimal as possible. So the core of my question is: "Are there significant performance difference between chipsets?" I'm considering Sandy-Bridge i7 or i5 for my "game console" computer. And since I will use only one graphic card, one or two HDD, 4-8GB RAM and nothing else, I would be fine with a micro-ATX board with a Q67 (or some other low-end chipset).

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• Steps to make sure network is not blacklisted...Again

  - by msindle

  I have an interesting issue. I have a client that just got blacklisted due to spam being sent out over the last 2 days. I have my firewall configured to only allow mail to go outbound on port 25 from our mail server (Exchange 2010) exclusively and I have verified that there are no open relay's on our transport rules. We are running Vipre Business and after running deep scans with updated definitions all computers come back clean. I ran a message tracking report on our Exchange server that shows all mail sent via the mail server over the last couple of weeks and didn't see anything malicious or out of the ordinary. I have also verified that there are no home devices or rouge computers on the network. For all practical purposes it appears that the network is clean, but we still wound up on 5 or 6 blacklists...Where should I start looking next? Is there a "best practices" guide that can help eradicate this issue? Thanks in advance! msindle

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• Windows Server 2008 R2 DNS Server not working?

  - by wolfvilleian

  I have a server running Windows Server 2008 R2 hosting a DNS server, exchange 2010 and is a domain controller. One computer on the network (and domain) can ping the server 25% of the time, also when I try to ping it's own hostname it also does not work. However another computer that is on the domain can ping it fine, and another computer on the network but not domain can ping fine as well. The computer that cannot ping the server is setup to use the DNS server running on the server only (secondary dns points to nothing) and it will resolve the hostname of the server to the external IP not internal when the other two computers correctly resolve the internal All 3 computers and server are connected directly into the same switch. Does anyone have any ideas on how to fix this? Thanks

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