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• Many clients on a wireless AP for UDP broadcast packets

  - by distorteddisco

  I asked this question on StackOverflow and was directed over here, so I'd appreciate any advice. I'm deploying a smartphone application as part of a live music performance that depends on receiving UDP broadcast packets from a wireless access point. I'm guessing that between 20 and 50 clients will be connected at any one time. I'm aware that a maximum of 20 clients per access point is advised, but as the UDP broadcast packets are ground through the LAN, how would I be able to link multiple APs together? I'm looking for recommendations on a suitable AP for this. The actual data transmission rates are very low - only a few kB/s - as I'm just sending small messages to the smartphone apps, and there will be no WAN internet connection. I tried it with a few connected peers on an adhoc wireless connection without any problems, but ran into dropped packet issues on an old WRT54G running ddwrt, though it's in pretty rough shape. What's the best way to do this? I suppose I could limit concurrent wireless connections to 20 clients... but more would be nice. EDIT: I should also say that it's purely one-way communication; the smartphone application is only receiving broadcast packets, not sending anything.

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• IIS7 houndreds of connections in CLOSE_WAIT

  - by rjlopes

  I have a .Net application on my IIS7 server it was working fine until I had to move it to another server. I moved the exact same code to the new server and I noticed that after some hours the website stopped responding to remote requests but if I did remote desktop to the server it responded to the request done to localhost. If I stop the website and the application pool it started working fine again. I was able to track the problem to hundreds of requests left in CLOSE_WAIT state to the http port that are never closed (I waited a few hours and they remain the same). Any ideias?

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• Wi-Fi won't automatically connect (box in Windows configuration gets unchecked)

  - by greg88

  The checkbox that says "Use windows to configure my wireless network settings" keeps getting unchecked (Wirless Network Connection - Change advanced settings - Wireless networks tab.) How do I stop that from happening? (So the wi-fi will reconnect.) When I manually re-check the box, it automatically connects.) I have a D-Link AirPremier DWL-G550 PCI adapter. I installed the newest driver, 5.3.0.46, and that didn't solve the problem. I took the "Atheros Client Utility" (the program window says "D-Link AirPremier Client Utility" when you run it) out of the start menu, rebooted, and that didn't solve the problem. (That utility puts a signal bar similiar to the one MS Windows puts there, and it's gone now.) The D-Link client utility has an option to automatically connect to preferred networks, but it is greyed out. It is also greyed out if I install the driver and utility right off the D-Link installation CD, so the problem isn't that the utility and driver are incompatible versions. I want to use Windows to handle the connection anyway, as the D-Link utility is garbage. Windows XP SP3 w/all current updates.

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• Connections to IIS sometimes get stuck in CLOSE_WAIT state

  - by randomhuman

  Our application includes an ASP.Net web service that only needs to deal with a handful of clients. As such, the 10 incoming connection limit of Windows XP Pro is generally not a problem. However, on one particular server, connections are occasionally becoming stuck in the CLOSE_WAIT state. These connections build up over time and eventually new client connections are refused because the maximum number of connections are used up. From my googling it sounds like a failure of the webservice to properly close the connection can cause this problem, but as it works just fine on hundreds of other Windows XP pro machines I can't see it being a bug in our code. It also ran fine on the affected machine until some shenanigans on the part of the end user (I think they set about deleting duplicate files in order to reduce their disk usage, but they did not exactly come clean about it). What could the user have changed to introduce this problem? Is there any way I can force connections that are in CLOSE_WAIT to time out rather than letting them hang around? I have seen suggestions to reduce TcpTimedWaitDelay, but that only relates to the TIME_WAIT state, and changing it did not have any effect.

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• Strange Intermittent Background Sound in Windows 7

  - by NoCarrier

  Ok, this is very strange. Recently, i noticed that every 10-15 seconds, there would be this faint, annoying duh-dum sound coming out of my speakers. (hard to describe. sounds somewhat like the sound windows makes when you unplug a USB device, but not as pronounced and much quieter). I closed every app and ended as many processes as I could, but the sound persists. I look at the volume mixer and sure enough, when the sound occurs, there is a little spike in the level under "System Sounds". I haven't installed any hardware or software in the last several weeks. This started recently - completely out of the blue. Does anyone have any insight?

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• Chrome tabs showing wrong page

  - by Jeff

  I have a problem with Google Chrome where occasionally when switching to a newly created tab (usually one made from opening a link into a new tab), the wrong page shows. The correct page is functional, links and other functions are present, but I cannot see them because Chrome seems to be reading the page I want but showing another. Sometimes it is identical to the tab I just left, sometimes it shows the content of a previously closed tab. The problem sorts out when I switch to another tab and back, and then the correct page shows. This happens fairly often and is rather annoying. Some of my friends have also experienced this, and have stopped using Chrome because of it. If anybody else has seen this problem and happens to know a fix, I'd really appreciate it.

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• Notebook display not working properly

  - by jfcfar

  I have an old Acer TM4001 notebook. If the laptop is powered-off, with the lid closed, when I power it on, it generally works. Then, without touching anything, if I reboot the computer the internal display wil not work anymore. To make it working again I need to shut down the pc, close and reopen the lid and then turn it on. If I close and reopen the lid if it is not working after power the pc on, it won't work. When the screen is working, closing and opening it has no effect (the data cable seems ok). The external monitor always works as expected: If the internal display is not detected, the external will be the main (and only) display. This is not OS-related. When the screen is not working I cannot see the POST. What could be the cause for this?

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• how to write or what is the concept behind the file unlocker program

  - by Jach Many

  Recently i was trying to delete a file thinking that i had closed the program which is manipulating the file but it did not delete because the program was still running. I misunderstood that file as an unwanted file. So i used the file unlocker program to find which process is manipulating that file. That program really worked well by showing the process which was handling that file. and that file was http://download.cnet.com/Unlocker/3000-2248_4-10493998.html. What i want to know is i would like to write a program in win32 C or .net to mimic the same process. Just to find which process is handling which file. and if possible to close it. Or i want to know the concept behind that. I know this cannot be explained in a few paragraphs yet if i could get some references or external links to references then that could be nice.

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• Source File not updating Destination Files in Excel

  - by user127105

  I have one source file that holds all my input costs. I then have 30 to 40 destination files (costing sheets) that use links to data in this source file for their various formulae. I was sure when I started this system that any changes I made to the source file, including the insertion of new rows and columns was updated automatically by the destination files, such that the formula always pulled the correct input costs. Now all of a sudden if my destination files are closed and I change the structure of the source file by adding rows - the destination files go haywire? They pick up changes to their linked cells, but don't pick up changes to the source sheet that have shifted their relative positions in the sheet. Do I really need to open all 40 destination files at the same time I alter the source file structure? Further info: all the destination files are protected, and I am working on DropBox.

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• Automatically changing a power profile when a laptop (un)docks?

  - by Dan

  I'm looking for a way to automatically change what happens when I close my laptop's lid depending on if it's in its docking station or not. In an idea world, the on-close behavior would be nothing (when docked) and sleep (when un-docked), but there only seems to be options for behavior when plugged-in and when on battery (when it's plugged in but not docked, I'd like it to sleep when closed). My initial idea would be to create a new power profile with this behavior, but I can't find a way to have it switch when docked (or for the power system to take its docked status into account at all). Any idea?

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• How can I ensure an ex-administrator of Exchange doesn't still have email access somewhere?

  - by Tony T

  I work for a company in which an ex-employee had administrative access to Microsoft Exchange 2007, and I understand that at some points this person had email which was sent to other employees also forwarded on to him. Upon taking over the administration of the server, of course all of his known accounts were closed, and any of those forwarding rules were removed. However, I would like to ensure that we didn't miss anything. What would be the best way to ensure that: (1) There isn't still some sort-of email being forwarded on to him somewhere? (2) That he doesn't have some sort-of other access to an inbox or another employee's email? I am less concerned about access to the box itself as I am that there is an existing email rule somewhere that is still getting run, or that there is a distribution list that we missed, etc.

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• why can't i delete this file on my pc

  - by ooo

  i am trying to install some software and it requires removing the following file: cd %SYSTEMROOT%\assembly\GAC rename Microsoft.Office.Interop.Outlook Microsoft.Office.Interop.Outlook.Old the problem is when i do the rename it looks like its successful but it doesn't seem to actually delete Microsoft.Office.Interop.Outlook i tried to explicitally do: del Microsoft.Office.Interop.Outlook and again it looks like it works but then when i do a "dir" i still see that file. Do you have any suggestions on why this wouldn't allow me to delete this file. I have outlook closed when i am doing this so i wouldn't think outlook is locking the file.

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• Designing a persistent asynchronous TCP protocol

  - by dogglebones

  I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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• De-duplicate Firefox bookmarks

  - by Zoredache

  What methods exist to de-duplicate Firefox bookmarks. As I search Google I find that there previously was a plugin called CheckPlaces, but that no longer seems to exist. Another popular suggestion seems to be AM-DeadLink, which I tried, but it completely trashed my bookmarks. (Fortunately I had a backup first, and yes I had closed Firefox first as instructed). I was trying to move all my youtube.com bookmarks into a folder. I tried doing a search, and then dragging the bookmarks into the folder. Apparently this creates a copy, instead of moving them as I expected. So now I have 3 of everything since I had tried a couple times.

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• I overwrote a large file with a blank one on a linux server. Can I recover the existing file?

  - by user39234

  I came back to my machine, tried saving a file over ssh onto my linux server (CentOS). It failed. I wasn't interested in keeping any changes I had made so I closed my editor and reopened the file (over ssh). The save attempt wiped the file. I have made loads of changes to it since I last uploaded to revision control. Seeing as it has just wiped the file I assume the data is still there. It's just a text file (php), is there any way of recovering it?

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• Route outbound connections from local network through VPN

  - by Sharkos

  I have a server A running OpenVPN, an OpenVPN client B (a rooted Android phone as it happens) and a third party C (a laptop, tablet etc.) tethered to B. B can use the VPN to access the internet via A; C can use the tethered connection WITHOUT the VPN to access the internet via B. However, with the VPN on B active, I cannot load information from the internet on C. A appears to log similar traffic inbound and outbound when B or C attempt to load a webpage, say, but the VPN on device B reports no inbound traffic when the connection originated from C. Where should I look for packets being dropped, and what ip rules should I use to make sure they are passed back through the VPN and into the local network B <- C? (I'll obviously post whatever further information is needed.) Further info Without VPN: root@android:/ # ip route default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 With VPN: root@android:/ # ip route 0.0.0.0/1 dev tun0 scope link default via [B's External Gateway] dev rmnet0 [B's External Subnet] dev rmnet0 proto kernel scope link src [B's External IP] [B's External Gateway] dev rmnet0 scope link [External address of A] dev tun0 scope link 128.0.0.0/1 dev tun0 scope link 172.16.0.0/24 dev tun0 scope link 172.16.0.8/30 dev tun0 proto kernel scope link src 172.16.0.10 192.168.43.0/24 dev wlan0 proto kernel scope link src 192.168.43.1 192.168.168.0/24 dev tun0 scope link

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• Networking conflict - What is the most common default computer name for Windows?

  - by John

  I recently had to change the name of my computer to log onto a public wi-fi spot, because a computer with my name was already logged on. (I asked a guy there what to do after it said there was already a computer named "(omitted)" logged on.) I've never been at a wifi spot you had to log into before. I didn't even notice what the computer's name was before. My question is what are the most common default computer names. I'm curious. How often does this sort of problem happen? (For some reason my previous post was closed as off topic - so now I included the reason I'm asking. If it's still considered off topic (networking conflicts) I'll take it elsewhere, but the other forums I know of (ehow.com, answers.yahoo.com) are full of people that couldn't begin to answer a question like this.) Thanks.

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• Networking conflict - What is the most common default computer name for Windows?

  - by John

  I recently had to change the name of my computer to log onto a public wi-fi spot, because a computer with my name was already logged on. (I asked a guy there what to do after it said there was already a computer named "(omitted)" logged on.) I've never been at a wifi spot you had to log into before. I didn't even notice what the computer's name was before. My question is what are the most common default computer names. I'm curious. How often does this sort of problem happen? (For some reason my previous post was closed as off topic - so now I included the reason I'm asking. If it's still considered off topic (networking conflicts) I'll take it elsewhere, but the other forums I know of (ehow.com, answers.yahoo.com) are full of people that couldn't begin to answer a question like this.) Thanks.

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• Different subnets routing with just one layer 3 switch

  - by GustavoFSx

  Our current network looks like this: Location 1: 2 Layer 2 switches | subnet 192.168.1.0/24 | Firewall for our VPN Location 2: 1 Layer 2 switch | subnet 192.168.3.0/24 | Firewall for our VPN Location 3: 1 Layer 2 switch | subnet 192.168.5.0/24 | Firewall for our VPN We just got a direct fiber connection between location 1 and 2, we also got a new HP V1910 24G layer 3 switch. I tried to follow the instructions on this site, but I can't get it to work. I think our network should look like this: Location 1: HP Switch FIBER to L2 | subnet 192.168.1.0/24 | Firewall for our VPN Location 2: 1 Layer 2 switch | subnet 192.168.3.0/24 | FIBER to L1 Location 3: 1 Layer 2 switch | subnet 192.168.5.0/24 | Firewall for our VPN So, how can I get routing working on our location 2? It's old gateway was a firewall device on ip 192.168.3.1. I'm thinking on creating a VLAN Interface on 192.168.3.1 on the switch for the Location 2. But how will I handle that on the HP switch that has a direct fiber connection with that switch? Please help, I'm not very good with networking.

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• Cannot login as root to centos server

  - by perpetual_dream

  I used to login as :ssh root@servip with a password authentication into my centos 6 server. I am not sure if what I have done has caused this, but while trying to get over my problem of accessing webmin remotely I followed the following tutorial until I reached: adding auth required pam_google_authenticator.so into /etc/pam.d/sshd. Then by mistake, I have closed the ssh session. When I tried to login in back with the usual password, I get: Permission denied, please try again error. How can I get over this problem? I don't have a physical access to the server.

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• Unable to move or delete files

  - by Erik

  Hi: Just today I got the following error while trying to move/delete several files: The action can't be completed because the file is open in another program. The file wasn't open, but just in case, I closed all programs. When that failed to allow me to move or delete the file, I restarted the computer. When that failed to let me move/delete I came here. Any suggestions? The files can be copy/pasted but move/delete fails even after multiple restarts.

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• French accents on a PC with US keyboard??

  - by frenchie

  My laptop has a US keyboard, and I need to write some French, with accents. I know there's a painful way to do it with combinations of the alt key and the ascii code alt-codes, but I was wondering if there was an easier way to do it. PS: Since the question is closed (but the answers no great) I thought I'd add this addendum. Basically, you need to set the keyboard to US International and then you can do accents using 'e or 'a; see this link: http://support.microsoft.com/kb/97738 PS: Much much better solution: http://keyxpat.com.

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• Why can't I open programs after watching youtube videos for a while?

  - by manjivsanotsu

  I have recently built a new PC, and it worked fine for a while (1-2 months of no problems whatsoever). However in the recent weeks I noticed that after I watched some youtube videos and closed everything, I can no longer do anything except move the mouse and expand the Startup Menu. If I click on any of the programs on the Start Menu or type a program on the Run text box, it won't open anything. I can't open taskmgr, or windows explorer, or even shut down the PC. I don't have anything else running when I'm watching videos except ZoneAlarm and Avast. The only workaround I can do when this happens is a forced shutdown (holding the power button of my PC), and restart if I wanted to do anything more. But this happens a lot - about 4-5 times a week so I'm worried it would fry up my hardware if I keep on doing this. OS: Windows 7 Other Installed Software: Open Office, Tropico 4 game, Adobe Photoshop Browser used: Google Chrome Hardware: CPU: i7 2600K RAM: 16 GB Motherboard: Asus P8Z68-V GEN3 Hard Drive: 120GB Corsair Force GT SSD Graphics: 2047MB GeForce GTX 560 Ti

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• What happened to WinFS?

  - by Console

  The most interesting feature that was ever connected to what eventually became Vista was WinFS, a revolutionary (so it seemed, at least back then) new way of storing and accessing information on a computer. This feature was cut despite actually reaching a closed alpha/technical preview release. There was a smoke and mirrors blog post from MS about the technology living on in an upcoming SQL server release, but to me it just felt like it was axed, hard. Does anyone have any idea what happened to it? Is it killed, or just on the backburner? Was it just impossible to implement, too expensive, or did someone think of a better idea? Are there any projects (From MS or anyone else) that have similar goals?

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• How to make lighttpd respect X-Forwarded-Proto when constructing redirects for directories?

  - by Tim Landscheidt

  We have an nginx proxy at tools.wmflabs.org that receives requests by http and https and passes them by http on to lighttpds on a grid (one lighttpd per top-level path). Requests that reach the proxy by https are received by the lighttpds like this: HEAD /lighttpd-test/test HTTP/1.1 Connection: close Host: tools.wmflabs.org X-Forwarded-Proto: https X-Original-URI: /lighttpd-test/test User-Agent: curl/7.29.0 Accept: */* This works great except in the case where the URL references a physical directory and misses the trailing slash ("/"), as lighttpd then generates a redirect to the http URL: HTTP/1.1 301 Moved Permanently Location: http://tools.wmflabs.org/lighttpd-test/test/ Connection: close Date: Fri, 06 Jun 2014 14:50:29 GMT Server: lighttpd/1.4.28 The relevant parts of our lighttpd configurations are: server.modules = ( "mod_setenv", "mod_access", "mod_accesslog", "mod_alias", "mod_compress", "mod_redirect", "mod_rewrite", "mod_fastcgi", "mod_cgi", ) server.port = $port [...] server.document-root = "$home/public_html" [...] server.follow-symlink = "enable" [...] server.stat-cache-engine = "fam" ssl.engine = "disable" alias.url = ( "/$tool" => "$home/public_html/" ) index-file.names = ( "index.php", "index.html", "index.htm" ) dir-listing.encoding = "utf-8" server.dir-listing = "disable" url.access-deny = ( "~", ".inc" ) [...] How can I make lighttpd respect X-Forwarded-Proto and use it when constructing redirects for directories? I'm aware that I could try to tackle this in nginx, but I'd prefer if I can fix it in lighttpd.

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