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  • Loss of wireless network connectivity when playing video via HDMI cable

    - by Jeff Fohl
    Hi Folks - New to Super User, so I hope this question fits in with the guidelines. Very strange problem I am having, and I am at a loss as to how to continue troubleshooting this one. The basic problem is that when I attempt to watch streamed video on a particular display device (an Optoma HD180 projector), my network connectivity drops like a stone to barely measurable levels. This is my setup: I have a Dell H2C 730x running Windows 7 64bit. This particular computer has two ATI Radeon HD 4800 video cards. I have two Samsung 22" monitors connected to one card, and an Optoma HD180 digital projector connected to the other card via an HDMI cable. My internet connection is normally a reliable 6Mbps. The problem I am having occurs when I stream video (or even just browse the web) on the Optoma Projector. When I do this, my internet connection drops to practically zero (just a few kilobits per second). When I move the browser away from the projector, and over to one of my Samsung monitors, the internet connection comes right back. Note that the Optoma projector is on and enabled as a third monitor all this time. I can move the mouse around on the projector without triggering the problem. I tried pinging my router when I was playing a movie on one of the monitors, and I get a 1 millisecond response. However, when I have the movie playing on the Optoma projecter, pinging the router gives me response times in the hundreds of milliseconds, or times out completely. So, it clearly is something local to my machine - and not some sort of throttling occurring down the line. I would think that it is possibly something to do with the HDMI driver conflicting somehow with my network driver (which is a USB-based wireless connection). This one has me really stumped. Anyone have any ideas? EDIT: I am now leaning towards the possibility that the HDMI cable is somehow interfering with the wireless network, when large amounts of data are being pushed through the cable. Is this possible?

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  • How to reliably keep an SSH tunnel open?

    - by Peltier
    I use an SSH tunnel from work to go around various idotic firewalls (it's ok with my boss :)). The problem is, after a while the ssh connection usually hangs, and the tunnel is broken. If I could at least monitor the tunnel automatically, I could restart the tunnel when it hangs, but I haven't even figured a way of doing that. Bonus points for the one who can tell me how to prevent my ssh connection from hanging, of course!

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  • VMware server 2.0 SYN/ACK repeating issues

    - by user65579
    VMWare Server 2.0.0 Build 122956 I am having some issues with connecting into a guest VM (Ubuntu linux 4.4.3-4 lucid) running under VMware 2.0 on a windows server host. All connections to and from the VM's work fine, except for FTP. I thought the issue was the FTP daemon at first but it has been ruled out that it is not the daemon or the server itself. When you try to connect to the FTP server from outside of the host OS it fails with a "421 Service not available" but when you try and connect from the local VM or from the host OS the connection goes through fine. I have ran many packet sniffs using wireshark/tcpdump from the VM, the host OS, and the client connecting, the most informative is the host OS. I have attached a PNG of the relavant packets that were captured. I viewed some other network traffic that was sniffed (WWW specifically) and it seems to do the same syn/ack repeating but the user doesnt see any issues. I have disabled the firewall and the issues persisits, I have tried with specific allow rules to ensure the data is allowed and no changes. It appears like VMware attempts to do the ICMP redirect and it works, but then it vmware repeats the packets sent so you get 3 syn/ack's for every one syn from the client. Also VMWare appears to be attempting to establish an FTP connection between the HOST OS and the GUEST OS, because I see the second SYN sent from the HOST OS to the GUEST to initiate a new connection, and it get the appropriate SYN/ACK followed by an ACK, but the client never sees any of this from its end. EG. syn from client syn/ack from host OS to client syn/ack from guest OS to client syn/ack from host OS to client The same thing happens when the connection reset is attempted, RST's start being sent and repeated, the server responds with a valid header to continue the FTP handshake but the RST acknowledgement is allready issued and things are closed. I am not 100% if this is a bug in VMware or possibly a VMNetwork missconfiguration. Does anyone have any thoughts on where exactly the issue could be, things to try to verify or rule out? I have linked to a picture of the relevant packets sniffed from the host OS. http://img18.imageshack.us/img18/7789/vmwareftpconnection.jpg

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  • Nginx + Passenger running a RoR app is returning 401 when 302 is expected

    - by DBruns
    I've got a RoR app running on Passenger on top of Nginx. I'm using devise for my authentication method and have a link that gets sent in an email to users that requires authentication to view. If a user clicks the link from Outlook, and IE is the default browser, IE makes an HTTP request using the following headers: GET http://www.company.com/custom_layouts/108 HTTP/1.1 Accept: */* Accept-Language: en-us User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E) Accept-Encoding: gzip, deflate Connection: Keep-Alive Host: www.company.com Returning: HTTP/1.1 401 Unauthorized Content-Type: /; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive Status: 401 X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 2.2.15 WWW-Authenticate: Basic realm="Application" Cache-Control: no-cache X-UA-Compatible: IE=Edge,chrome=1 Set-Cookie: _vxwer_session=[sessionstr]; path=/; HttpOnly X-Runtime: 0.011918 Server: nginx/0.7.67 + Phusion Passenger 2.2.15 (mod_rails/mod_rack) 31 You need to sign in or sign up before continuing. 0 When the exact same URL is typed into the address bar, it does this: GET http://www.company.com/custom_layouts/108 HTTP/1.1 Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */* Accept-Language: en-US User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; InfoPath.2; .NET4.0C; .NET4.0E) Accept-Encoding: gzip, deflate Connection: Keep-Alive Host: www.company.com Returning: HTTP/1.1 302 Found Content-Type: text/html; charset=utf-8 Transfer-Encoding: chunked Connection: keep-alive Status: 302 X-Powered-By: Phusion Passenger (mod_rails/mod_rack) 2.2.15 Location: http://www.company.com/users/sign_in Cache-Control: no-cache X-UA-Compatible: IE=Edge,chrome=1 Set-Cookie: _xswer_session=[session_info_here]; path=/; HttpOnly X-Runtime: 0.010798 Server: nginx/0.7.67 + Phusion Passenger 2.2.15 (mod_rails/mod_rack) 6f <html><body>You are being <a href="http://www.company.com/users/sign_in">redirected</a>.</body></html> 0 I expect them to return the same thing regardless.

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  • Network switching issues with MacOS 10.7?

    - by Denis
    I'm having a wired problem and hope somebody can tip me, what way should I dig to. I'm using MacBookPro with Lion 10.7.3 both at my working place & at home. At working place, we have a domain-based network with 802.1x authorization (more than 400 computers) and to connect it I'm using Ethernet cable. IP range is 10.10.2.*. All network settings are setup automatically by DHCP. Also, in settings, I have Network Account Server setup in the User&Groups Settings for my work Domain server - and it is available only from corporate network. At home, I have an ADSL router, that shares Internet connection by WiFi in NAT mode. I'm using WiFi to connect it. Router gives out addresses from 192.168.1.* range and all settings are also set up by router's DHCP. So, my problem is the following. When I come back home from the office, I open my MacBook and AirPort automatically connects my WiFi network. After this, for about 1 minute I'm able to browse sites & ping hosts successfully. But after this minute, network connection is broken down. All pings return time-out. trace route to google.com stops on 192.168.1.1 (which is my router). This lasts for 3-4 minutes. After that network connection is automatically repaired and all pings go smoothly again. At the same time, when my MacBook return timeouts, I can successfully ping any host from my wife's MacBook - so this doesn't look like router issue. When I come to the office, I don't have any issues and Internet connection is available & stable moments after ethernet cable plugged in. Do anybody has any clues about this? What should I monitor & what settings look for resolving this issue? Please, ask, what additional information should I provide. Hoping for good advice & thanks in advance!

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  • How can I make my other computer run a program?

    - by TimothyAWiseman
    If I have two computers, both running Windows 7, on my home network, is there some way to write a script so that I can click on a single icon on the one computer and make the other computer execute a program? Clearly, I could do this by accessing the other computer through remote desktop connection and then executing the program, but I would like to avoid (or at least automate) making the connection so I can just click a single icon to have it happen.

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  • Create VPN between windows and sonic wall

    - by Chris Lively
    I'm trying to establish a VPN connection between our Windows 2008 R2 server and a client's SonicWall device. The problem is, I'm not entirely sure where to start. I thought I could just add it to RRAS but this doesn't appear to work (times out), I'm not entirely sure I did that right anyway. My server is hosted on an EC2 instance if that matters. My question then is how should I go about establishing this type of connection?

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  • Why does net rpc shutdown fail with the right credentials?

    - by brice
    The command $ net rpc SHUTDOWN -f -I xxx.xxx.xxx.xxx -U uname%psswd Fails with the following errors: Could not connect to server xxx.xxx.xxx.xxx The username or password was not correct. Connection failed: NT_STATUS_LOGON_FAILURE Could not connect to server xxx.xxx.xxx.xxx The username or password was not correct. Connection failed: NT_STATUS_LOGON_FAILURE When the credentials are definitely, absolutely correct. Whats going on?

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  • How do I connect to my InterBase db on a Windows Server from Delphi XE?

    - by chris
    I have installed InterBase on a Windows Server 2008, added a database through IBConsole and I'm trying to set up a connection to it from Delphi XE. I've clicked on the DataExplorer tab and right clicked "INTERBASE/Add New Connection". This is where I am having trouble setting it up correctly. Anyone know this stuff? I'm waaaay out of my comfort zone here but I'm helping some people out and I'm trying to get this to work myself so that I hopefully can fix the problems they are having.

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  • Update Windows XP to SP3 without internet

    - by Alexander
    I've been asked to update some computers running Windows XP (without any service packs) to Windows XP SP3. The computers don't have an internet connection (only a small intranet) and have never been updated since first install. Do I need to install SP1a first, then SP2, then SP3, or can I install SP3 immediately? And where do I find the right files, that don't require an internet connection during installation? All help is welcome. Thanks!

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  • Cant see my wireless internal card on BackTrack 5

    - by Tomer
    I have BackTrack 5 R3 installed on VMware and its on bridged connection so it gets its own ip on my network and it works I get internet connection but there is no ethernet cable connected yet somehow when I do iwconfig I cant see wlan0 and no other wireless card but etho is connected to the network somehow.... cant it be that eth0 is my wireless card which somehow misconfigured? Its an intel centrino advanced n 6205

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  • Sharing public key with ssh

    - by jtnire
    Hi Everyone, Is it possible to somehow setup an ssh server that doesn't require a username,password or cert to login? If that's not possible, if I were to give all customers the same public key, would each connection be encrypted individually? (i.e. user A coudn't decrypt the payload of user B's connection) I wish to provide access to a single program, which will prompt for a username and password. Encryption is essential though, and users must not be able to snoop in on each other Thanks

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  • Something is preventing incoming connections in Windows XP

    - by VarunDotCuDotCc
    I want to test Apache Server on my PC. When I visit my site from my PC at 127.0.0.1 or by typing my IP, it works. But when I try viewing my site from another PC by typing my IP, the site didn't load. I only see some data transfer activity on the PC on which the site is hosted. Note, I have tried installing different server software, disabling firewall and creating a connection as incoming connection, but nothing works.

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  • ip route add HOMEIP via SERVERIP disconnects me from ssh

    - by Arya
    I want to use a vpn connection on my Debian server but I get disconnected from ssh if I connect to the vpn. I thought by using the "ip route add" I can prevent getting disconnected from my server and it will continue to use the main connection for communication between my computer and the server, and the vpn for communication with other ips. This is the command I use ip route add PUBLICHOMEIP via PUBLICSERVERIP But I get disconnected after the "ip route add" command too. Am I making a mistake anywhere?

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  • Architectural advice - web camera remote access

    - by Alan Hollis
    I'm looking for architectural advice. I have a client who I've built a website for which essentially allows users to view their web cameras remotely. The current flow of data is as follows: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Ftp connection is enabled for the cameras ftp user. Web camera opens ftp connection to server. Web camera begins taking photos. Web camera sends photo to ftp server. On image url request: Server reads latest image on hard drive uploaded via ftp for camera. Server deleted any older images from the server. This is working okay at the moment for a small amount of users/cameras ( about 10 users and around the same amount of cameras), but we're starting to worrying about the scalability of this approach. My original plan was instead of having the files read from the server, the web server would open up an ftp connection to the web server and read the latest images directly from there meaning we should have been able to scale horizontally fairly easily. But ftp connection establishment times were too slow ( mainly due to the fact that PHP out of the ox is unable to persist ftp connections ) and so we abandoned this approach and went straight for reading from the hard drive. The firmware provider for the cameras state they're able to build a http client which instead of using ftp to upload the image could post the image to a web server. This seems plausible enough to me, but I'm looking for some architectural advice. My current thought is a simple Nginx/PHP/Redis stack. Web camera issues post requests of latest image to Nginx/PHP and the latest image for that camera is stored in Redis. The clients can then pull the latest image from Redis which should be extremely quick as the images will always be stored in memory. The data flow would then become: User opens page to view web camera image. Javascript script polls url on server ( appended with unique timestamp ) every 1000ms Camera is sent an http request to start posting images to a provided url Web camera begins taking photos. Web camera sends post requests to server as fast as it can On image url request: Server reads latest image from redis Server tells redis to delete later image My questions are: Are there any greater overheads of transferring images via HTTP instead of FTP? Is there a simple way to calculate how many potential cameras we could have streaming at once? Is there any way to prevent potentially DOS'ing our own servers due to web camera requests? Is Redis a good solution to this problem? Should I abandon PHP/Ngix combination and go for something else? Is this proposed solution actually any good? Will adding HTTPs to the mix cause posting the image to become too slow? Thanks in advance Alan

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  • Windows 7 keeps asking for WIFI credentials

    - by RubenGeert
    If I want to log onto our WIFI network, Windows keeps asking for credentials. After many connection attempts (and sometimes some reboots) we finally manage to connect. Then the connection usually stays intact for the rest of the day. But it sometimes takes 15-20 minutes before we're online... Needless to say we're using a single username/password for all failing/succeeding attempts. Does anybody recognize these symptoms? How to troubleshoot this?

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  • What's the extra FTP port here?

    - by warl0ck
    While downloading a tar ball from gnu's FTP server, I found that other than standard 21 TCP port connection, I also seeing an extra connection: tcp 0 0 192.168.1.109:45056 208.118.235.20:21 ESTABLISHED 10956/wget tcp 0 0 192.168.1.109:56724 208.118.235.20:22259 ESTABLISHED 10956/wget What that port is used for? I checked /etc/services, only 20 and 21 should be in use, am I wrong? The command in use was wget 'ftp://ftp.gnu.org/gnu/tar/tar-1.26.tar.xz'

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  • Streaming a large file

    - by Rich
    quick question say i wanted to download a file of considerable size 10gb say and i sent the GET request to a web server to download that file question is, if the client stopped reading the TCP connection, would the entire file still be downloaded, or does it depend on the client sending back an ack or something to the circuit asking for the next packet hope that makes sense This question was originally asked involving the Tor network, but i just want to know how a standard internet connection would handle this Thanks

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  • EasyVPN client Access mutiple subnet behind cisco 5510

    - by zatrac
    I need help with the following scenario Main network ASA 5510 (one inside 192.168.10.1 connection and one outside connection). This ASA 5510 connect to switch 3570 with 3 VLANS configured (192.168.10.0, 10.10.11.0, 10.10.12.0). On the remote site I have ASA5505 ( 10.10.13.0) connected to this ASA5510 through EZVPN, but all it can see is the 192.168.10.0 subnet. What do I need to do to get the subnet 10.10.13.0 to see all 3 internal subnets.

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  • OpenVPN Chaining

    - by noderunner
    I'm trying to set up an OpenVPN "chain", similar to what is described here. I have two separate networks, A and B. Each network has an OpenVPN server using a standard "road warrior" or "client/server" approach. A client can connect to either one for access to the hosts/services on that respective network. But server A and B are also connected to each other. The servers on each network have a "site-to-site" connection between the two. What I'm trying to accomplish, is the ability to connect to network A as a client, and then make connections with hosts on network B. I'm using tun/routing for all of the VPN connections. The "chain" looks something like this: [Client] --- [Server A] --- [Server A] --- [Server B] --- [Server B] --- [Host B] (tun0) (tun0) (tun1) (tun0) (eth0) (eth0) The whole idea is that server A should route traffic destined to network B through the "site-to-site" VPN set up on tun1 when a client from tun0 tries to connect. I did this simply by setting up two connection profiles on server A. One profile is a standard server config running on tun0, defining a virtual client network, IP address pool, pushing routes, etc. The other is a client connection to Server B running on tun1. With ip_forwarding enabled, I then simply added a "push route" to the clients advertising a route to network B. On server A, this seems to work when I look at tcpdump output. If I connect as a client, and then ping a host on network B, I can see the traffic getting passed from tun0 to tun1 on Server A: tcpdump -nSi tun1 icmp The weird thing is that I don't see Server B receiving that traffic through the tunnel. It's as if Server A is sending it through the site-to-site connection like it should, but server B is completely ignoring it. When I look for the traffic on Server B, it simply isn't there. A ping from Server A -- Host B works fine. But a ping from a client connected to Server A to host B does not. I'm wondering if Server B is ignoring the traffic because the source IP does not match the client IP pool that it hands out to clients? Does anyone know if I need to do something on Server B in order for it to see the traffic? This is a complicated problem to explain, so thanks if you stuck with me this far.

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  • How to configure Java Network Proxy Settings for domain computers

    - by adminParsed
    I need to set the Network Proxy Settings to Direct Connection, for computers on our domain. I have looked at the unattended setup configurations, as well as the deployment.properties file, and didn't see an option to set it to Direct Connection. Are there any alternate means to set this? ex...logon script, vbscript, powershell, GPO, (would be great, but I couldn't find anything on this) Thanks

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