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What is the simplest way to confirm or to disprove that Virtual Box virtual machines support GRE protocol

- by mbaitoff

It is stated in VirtualBox manual (chapter 6) that VM network interfaces in "NAT" mode do not support GRE protocol. I'm currently trying to setup a pair of VMs as pptp server and client which would communicate via VM's network interfaces in "INTERNAL NETWORK" mode. I set up modern Linux OSes with pptp software on both machines and made some basic pptp configuration. However, I fail to connect the client to the server - server reports a failure when writing to GRE socket. I now need a quick proof of principal ability to use the GRE protocol between VirtualBox VMs over a network in "INTERNAL" mode, such as a several-line .c program that would try to open/send/receive/close a GRE protocol connection, or like a specific lightweight tool to diagnose the GRE availability. Any suggestions?

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Is a 302 redirect to a random URL from the homepage an SEO problem?

- by CookieMonster

I originally posted this on Stackoverflow, but I believe here is a better place to ask. My web application is very similar to notepad.cc which redirects to a randomly generated URL upon access, e.g. http://myapp.com/roTr94h4Gd. (Please note that notepad.cc is not my site.) Probably because of this redirect feature, when I do "fetch as Google" or "fetch as Bingbot", I get a 302 and no html content. Not even a <html></html> tag. HTTP/1.1 302 Moved Temporarily Server: nginx/1.4.1 Date: Tue, 01 Oct 2013 04:37:37 GMT Content-Type: text/html Transfer-Encoding: chunked Connection: keep-alive X-Powered-By: PHP/5.4.17-1~dotdeb.1 Set-Cookie: PHPSESSID=vp99q5e5t5810e3bnnnvi6sfo2; expires=Thu, 03-Oct-2013 04:37:37 GMT; path=/ Expires: Thu, 19 Nov 1981 08:52:00 GMT Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0 Pragma: no-cache Location: /roTr94h4Gd How should I avoid 302 in this case? I suppose I could modify my site to prevent the redirect, but it is a necessary feature of my web app to generate a random URL on each access. I added <meta name="fragment" content="!"> tag into my index page and set it to return a static snapshot of my page when the flag is set. But this still returns a 302. I also added a header to return 200 before redirecting, but this had no effect, either. Could someone tell me a good suggestion to solve this problem?

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Windows 7: Server disappearing from Network window

- by David Veeneman

I am running a small (three computer) network on a Windows Server 2003 domain. All of the computers were just upgraded to Windows 7. Since the upgrade, the icon for the domain server periodically disappears from the Network window on all three computers. It doesn't happen at the same time on all computers--the icon typically disappears from one machine, but not the others. And it's not always the same computer. The network connection is still there--I can type \\myserver and get to the network shares. It's simply the icon that's disappearing. Has this happened to anyone else? Any suggestions for a fix? Thanks in advance.

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After virus, Chrome & Internet Explorer won't connect to the internet, but Firefox works fine.

- by Zack

I cannot connect to the internet with Chrome or Internet Explorer. Firefox works fine. It seems it happens when I was infected by a "Trojan Horse Generic 17.BWIK", "Trojan Horse SHeur.UHL" and "Fake_Antispyware.FAH". I have removed the threats using AVG anti-virus security. I got Firefox working, but Chrome and IE still cannot connect. I do not want to loose Chrome History so re-setting would be my last option and uninstall and install will be out of the question. Is there a way around this? I am using XP Pro on a desktop and DSL connection.

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Django freezes when adding objects through the admin

- by Quartz

I have a Django 1.1 website running via Apache/mod_wsgi with a PostgreSQL 8.3.1 database. Recently, when I added objects through the admin interface, the connection froze up and I lost several worker processes, so I had to restart Apache. Upon trying to replicate this, I found that it only happens through the admin: if I go into the Django shell and issue the same insert, it works fine. Also, performing an UPDATE operation works without issues, so just INSERTs. I've rebuilt indexes on PostgreSQL and run a full VACUUM. Error logs don't show anything, and I can't figure out for the life of me what's wrong. Anyone have any ideas?

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Root certificate authority works windows/linux but not mac osx - (malformed)

- by AKwhat

I have created a self-signed root certificate authority which if I install onto windows, linux, or even using the certificate store in firefox (windows/linux/macosx) will work perfectly with my terminating proxy. I have installed it into the system keychain and I have set the certificate to always trust. Within the chrome browser details it says "The certificate that Chrome received during this connection attempt is not formatted correctly, so Chrome cannot use it to protect your information. Error type: Malformed certificate" I used this code to create the certificate: openssl genrsa -des3 -passout pass:***** -out private/server.key 4096 openssl req -batch -passin pass:***** -new -x509 -nodes -sha1 -days 3600 -key private/server.key -out server.crt -config ../openssl.cnf If the issue is NOT that it is malformed (because it works everywhere else) then what else could it be? Am I installing it incorrectly? Update I tried changing the certificate attributes, but to no avail: openssl genrsa -des -passout pass:***** -out private/server.key 2048 openssl req -batch -passin pass:***** -new -x509 -nodes -sha256 -days 3600 -key private/server.key -out server.crt -config ../openssl.cnf

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Network on linux server is periodically down

- by Fabian

I have an old server running Fedora 4 that occasionally just stops responding via network for about an hour. This happens 1-2 times a week. Also no connection from the server itself to any other computer on the network is possible when it happens. The network settings and routes look fine. There are no unusual log messages and no unusual processes running at that time. If I restart the network or just do an ifconfig eth0 down & ifconfig eth0 up it works fine afterwards. I know that the server should be updated to a currently supported OS, but that is not really an easy option right now. Any ideas on how I could diagnose and fix that problem?

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NAT Error Message - Usage limit exceeded

- by Kato

Trying to configure a port to use for Vuze. Using the NAT/server port test, I was getting a message saying the connection timed out, the port was probably closed. I went back and made sure to open the specific port on my router, firewall, etc, but now I'm getting "NAT Error - Usage limit exceeded (173.32.41.24:0). I'm on a mac pro running leopard, trial versions of intego netbarrier and virusbarrier. Network utilities and netbarrier both claim the port is open. I've tested a bunch of other ports, but all give the same message.

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Is there a way to stream wirelessly from a laptop to a TV?

- by Robsta

I heard of such a thing like a box or a media player such thing that can connect wirelessly to stream movies from my laptop? Is there such a thing that can do it? How is the latency on it? I have fast internet so that's not an issue, or is there such a box that connects with Bluetooth for better connection? I need these box to also be able to browse the internet because I'd like to stream movies from YouTube. I have heard of a thing called boxee, but is that what I'm looking for? I have windows 7 as my os, with an HDMI out and a GPU with a 555m. My laptop is powerful enough and my internet is 25mbps with a cap of 150GB. All i would really like to know is what this device is called? A media box?

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MSDTC Port 135 open bi-directionally

- by Stephen Lacy

I have two servers, a web application server and an SQL Server database running on its own server. I have a firewall between these two servers. Do I have to open port 135 on both the SQL Server and the Web Application Server. Does the SQL Server open its own connection to the Web Application Server on port 135 or any other port? Do I have to in component services point the Web Application Server MSDTC at the SQL Database Server? If the firewall is completely open, the settings in component services set to allow remote connections, remote administration etc is there any other settings that need to be changed in order to allow remote connections to the SQL Server MSDTC?

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Oracle Worldwide Product Translation Group and Applications User Experience Working Together

- by ultan o'broin

The Applications User Experience (UX) Mobile team has been extending its ethnographic research to even more countries. Recently, the team conducted research in Sweden, and I am pleased to say I made the connection for the UX team with the Oracle's Worldwide Translation Product Group (WPTG) local (that is, in-country) language specialists. It struck me that WPTG's local market knowledge and insight that we heard about at an Oracle Usability Advisory Board meeting in the UK in 2011 would be very valuable to the UX efforts while, at the same time, UX could afford WPTG an opportunity to understand our design and development direction so that linguistic resources (terminology, style guides, translatability guidelines, and so on) for any translation of our mobile solutions could be prepared in advance. Brent White of the Mobile UX team takes notes as ethnography participant Capri Norman uses mobile technology to work in Stockholm. Pic credit: Oracle Applications UX. The UX team acknowledges Capri's kind permission to use this image. I'm told by Brent White of the Mobile UX team that the co-operation was a big success. A WPTG Swedish language specialist joined a couple of ethnographic sessions, taking great notes and turning them around very fast for the UX team. And of course, a great local insight into Swedish culture and ways of working was provided too, along with some nice socializing! More research in more countries is planned. Watch out for future blog posts and other communications about this great co-operation worldwide.

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Server suddenly running out of entropy

- by Creshal

Since a reboot yesterday, one of our virtual servers (Debian Lenny, virtualized with Xen) is constantly running out of entropy, leading to timeouts etc. when trying to connect over SSH / TLS-enabled protocols. Is there any way to check which process(es) is(/are) eating up all the entropy? Edit: What I tried: Adding additional entropy sources: time_entropyd, rng-tools feeding urandom back into random, pseudorandom file accesses – netted about 1 MiB additional entropy per second, problems still persisted Checking for unusual activity via lsof, netstat and tcpdump – nothing. No noticeable load or anything Stopping daemons, restarting permanent sessions, rebooting the entire VM – no change in behaviour What in the end worked: Waiting. Since about yesterday noon, there are no connection problems anymore. Entropy is still somewhat low (128 Bytes peak), but TLS/SSH sessions have no noticeable delay anymore. I'm slowly switching our clients back to TLS (all five of them!), but I don't expect any change in behavior now.

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Virtual PC "The page cannot be displayed" error connecting to iis7.5 site on Win7 host.

- by stan

I setup virtual pc with the Windows XP IE6 VHD to test a site on Windows 7 host. I created a loopback adapter connection on the host. I have several sites on IIS 7.5, I'm able to connect to all of them except one. And it's the site I need to test... I get "The page cannot be displayed" error. The site loads fine from the host(Windows 7). I've made sure the permissions match that of the other sites that do load. I've recreated the application in IIS manager. Does anyone know what the problem might be?

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How to split audio into multiple channels from optical S/PDIF or 1/8"?

- by Josh M.

I have a motherboard which has an optical S/PDIF output or 1/8". I'd like to "split" that signal into the appropriate channels so that I can then connect that to the wires behind my car's headunit which, in turn, run to the amp. The factory Bose amp just takes a single connector with a million wires running out of it, so that's why I would need to separate the signal into separate channels. On the other end there are four RCA connectors: front left, front right, rear left, rear right. The sub-woofer signal does not require an additional connection. Edit: Revised to include S/PDIF or 1/8".

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LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

- by Peter Mounce

I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

- by Peter Mounce

Crossposted from here I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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windows cache not working as it should?

- by piotrektt

I run windows 2012 server with data center. The setup is with 60GB of RAM. I have one file shared on VHD and when I copy this file locally the RAM cache is all used up but when multiple computers connect to the share it the cache is not used. The network is 8Gb. The whole network is around 200 computers that need to read that one file but on this setup only 10 connection kills the server. Is there any way to check what is going on? What other solution can I use to manage cache in windows?

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pinx 501 with print server - 10 licenses

- by ra170

I have pix 501 with only 10 licenses. I'm already approaching this limit, running 2 computers at home, 2 laptops, PS3, iphones, 2 web cams..not everthing is on all the time, but it's possible as I'm looking into adding a print server, so that I can print from anywhere in the house. So my question is, will the print server count as a connection towards the license? I think it will need default gateway, which in this case will be my pix 501. I've seen somewhere on some othee board saying, don't set default gateway in the print server to pix 501, but then how would that work? is there a work around? I don't need to print from VPN or from outside, just inside..

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Can't start firewall or automatic updates in Windows XP

- by Chris Porter

On a friends laptop following some viruses infestations there is a problem in starting the Windows firewall. The error is: Could not start the Windows Firewall/Internet Connection Sharing(ICS) service on Local Computer. Error 2: The system cannot find the file specified When attempting to turn on automatic updates in the security centre, the message is: We're sorry. The Security Center could not change your Automatic Updates settings. To try changing these settings yourself, go to System in Control Panel. On the Automtic Updates tab, select Automatic (recommended), and then click OK. All the options under "Automatic Updates" are greyed out. I've tried the suggestions below and many others: http://windowsxp.mvps.org/sharedaccess.htm http://support.Microsoft.com/kb/892199 http://windowsxp.mvps.org/repairwmi.htm I can't do a repair install because the installer doesn't detect existing versions. It's XP pro service pack 3.

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Kill ssh background process after disconnect / timeout?

- by keflavich

I frequently use ssh tunnels to access VNC sessions on remote machines, but this is on my laptop so the connections break when I put it to sleep for the night. If I then try to re-open the connection in the morning, I have to manually kill the ssh session, otherwise I get this error: bind: Address already in use channel_setup_fwd_listener: cannot listen to port: 1202 Could not request local forwarding. The SSH command I'm using is this: ssh -N -C -f -L 1202:localhost:5900 name@server What's the best way to have the ssh tunnel die when it disconnects? Or reset?

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Connecting to a computer using Remote Desktop does not work first time

- by dev

Hi all, I'm having a weird sort of problem with Remote desktop and that too, only on one machine. If I boot up this machine, and then try to Remote desktop into it, it does not work.( I get the following error: The client could not connect to the remote computer. Remote connections might not be enabled or the computer might be too busy to accept new connections. It is also possible that network problems are preventing your connection. Please try connecting again later. If the problem continues to occur, contact your administrator. ) But if I physically log into it & then log out, and then try to Remote desktop into it, it works flawlessly. The problematic machine is Xp 64 Bit, but other systems with Xp 64 Bit work fine. Any Ideas on how to solve this?

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No Internet for Created VLan on Cisco CE500

- by Jennifer

I'm new here and also with networking but i can't set internet conection for some vlan created. I have a Cisco CE500 switch and created 4 vlans define by the roles in the switch. Vlan 2: Servers (role) (port 3-4) Vlan 3: Desktop (role) (port 5-8) Vlan 4: Guest (role) (port 9-12) Vlan 1 is default, Connect to the ADSL Modem/Router Port 2 assign to the Router Role (vlan 1) The switch is connected on port2 the ADSL Modem (DHCP) 192.168.2.254 The goal is: All Vlan should have internet connection. Vlan 2 and 3 should see each other but not Vlan 4 I can enter the switch CLI but dont know which command to enter. Thanks 4 ur time and replies Jennifer

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Disable ALTQ for internal network traffic

- by javanix

I currently have a FreeBSD 8.2 media server set up on my LAN that I use to stream my music from. I also have an SSH login that I use to do file transfers to and from this server remotely. I would like to set up ALTQ (and have gotten this working) to limit my outgoing bandwidth from the server for SSH traffic. However, configuring ALTQ this way is also limiting my internal traffic (and thus interfering with my music streaming) since I am only using a single network interface. Can anyone show me how I would use PF and ALTQ to limit outgoing WAN traffic while allowing all internal LAN traffic to go through unhindered? ext_if="eth0" int_if="eth0" altq on eth0 cbq bandwidth 1Mb queue { std, ssh } queue std bandwidth 80% cbq(default) queue ssh bandwidth 20% cbq(ecn) pass out on eth0 proto tcp to port 22 queue ssh eth0 is my LAN interface, my total WAN bandwidth on my cable connection is 1Mb/s, and my internal network is 10/100.

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LPR command won't recognize CUPS printer

- by Datapimp23

I have a cups server with one shared printer configured on it. It prints test pages without problems. printername (Idle, Accepting Jobs, Shared) Description: desc Location: Driver: Zebra ZPL Label Printer (grayscale, 2-sided printing) Connection: socket://172.20.50.26 Defaults: job-sheets=none, none media=oe_w288h432_4x6in sides=one-sided This is the output from lpstat -t. it shows that the printer is idle and accepting requests admin@SERVER:~$ lpstat -t scheduler is running no system default destination device for printername: socket://172.20.50.26 printername accepting requests since Thu 26 Jan 2012 01:29:35 PM CET printer printername is idle. enabled since Thu 26 Jan 2012 01:29:35 PM CET Now when I want to send a printjob to it via an LPR command it won't recognize the printer /usr/bin/lpr -P printername test.pdf Result lpr: ttn_seg_zebra1: unknown printer What am I missing here ?

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Intermittent USB 3.0 access - How do I troubleshoot?

- by Billy ONeal

I've got a WD Passport hard disk with "superspeed" USB 3.0 support. When I use my USB 3.0 flash drive (this is a Lenovo X220 laptop), USB 3.0 consistently works. But when I use the passport drive, almost without fail the connection drops to USB 2.0. Touching the cable seems to immediately trigger the problem, but it seems to happen on its own though. I've got another cable on order right now... but is it likely the cable's the issue here? Is there anything else I can check?

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