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• Rendering a control generates security exception in .Net 4

  - by Jason Short

  I am having a problem with code that worked fine in .Net 2 giving this error under .Net 4. Build (web): Inheritance security rules violated while overriding member: 'Controls.RelatedPosts.RenderControl(System.Web.UI.HtmlTextWriter)'. Security accessibility of the overriding method must match the security accessibility of the method being overriden. This is in DotNetBlogEngine. There were several other security demands in the code that .Net 4 didn't seem to like. I followed some of the advice I found on blogs (and here) and got rid of all the other errors. But this one still eludes me. The Main blogengine core dll is not set for security demands anylonger and is compiled for .Net 4 as well. This error is in the website side attempting to use the dll. There are controls that call a RenderControl method taking an HtmlTextWriter. Apparently the text writer now has some soft of security attributes set on it. Each of the controls implements a custom interface ( public interface ICustomFilter ), there are no security permissions present or demands. The site is running full trust on my local dev machine.

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• Bizarre and very specific Internet connection loss

  - by Synetech

  Yesterday (Friday, September 21, 2012), my Internet connection started acting up. After some testing, I confirmed a very specific and baffling set of symptoms: Internet connection goes away every 25-35 minutes (I did not confirm the exact interval, but it seems to be about 30 mins.) Only some protocols are affected; HTTP*, P2P, etc. stop working; FTP, etc. continue to work When it’s stopped, cannot even ping router or cable-modem IPs or view their firmware pages Domain-names and IPs are irrelevant (for protocols that stop working, neither work, for those that still work, both work) Resetting router fixes it for another 30 minutes Keeping the connection idle or active doesn’t seem to make a difference (nor the bandwidth usage in that period) Connecting directly to cable-modem allows it to work indefinitely Disconnecting the router from the cable-modem works indefinitely (no Internet connection obviously, but can still access router IP and firmware page) Connecting the router to the cable-modem, but putting the modem on standby also works indefinitely Same problem with both a wireless laptop and wired (on any port) desktop (both Windows 7; will try to test Windows XP when possible) Nothing had changed in the days leading up to the issue. No modifications to the networking configuration or the router; there were not even any Windows updates except for an MSSE definition update. Waiting does not fix it, nor does any amount of fiddling with anything; only resetting the router fixes it for 30 minutes (resetting the cable-modem doesn't work either) I tried cleaning the pins in the router’s plugs, but that didn’t help, which was not really a surprise since I was not getting a lost connection error. Obviously my first thought was that the router was having a problem, and this is borne out by some tests. The problem is that when it drops, it is not a full drop since I can still do things like ftp ftp.mcafee.com and such which means that the connection and DNS are still working. Moreover, if it were the router, then why does it stay alive indefinitely when not connected to the cable-modem (i.e., no outside influence)? The problem doesn't seem to be either the cable-modem nor the router, but rather an interaction between the two, like something from the outside (port scan? hacker? ISP?) that is triggering a problem in the router. I see that there have been a couple of vulnerabilities for the DI-524, but those were a while back and should be fixed since I have the last firmware for it. I don’t think it’s my ISP (Rogers) since I have been using the router for several years without problem and can connect indefinitely when bypassing it. But I can’t rule them out since that is one of the only possible things that could have suddenly changed. Does anybody have any ideas of explanations, fixed, or tests? (I note that when I opened the router, I heard a very high-pitched noise from somewhere near the capacitors/ferrite ring which I don’t think I heard the last time I opened it a few years ago, but then if it were that, then why would it affect only a very small, specific set of functions?)

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• Remote server security: handling compiler tools

  - by Gonzolas

  Hello! I was wondering wether to remove compiler tools (gcc, make, ...) from a remote production server, mainly for security purposes. Background: The server runs a web application on Linux. Consider Apache jailed. Otherwise, only OpenSSHd faces the public network. Of course there is no compiler stuff within the jail, so this is about the actual OS outside of any jails. Here's my personal PRO/CON list (regarding removal) so far: PRO: I had been reading some suggestions to remove compiler tools in order inhibit custom building of trojans etc. from within the host if an attacker attains unpriviliged user permissions. CON: I can't live without Perl/Python and a trojan/whatever could be written in a scripting language like that, anyway, so why bother about removing gcc et al. at all. There is a need to build new Linux kernels as well as some security tools from source directly on the server, because the server runs in 64-bits mode and (to my understanding) I can't (cross-)compile locally/elsewhere due to lack of another 64-bits hardware system. OK, so here are my questions for you: (a) Is my PRO/CON assessment correct? (b) Do you know of other PROs / CONs to removing all compiler tools? Do they weigh in more? (c) Which binaries should I consider dangerous if the given PRO statement holds? Only gcc, or also make, or what else? Should I remove the enitre software packages them come with? (d) Is it OK to just move those binaries to a root-only accessible directory when they are not needed? Or is there a gain in security if I "scp them in" every time? Thank you!

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• How to prevent getting infected by rogue security applications

  - by Ieyasu Sawada

  My computer never got infected with a virus before, because I'm using Web of Trust browser plugin, sandboxie and Avast Free antivirus. But today, it got infected with a rogue security application called antivirus.net. I have already removed it using MBAM, SAS, and Kaspersky Virus Removal Tool. And by the way, I was using MSE when my laptop got infected. Seems like the rogue application just killed off the MSE process. And I never even got a warning. I was using the wi-fi from our school, which I think is the cause since most of the computers in our laboratory has rogue applications on it. My question is, how do I prevent this from happening again? It took me about 6 hours to disinfect my computer and I don't want it to happen again. Please enlighten me if these rogue applications really just pop out of nowhere. Note I'm not dumb enough to agree with installing rogue security applications. It just came out of nowhere. I'm happy with MSE, well not after it let antivirus.net penetrate my computer. I've done a little bit of research and it says that it needs the permission of the user to actually install it in the computer: http://www.net-security.org/malware_news.php?id=1245 http://en.wikipedia.org/wiki/Rogue_security_software Is it possible that other computers in our school network have agreed to install those? Or maybe the network admin?

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• Google chrome not accepting any security certificates

  - by Jerry

  I've recently developed a problem with Google Chrome that's really annoying. I'm using Firefox at the moment with no problems whatsoever and it's the same with IE, so it's safe to say this problem is specific to Chrome. The problem is that it's not accepting security certificates from certain sites. I suppose the best place to start would be google itself. I can't search. The google search page will load but when I type some search term into the search box and hit 'search' I get the message: "You attempted to reach www.google.com, but the server presented an invalid certificate. You cannot proceed because the website operator has requested heightened security for this domain." No matter what the search term is, this is the result. Also when I try to log in to facebook - same message. Youtube works and many other sites that I know present security certs so I'm baffled. I've searched and there are other people who have had similar issues but I can't find a solution anywhere. The most common answer I'm picking up for this is to "check your system time" but I can safely say that it's not my system time. If anyone knows what is going on, I'd very much appreciate being informed. It's not super urgent as I can use Firefox to access those places Chrome won't, but it IS super annoying because I can usually sort out issues like this in no time.

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• Internet Explorer keeps asking for NTLM credentials in Intranet zone

  - by Tomalak

  Long text, sorry for that. I'm trying to be as specific as possible. I'm on Windows 7 and I experience a very frustrating Internet Explorer 8 behavior. I'm in a company LAN with some intranet servers and a proxy for connecting with the outside world. On sites that are clearly recognized as being "Local Intranet" (as indicated in the IE status bar) I keep getting "Windows Security" dialog boxes that ask me to log in. These pages are served off an IIS6 with "Integrated Windows Security" enabled, NTFS permits Everyone:Read on the files themselves. If I enter my Windows credentials, the page loads fine. However, the dialog boxes will be popping up the next time, regardless if I ticked "Remember my credentials" or not. (Credentials are stored in the "Credential Manager" but that does not make any difference as to how often these login boxes appear.) If I click "Cancel", one of two things can happen: Either the page loads with certain resources missing (images, styleheets, etc), or it does not load at all and I get HTTP 401.2 (Unauthorized: Logon Failed Due to Server Configuration). This depends on whether the logon box was triggered by the page itself, or a referenced resource. The behavior appears to be completely erratic, sometimes the pages load smoothly, sometimes one resource triggers a logon message, sometimes it does not. Even simply re-loading the page can result in changed behavior. I'm using WPAD as my proxy detection mechanism. All Intranet hosts do bypass the proxy in the PAC file. I've checked every IE setting I can think of, entered host patterns, individual host names, IP ranges in every thinkable configuration to the "Local Intranet" zone, ticked "Include all sites that bypass the proxy server", you name it. It boils down to "sometimes it just does not work", and slowly I'm losing my mind. ;-) I'm aware that this is related to IE not automatically passing my NTLM credentials to the webserver but asking me instead. Usually this should only happen for NTLM-secured sites that are not recognized as being in the "Intranet" zone. As explained, this is not the case here. Especially since half of a page can load perfectly and without interruption and some page's resources (coming from the same server!) trigger the login message. I've looked at http://support.microsoft.com/kb/303650, which gives the impression of describing the problem, but nothing there seems to work. And frankly, I'm not certain if "manually editing the registry" is the right solution for this kind of problem. I'm not the only person in the world with an IE/intranet/IIS configuration, after all. I'm at a loss, can somebody give me a hint?

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• No internet connection using Edimax routers

  - by idan315

  I have two computers connected to a router, connected to my ADSL modem by PPPoE. One of those computrs use Windows XP, the other uses Windows 7. The computer using Windows 7 keeps getting limited or no connectivity, and I can't use it to connect to the internet. Connecting the computer to the modem without the router 'in the way' worked, and I was able to use the internet - which led me to believe that the problem is with my router. However, I have changed my router, and the problem persists. I am really lost on how to approach this problem. Possible leads: when I view the network information, I see that my computer is connected to 'Multiple Networks'. One of those is "Network 4" (probably my router), and the other is Unidentified network. I don't know how to make the "Unidentified Network" disappear, or why is it even there in the first place. When I try using "ipconfig", I have two default gateway IPs. The first is 0.0.0.0, and the second is the IP of my router (192.168.2.1). The first router was Edimax BR-6204Wg. The second one I've tried connecting is BR-6424n. Any ideas?

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• Windows 8 - no internet connetction to some hosts while VPN is active

  - by HTD

  I use VPN to access the servers at work. When VPN is used, all network traffic to the Internet passes through my company network. It worked without any problems on Windows 7, now on Windows 8 some sites suddenly became inaccessible. Please note - I don't try to connect them over RDP, they are public Internet addresses, outside company network. They are inaccessible using any protocol. Ping returns "General failure.". I know it could be a misconfiguration on my company's server side, but it's very strange, since the same VPN connection used on Windows 7 works properly. What's wrong? Is it a Windows 8 bug, or is there something I could do on my company servers to make VPN work as expected with Windows 8? My company network works on Windows Server 2008 R2 and uses Microsoft TMG firewall. I couldn't find any rules blocking the traffic to mentioned sites, all network traffic for VPN users are passed through for all IPs and protocols. Any clues? UDPATE: Important - one whole day it worked. I hibernated and restarted the computer, connected and disconnected VPN - nothing could break my connection. Today it broke again, and restarting Windows didn't help. And now the solution: route add -p 0.0.0.0 MASK 255.255.255.255 192.168.1.1 Oh, OK, I know what it did, added my default gateway to routing table. But it still didn't work sometimes. So I removed my main network gateway route with: route delete -p 0.0.0.0 MASK 0.0.0.0 192.168.0.1 And added modified with: route add -p 0.0.0.0 MASK 255.255.255.255 192.168.0.1 And it works. Now. But I don't trust this. I don't know what really happened.

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• Windows 8 Internet Explorer proxy automation script

  - by Stefan Bollmann

  Similar to this post, I'd like to change my proxy settings using a script. However, it fails. When I am behind the proxy, IE does not connect to the internet. Here I try the first solution from craig: function FindProxyForURL(url, host) { if (isInNet(myIpAddress(), "myactualip", "myactualsubnetip")) return "PROXY proxyasshowninpicture:portihavetouseforthisproxy_see_picture"; else return "DIRECT"; } Also this test, where isInNet should surely return true does not help: function FindProxyForURL(url, host) { if (isInNet("myactualip", "myactualip", "myactualsubnetip")) return "PROXY proxyasshowninpicture:portihavetouseforthisproxy_see_picture"; else return "DIRECT"; } **This script is saved as proxy.pac in c:\windows and my configuration is* in LAN settings: No automatically detected settings, yes, use automatic config script: file://c:/windows/proxy.pac No proxy server. *(i am not allowed to post screenshots..) So, what am I doing wrong? ---------------- update -------------- However, when I set up a proxy in my LAN configurations: IE -> Internet Options -> Connections -> LAN Settings check: Use a proxy Server for your LAN Address: <a pingable proxy> Port: <portnr> everything is fine for this environment. Now I try a simpler script like function FindProxyForURL(url, host) { return "PROXY <pingable proxy>:<portnr>; DIRECT"; } With a configuration described above** I am not able to get through the proxy.

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• How to remove google ads virus from IE?

  - by msbg

  I have picked up adware in that shows extra irrelevant google ads. This only happens in Internet Explorer 10, not Firefox or Iron. I have tried some removals for similar viruses with no luck. I have scanned with MalwareBytes, Windows Defender(I am using Windows 8 RTM, so this is the same as MSE), Spybot, Ad Aware, McAfee, Norton, and AVG, with no luck. Here's a screenshot: As you can see, ads are added to the tan area as well as several extra white results, which are especially irrelevant. I like IE10 and would like to keep using it, but these ads are annoying. I'm also worried there may be spyware as well.

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• Java works under Firefox but not under Internet Explorer

  - by Dominic Grenier

  Java works under Firefox but not under IE. Java applet activated in security settings, activated in add-ons, activated in advanced tab; that's the advice they usually give in forums... I've also deleted my temporary internet files, reinstalled IE8 and it is also set as the default java for IE through the control panel. IE version: 8.0.6001.18702 Java version: 1.7.0_03. Windows XP SP3. Any advice? Thanks :)

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• Internet Explorer 8 Loses Cookies

  - by Mikeon

  I'm running Windows 7 for some time now and use Internet Explorer 8 as my main browser. What I've noticed is that it "loses" cookies A LOT! I mean it! Typical situation: I log in into a side checking the remember me checkbox. I reboot the computer/restart the browser, go to the site, get logged in automatically - I'm happy. From time to time however, I'm asked for the credentials. Normal situation you would say. So would I if it didn't happen few times a week. Come on! On Internet Explorer 7 I didn't notice this as much. Cookies were lost once a quarter or so. Note that i was using IE7Pro with my IE - dunno however if it has anything to do with my current problem. Anyway I wonder if this behavior is "normal" or is it only me? more info for people that suggest it may be normal - cookie expiring and stuff. When it happens I loose all auth cookies - gmail, bloglines and whatnot!

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• Wiring my internet

  - by u8sand

  I have Verizon internet service and am currently using wifi. My router is in the basement and my desktop computer is 2 floors and on the other side of the house above it... Worst possible positioning but that's just how things worked out. My wireless currently is extremely unstable so I've decide to correct the problem by wiring my computer directly. The problem lies here: when redoing the room next to it (when the wall was open) we went ahead and wired some coaxial cable from our attic to our basement (with plenty of slack on both ends, don't ask me why we didn't go ahead and wire a CAT6 cable). The question is: Can I use the coaxial cable to bring me internet connection? Naturally the router (which needs to stay where it is) takes a coaxial cable input and has Ethernet outputs. So maybe I would have to take a ethernet cable, convert to coaxial-coaxial to my computer, convert back to ethernet. Is this even possible to convert from coaxial to ethernet? Or do I have to attempt to go ahead and fish a cat6 cable through my house. I cannot just split the signal because that would require two routers and two networks (which I don't believe would work with one cable-one ISP correct me if I'm wrong). Thanks

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• Google Chrome Launches Internet Explorer on Win7 64-bit

  - by chris.nullptr

  I recently had a nasty trojan on my box have one problem that has persisted after getting rid of it using Microsoft Security Essentials. Launching the chrome.exe executable results in iexplore.exe being launched instead. I have tried uninstalling/reinstalling chrome several times to no avail. What could be causing this behavior and how can I fix it?

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• Problem Uninstalling Microsoft Internet Explorer

  - by Roger F. Gay

  On Windows Vista Home Premium (x64) I am trying to uninstall Microsoft Internet Explorer. The procedures explained all over the web involve going through the control panel to Programs and Features. If MSIE is listed there, then uninstall in the usual way. If it is not listed there, click Turn Windows features on and off and deactivate it there. But Internet Explorer is not listed in either place. Background: I initiated some process in MSIE a couple of months ago that caused all web pages to no longer save login information or remain logged in when requested. As you can tell from the way I described that, I don't remember what it was and have no way to simply reverse it. I had a few problems with .NET Framework as well. So, I've uninstalled all browsers except MSIE and uninstalled .NET Framework. I've reinstalled .NET Framework and all other browsers. I have not been able to uninstall MSIE. Have Tried: I tried installing over the existing installation, but auto-update must be keeping it nicely up to date. The attempt simply produced an information window telling me that my current version is more up-to-date than the new version I tried to install.

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• Rails app returns HTTP 422 for new ServerAlias - Internet Explorer only

  - by Snips

  I have a long-standing Rails app running on Mac OS X (apache2). The set-up uses Apache virtual hosts and Passenger. The Rails app also uses HTTP Basic Authentication. I need to migrate the app from one url domain to another - with some overlap of both domain names being accessible simultaneously for a period. To do this, I've added the new domain name as a ServerAlias of the existing domain name in the Passenger Virtual Host config. I can now Browse the Rails app using both the legacy url, and the new url from any of Safari, Chrome, Firefox, or Internet Explorer. I can also 'HTTP post' updates to the Rails app using Safari, Chrome, or Firefox. All good. Except, attempts to post updates from Internet Explorer result in the Rails app rejecting the update, The Rails app log contains the message, ActionController::InvalidAuthenticityToken (ActionController::InvalidAuthenticityToken): I have other domains & aliases working just fine on this same machine. Any suggestions as to what is causing the Rails app to reject posts from IE would be appreciated.

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• Internet connection problem,ping ok , but outlook and browsers dont work

  - by Ashian

  Hi, From some days ago I have a big problem on my laptop( run windows xp sp3) When I connect to internet I can ping web sites but when try to browse them some times it work correctly and some times the connection to server intrupted and I have to refresh the page several times. in this case browser show a connection problem immediatly after I click on address bar or a link on page( wihtout any try to connect to server) I use FireFox and opera and both of them have this problem. try another ISP and still I have this problem. I didnt use any proxy server and check the proxy setting. In this case Outlook also can't connect to mail server. this problem anfter some time or after restart windows have been fixed for a while. I check for virus and can't find anything. Is there any idea how can I fix it? UPDATE: Thanks for your responses. I test them , also I use Open DNS setting and that dosent help me. last night I see that my local web application ( such as Adsl modem config web site , and sites that I set up on windows xo IIS ) aslo can't open and Internal Communication error apears ( Opera Message) that didnt relate to DNS settings or Internet connection.

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• Effects of internet connection speeds on server queries

  - by SephMerah

  Can my internet connection significantly effect queries run on phpmyadmin? I am currently 18 down and 30 up. I switched internet connections today and noticed a deep drop in query performance. The query that I am running is SELECT * FROM table. Simple. The table has one row of data. The MySQL server is on the same server as everything else. It is a VPS. Godaddy hosts. I dont have any other information. Centos 6.3 MySQL 5.1 PhpMyAdmin 3.4 Okay used google tools to inspect the XHR going out and coming in and this is what it reported. {"success":true,"message":"<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec )<\/div>","sql_query":"<div id=\"result_query\" align=\"\">\n<div class=\"success\">Your SQL query has been executed successfully ( Query took 0.0033 sec ) SNIP..................."}. So apparently my server is fine. The strange thing is though.. The returned XHR comes back exactly as soon as I execute the query on the page. It comes back within less than a second. Why PhpMyadmin does not report the change immediately. I am going to try a re-install.

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• Losing internet connection after few minutes (5-10 maybe)

  - by Korchkidu

  I took a computer that was not updated for months. Internet was working just fine so basically, I updated zonealarm, avast and installed all windows updates and especially SP3. After that, when I reboot, Internet works fine but after few minutes, Firefox says that the connection was reset. IE does not work either. However, my connection is still up and running as I can make a ping on www.google.com for example. Here are the solutions I tried with no success so far: 1) Uninstalling SP3; 2) Uninstalling IE8 and IE7; 3) Manually setting DNS and IPs; 4) Removed proxy settings from Firefox and IE; 5) Restarting DNS and DHCP related services; 6) Reset TCP/IP with netsh int ip reset c:\resetlog.txt; 7) Updated my ehternet card driver; 8) Restarted, tweaked all the connections in any directions and any configuration possible I believe; 9) Disabled Zone Alarm and Avast; Also, update kb981793 always fails on install. Please, help me as I spent two days already on this and I cannot find any solution. If I cannot fix this problem tomorrow, I will have to format-reinstall everything. Thanks for any help. Regards.

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• Windows 8 Internet Explorer 11 proxy automation script

  - by Stefan Bollmann

  Similar to this post, I'd like to change my proxy settings using a script. However, it fails. When I am behind the proxy, IE does not connect to the internet. Here I try the first solution from craig: function FindProxyForURL(url, host) { if (isInNet(myIpAddress(), "myactualip", "myactualsubnetip")) return "PROXY proxyasshowninpicture:portihavetouseforthisproxy_see_picture"; else return "DIRECT"; } This script is saved as proxy.pac in c:\windows and my configuration is* in LAN settings: No automatically detected settings, yes, use automatic config script: file://c:/windows/proxy.pac No proxy server. So, what am I doing wrong? ---------------- update -------------- However, when I set up a proxy in my LAN configurations: IE -> Internet Options -> Connections -> LAN Settings check: Use a proxy Server for your LAN Address: <a pingable proxy> Port: <portnr> everything is fine for this environment. Now I try a simpler script like function FindProxyForURL(url, host) { return "PROXY <pingable proxy>:<portnr>; DIRECT"; } With a configuration described above** I am not able to get through the proxy.

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• data transfer rate anomaly (internet)

  - by Nrew

  I tested my internet speed at speedtest.net. And go the result. .42Mbps Download and .21 Upload rate. My classmate got the same download speed of .42Mbps but has .87Mbps upload rate. Does upload rate affect the transfer rate?Because even though we got the same download speed. His transfer rate is about 100kbps downloading a movie from a torrent. And mine is only about 47kbps. Also the same torrent. And even direct download its always 47kbps. Is it possible to tweak something in order to have higher transfer rates. Other details: Were also both using the same ISP. The same slow ISP. And it seems that he's getting the most out of his connection even if his plan is lower than mine. I just don't know why I'm a loser at this. And when I try to complain to the ISP. They say that I'm getting the minimum speed and its okay. That really sucks. And I'm not using any router, so is he. The computer is directly connected to the internet using the modem provided by the ISP.

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• Internet keeps connecting and disconnecting

  - by OmerPT

  I have a PC running 32bit Windows 7 Professional. My wireless internet card is Edimax EW-7128G, it is inside my computer case and it is connected to an antenna. My problem is: I have a wireless connection to my router, the signal is fine and it's not slow or anything, but it just keeps disconnecting every 30 seconds or so, then connects back, then it disconnects, then connects back and so on. This is new - it only started about a week ago, everything worked just fine until then. I know it's not a problem with the router because: Other computers can connect to it easily and they work just fine, no disconnections (My phone too). I know it's not a problem with the computer or the wireless card itself because: I have Ubuntu installed side-by-side with my Windows, and when I switch to Ubuntu the internet works great. This caused me to think it's probably a problem with the wireless card drivers installed on windows (Ubuntu auto-installed them, I installed them manually on windows): I tried uninstalling them, and then installing them back again, sadly that didn't help. I'm kind of lost here - can anyone think of anything else I should try? Thanks :)

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• Ubuntu 12.04 share the internet over WiFi from wvdial?

  - by Sour Lemon

  I have just installed Ubuntu 12.04 on a separate partition on my hard drive so I can dual boot to either Windows 7 or Ubuntu. I am living in Japan and so I'm using a mobile broadband USB device called "Softbank C02LC". By default it seems that this device isn't recognised so I did the following: Terminal: sudo su nano /usr/bin/usbModemScript Nano: #!/bin/bash echo 1c9e 9900 > /sys/bus/usb-serial/drivers/option1/new_id Terminal: chmod +x /usr/bin/usbModemScript nano /etc/udev/rules.d/option.rules Nano: ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9900", RUN+="/usr/bin/usbModemScript" ATTRS{idVendor}=="1c9e", ATTRS{idProduct}=="9900", RUN+="/sbin/modprobe option" which made the device visible from the network manager etc. However even though I set up my details correctly when I created a new connection (Correct username, APN etc) as soon as I try to connect it almost immediately disconnects. Because of this I then followed the instructions at this site: http://debugitos.main.jp/index.php?Ubuntu%2F%A5%E2%A5%D0%A5%A4%A5%EB%A5%A4%A5%F3%A5%BF%A1%BC%A5%CD%A5%C3%A5%C8 And I ended up using the c02lc_connect script at the bottom of the page to connect to the internet. The file contains the following bash script: #!/bin/sh usbinterfece=/dev/ttyUSB2 VID=1c9e PID=9900 WRONG_PID=f000 LSUSB=/usr/sbin/lsusb GREP=/bin/grep MODPROBE=/sbin/modprobe SWITCH=/usr/sbin/usb_modeswitch SWITCH_D=/etc/usb_modeswitch.d WVDIAL=/usr/bin/wvdial SLEEP=/bin/sleep SUDO=/usr/bin/sudo WHICH=/usr/bin/which switch_config="$SWITCH_D/$VID:$WRONG_PID" if ! [ -x $WVDIAL -a -x $SWITCH ]; then echo "Install wvdial and usb_modeswitch." exit 0 fi check_usb() { local vid="$1" local pid="$2" ($LSUSB | $GREP "$vid:$pid") } if ! (check_usb "$VID" "$PID"); then echo "Cannot find modem device..." if (check_usb "$VID" "$WRONG_PID") && ( [ -f "$switch_config" ] ); then echo "The device is attached but its mode is wrong." echo "Try usb_modeswitch..." $SUDO $SWITCH -c "$switch_config" $SLEEP 1 if (check_usb "$VID" "$PID"); then echo "Successfully switched the mode." else echo "Failed to switch the mode..." exit 1 fi else exit 1 fi fi if [ ! -c "$usbinterface" ]; then $SUDO $MODPROBE usbserial vendor=0x$VID product=0x$PID $SLEEP 2 fi $SUDO $WVDIAL which works completely fine - no problems what-so-ever. But we also have 1 more laptop here which I need to share the internet connection with. In Windows 7 I do this with the Connectify program, and in Ubuntu I have seen that you can do things like set up hotspots etc. But because I am using WvDial I am not sure how I would share the internet. I am only beginning to use Ubuntu but unfortunately until I can figure out how to share the internet over WiFi when connected via WvDial I have to stick with Windows. If you have any ideas on how to do this it would be much appreciated!

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• What does path finding in internet routing do and how is it different from A*?

  - by alan2here

  Note: If you don't understand this question then feel free to ask clarification in the comments instead of voting down, it might be that this question needs some more work at the moment. I've been directed here from the Stack Excange chat room Root Access because my question didn't fit on Super User. In many aspects path finding algorithms like A star are very similar to internet routing. For example: A node in an A* path finding system can search for a path though edges between other nodes. A router that's part of the internet can search for a route though cables between other routers. In the case of A*, open and closed lists are kept by the system as a whole, sepratly from any individual node as well as each node being able to temporarily store a state involving several numbers. Routers on the internet seem to have remarkable properties, as I understand it: They are very performant. New nodes can be added at any time that use a free address from a finite (not tree like) address space. It's real routing, like A*, there's never any doubling back for example. Similar IP addresses don't have to be geographically nearby. The network reacts quickly to changes to the networks shape, for example if a line is down. Routers share information and it takes time for new IP's to be registered everywhere, but presumably every router doesn't have to store a list of all the addresses each of it's directions leads most directly to. I'm looking for a basic, general, high level description of the algorithms workings from the point of view of an individual router. Does anyone have one? I presume public internet routers don't use A* as the overheads would be to large, and scale to poorly. I also presume there is a single method worldwide because it seems as if must involve a lot of transferring data to update and communicate a reasonable amount of state between neighboring routers. For example, perhaps the amount of data that needs to be stored in each router scales logarithmically with the number of routers that exist worldwide, the detail and reliability of the routing is reduced over increasing distances, there is increasing backtracking involved in parts of the network that are less geographically uniform or maybe each router really does perform an A* style search, temporarily maintaining open and closed lists when a packet arrives.

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• .NET Declarative Security: Why is SecurityAction.Deny impossible to work with?

  - by rally25rs

  I've been messing with this for about a day and a half now sifting through .NET reflector and MSDN docs, and can't figure anything out... As it stands in the .NET framework, you can demand that the current Principal belong to a role to be able to execute a method by marking a method like this: [PrincipalPermission(SecurityAction.Demand, Role = "CanEdit")] public void Save() { ... } I am working with an existing security model that already has a "ReadOnly" role defined, so I need to do exactly the opposite of above... block the Save() method if a user is in the "ReadOnly" role. No problem, right? just flip the SecurityAction to .Deny: [PrincipalPermission(SecurityAction.Deny, Role = "ReadOnly")] public void Save() { ... } Well, it turns out that this does nothing at all. The method still runs fine. It seems that the PrincipalPermissionAttribute defines: public override IPermission CreatePermission() But when the attribute is set to SecurityAction.Deny, this method is never called, so no IPermission object is ever created. Does anyone know of a way to get .Deny to work? I've been trying to make a custom secutiry attribute, but even that doesn't work. I tried to get tricky and do: public class MyPermissionAttribute : CodeAccessSecurityAttribute { private SecurityAction securityAction; public MyPermissionAttribute(SecurityAction action) : base(SecurityAction.Demand) { if (action != SecurityAction.Demand && action != SecurityAction.Deny) throw new ArgumentException("Unsupported SecurityAction. Only Demand and Deny are supported."); this.securityAction = action; } public override IPermission CreatePermission() { // do something based on the SecurityAction... } } Notice my attribute constructor always passes SecurityAction.Demand, which is the one action that would work previously. However, even in this case, the CreatePermission() method is still only called when the attribute is set to .Demand, and not .Deny! Maybe the runtime is actually checking the attribute instead of the SecurityAction passed to the CodeAccessSecurityAttribute constructor? I'm not sure what else to try here... anyone have any ideas? You wouldn't think it would be that hard to deny method access based on a role, instead of only demanding it. It really disturbed me that the default PrincipalPermission appears from within an IDE like it would be just fine doing a .Deny, and there is like a 1-liner in the MSDN docs that hint that it won't work. You would think the PrincipalPermissionAttribute constructor would throw an exception immediately if anything other that .Demand is specified, since that could create a big security hole! I never would have realized that .Deny does nothing at all if I hadn't been unit testing! Again, all this stems from having to deal with an existing security model that has a "ReadOnly" role that needs to be denied access, instead of doing it the other way around, where I cna just grant access to a role. Thanks for any help! Quick followup: I can actually make my custom attribute work by doing this: public class MyPermissionAttribute : CodeAccessSecurityAttribute { public SecurityAction SecurityAction { get; set; } public MyPermissionAttribute(SecurityAction action) : base(action) { } public override IPermission CreatePermission() { switch(this.SecurityAction) { ... } // check Demand or Deny } } And decorating the method: [MyPermission(SecurityAction.Demand, SecurityAction = SecurityAction.Deny, Role = "ReadOnly")] public void Save() { ... } But that is terribly ugly, since I'm specifying both Demand and Deny in the same attribute. But it does work... Another interesting note: My custom class extends CodeAccessSecurityAttribute, which in turn only extends SecurityAttribute. If I cnage my custom class to directly extend SecurityAttribute, then nothing at all works. So it seems the runtime is definately looking for only CodeAccessSecurityAttribute instances in the metadata, and does something funny with the SecurityAction specified, even if a custom constructor overrides it.

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