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• I just got a virus 6 mins ago, how? Situation.

  - by acidzombie24

  -Edit- for the people who say it isn't a virus. Norton does detect it as a virus, an icon was placed on my system tray and rkpg.exe is in my C: which was placed 6 min ago around the time my computer rebooted on its own causing me to lose data :@. Situation I on Windows XP, behind a Linksys router, I don't have DMZ on so nothing should be connecting to me. I had Firefox, MSN and Visual Studio opened. With C# I programmed a quick application to scan some pages with Internet Explorer. The site it was scanning was deviantART (which is pretty trustworthy), I doubt any banners there would hold a virus. I went to a suspicious site called freetxt.com but that was on Firefox and it didn't load the site. With an extra check I ping it and got this message "Ping request could not find host freetxt.com." The virus seems to be called braviax. Right now it brought up a message saying my computer may be infected? How on earth did it get in? I don't have uTorrent installed or any torrent or p2p applications. Nothing is installed on my computer that I haven't installed before and I know the exact time it installed because I see rkpg.exe on my C drive and my computer restarted on its own around the same time. For the previous 30 minutes actually the previous hour all I did was talk on MSN, not click any links (I went to freetxt on my own) and had that Internet Explorer thing running (which I programmed). How did it get in? I really doubt it came from a banner on deviantART and installed when I loaded the page with the webbrowser-control so something else may have happened? Is there any system defaults I should turn off? I have remote assistance off but even if it was on I shouldn't be infected due to the router not forwarding any ports?

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• Sync Local ICS File with Android via Exchange/Outlook

  - by sinDizzy

  At my company we have a 3rd party app which tracks off-hours duty for all of our engineers. The app is not web-enabled and we cannot make any changes to it. It does write a simple text file and I have created an app that translates that to an ICS file. My goal is to have that appear on my calendar on my Android phone. Here is the path I am working on: DutyApp -- TextFile -- ICSFile -- Outlook(exchange) -- Android (via exchange sync) My problems: If I place the ICS file on our FILE server and then in Outlook if I go to the option CalendarOpen CalendarFrom Internet it shows up in Outlook and looks pretty good. After a couple minutes it shows up on my Android phone as well. If I change the original ICS file those changes never display in Outlook and never sync to my Android phone. This seems to be a one shot deal almost like an import. Now if I place the ICS file on our WEB server and then in Outlook if I go to the option CalendarOpen CalendarFrom Internet and use webcal:\ as the address, it shows up in Outlook and also looks pretty good. Any changes I make to the original ICS file display in Outlook. However the entire calendar never shows up in Android. This calendar is a subscription and it seems, although am not sure, that Android doesn't display Exchange subscription calendars. Yes I know it works with Gmail subscription calendars but this is Exchange. So my question is what other options are there? We are behind a firewall so cant link the ICS file to a Gmail account. I can't put the ICS file anywhere else other than our file or web server.

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• High data on recv-q buffer and thread lock on java.io.BufferedInputStream in linux

  - by Sagar Patel

  We have a java application running on linux (ubuntu server). We have been facing high recv-q problem since quite some time. Application gets hang and does not read data from socket every few hours. In thread dump, we have found below stack trace. "Receiver-146" daemon prio=10 tid=0x00007fb3fc010000 nid=0x7642 runnable [0x00007fb5906c5000] java.lang.Thread.State: RUNNABLE at java.net.SocketInputStream. socketRead0(Native Method) at java.net.SocketInputStream.read(SocketInputStream.java:150) at java.net.SocketInputStream.read(SocketInputStream.java:121) at java.io.BufferedInputStream.fill(BufferedInputStream.java:235) at java.io.BufferedInputStream.read1(BufferedInputStream.java:275) at java.io.BufferedInputStream.read(BufferedInputStream.java:334) - locked <0x00000007688f1ff0> (a java.io.BufferedInputStream) at org.smpp.TCPIPConnection.receive(TCPIPConnection.java:413) at org.smpp.ReceiverBase.receivePDUFromConnection(ReceiverBase.java:197) at org.smpp.Receiver.receiveAsync(Receiver.java:351) at org.smpp.ReceiverBase.process(ReceiverBase.java:96) at org.smpp.util.ProcessingThread.run(ProcessingThread.java:199) at java.lang.Thread.run(Thread.java:722) We are not able to trace the exact reason behind this? Kindly help. We are using 16 core machine and load on the system is around 30-40 at the time of issue. We use command ss dst <ip> to find out recv-q. Recently we have been facing issues with recv-q size getting hung, were in receive buffer gets stuck at some point of time. But recvQ size is not decreasing and as a result we are losing a lot of hits from the other side, our application is not accepting any data.

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• Can't run utilities/.exe's that use the network from a [DFS] windows share on Windows 2008 servers. Can this be overcome?

  - by Jim Lawhon

  Under Windows Server 2008 I'm unable to run many utilities that use network resources. This works just fine under Windows Server 2003. For example: \\domain\dfs\tools$\bin\sendmail.exe ... \\domain\dfs\tools$\bin\psexec.exe ... echo %_metric% %_value% %_unixtime% | \\domain\dfs\bin\foo$\nc graphite.domain 2003 -w1 Reproducing and maintaining this folder on a large number of servers/vm's is not desirable. Is there a way to allow Windows Server 2008 to run these tools? If so, can this be enabled via GPO or in a fashion that can be scripted during automated builds? Edit: The commands/tools do work just fine, when run from local drives. Edit2: Wget example: d:\scripts\helpers>z:\bin\wget http://www.google.com SYSTEM_WGETRC = c:/progra~1/wget/etc/wgetrc syswgetrc = z:/etc/wgetrc --2011-04-11 00:32:15-- http://www.google.com/ Resolving www.google.com... failed: Host not found. z:\bin\wget: unable to resolve host address `www.google.com' wget can neither use DNS to resolve the IP nor can it use HTTP if provided an IP directly. Edit3: The problem seems to be tied to DFS/DFS shares. Tools run correctly from other normal windows-server file-shares. They also run correctly when run directly from the file-servers behind the DFS. They only fail when we attempt to run them from the DFS UNC path or mapped drives.

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• Adding Multiple Interfaces to EC2 Ubuntu 12.04

  - by nocode

  I have a m1.medium Ubuntu 12.04 instance with two ENI's. I have a VPC setup with a private and public subnet. Private: 10.50.1.0/24 Public: 10.50.101.0/24 I initiated the instance on the private subnet. I configured a NAT instance and route all servers in the private subnet internet access. The route tables on the private subnet point towards the NAT instance and the route table on the public subnet point to the internet gateway. I am trying to add a public interface on the machine so that I can put it behind a ELB. When I added the second ENI and configured a static IP in /etc/network/interfaces and restarted the network services, I can no longer access from the Public subnet to the Private Subnet. Works Private private Private public Does not work Public private From Public Private, I ran a TCPDUMp on the private machine and can see the request coming in. My guess is it's trying to route over the new Public interface instead of the Private. Here's my route: default 10.50.1.1 0.0.0.0 UG 100 0 0 eth0 10.50.1.0 * 255.255.255.0 U 0 0 0 eth0 10.50.101.0 * 255.255.255.0 U 0 0 0 eth1 My networking knowledge is limited and I believe I have to add some routes but unsure of what command/syntax needs to be.

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• My SSD stopped working as it ends up in blue death right after windows 7 launches, how can I reset it for new windows install?

  - by HattoriHanzo

  As I mentioned in the title my SSD suddenly started to fail as after launching Windows 7 it goes straight to completely idle and after a few minutes it goes to blue death and restarts. I have an another HD with a windows xp on it and it works fine and I can also see the SSD and can access everything on it. Windows 7 on the SSD does work in safe mode though yet I didn't manage to find out what causes the problem. Since I can sill access the files and save them to another HD I'm looking for the best way to wipe and reinstall Windows 7. I have yet failed to find an easy to follow (or even understand) guide, different sources on the internet recommend different ways of doing this. And some guides are just simply full of terms I have no clue about. It's an OCZ Vertex 2 120GB. I"d very much appreciate if someone could give me an advice on what I should do, preferably in a way so I could regain the best possible performance as well. it doesn't matter if I don't understand the science behind it as long as I can follow the steps. Thanks!

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• Sending eMails in a external subnet in vmware ESXi

  - by user80658

  This might be a bit hard for me to explain - and it is a pretty individual situation. I got a native server at Hetzner (www.hetzner.de). The public IP is 88.[...].12. I got ESXi running on this server. I can access the esxi console by the public ip, but none of the virtual machines. That's why I bought a public subnet with 8 (6 usable) IPs (46.[...]) and an additional public ip (88.[...].26). This additional public ip belongs to the first virtual maschine - a firewall appliance - which is connected to the WAN. This need to be done this way - since it is the official way by hetzner. My 46. subnet is behind the firewall. I got a virtualmin server with dovecot imap/pop3 server. When sending a email, most provider (gmail) will accept those mails, but a lot will put it into spam (aol). My theory is: The MX line of my domain says of course the ip of the virtual machine (46.[...]), but in the raw email it says that email is sent by the ip of the firewall (88.[...].26), which doesnt sound trustworthy. A solution would be if the firewall could handle mail, but it simply cant. How can I prevent this problem? Thanks.

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• Centos repository packages vs latest developer release

  - by fran

  I have started to run a personal server using CentOS and I have noticed that many packages that are available to install from repository are old compared with the latest release from the developer. I know that installing packages from repository is very easy and I guess that the supplied versions are stable and prepared to work without any trouble, but I still find odd having so much software that lags behind the current version. It's my first time with linux and I don't know what is the "normal" thing, should I stick to whatever version the repository supplies, or try to get the latest from the developer? To be more precisely, the repository supplies the apache httpd web server with version 2.2, I wanted to update to 2.4, so I started removing apache and its dependencies packages that come with centos to use the latest ones, but when I was about to remove pcre v6 to replace it with v8, i found out that 132 installed packages depend on it and probably it is not a good idea to remove it, so that made me think twice about getting the latest software instead of using the packages supplied by the official repositories. Should I leave things as they are instead of going on an upgrade rampage? Thanks

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• How to limit reverse SSH tunelling ports?

  - by funktku

  We have a public server which accepts SSH connections from multiple clients behind firewalls. Each of these clients create a Reverse SSH tunnel by using the ssh -R command from their web servers at port 80 to our public server. The destination port(at the client side) of the Reverse SSH Tunnel is 80 and the source port(at public server side) depends on the user. We are planning on maintaining a map of port addresses for each user. For example, client A would tunnel their web server at port 80 to our port 8000; client B from 80 to 8001; client C from 80 to 8002. Client A: ssh -R 8000:internal.webserver:80 clienta@publicserver Client B: ssh -R 8001:internal.webserver:80 clientb@publicserver Client C: ssh -R 8002:internal.webserver:80 clientc@publicserver Basically, what we are trying to do is bind each user with a port and not allow them to tunnel to any other ports. If we were using the forward tunneling feature of SSH with ssh -L, we could permit which port to be tunneled by using the permitopen=host:port configuration. However, there is no equivalent for reverse SSH tunnel. Is there a way of restricting reverse tunneling ports per user?

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• Can a cur file have an alpha map (for high quality transparency)?

  - by Codemonkey

  I want to convert this Heroes of Newerth cursor into a cur file so I can use it as a cursor on windows and on my website. The cursor is now in a PNG file with an alpha map, and I have so far been unsuccessful in converting it to a cur file. The things I've tried is using the Photoshop cursor plugin to simply save the png as a cur. The result was a working cur file with a white background instead of a transparent one. I've also tried painting the background pure green (0, 255, 0) and saving as a cur file, in which case the background was still green when I tried using it as a windows cursor. I've also tried what's been mentioned in a few tutorials, which is selecting the area I want transparent and saving the selection in Photoshop (it then ends up as a new channel). So I selected the cursor and inverted the selection and saved it. The result was a bit odd. Instead of a transparent background, I now get a background that inverts the colours behind it, just like the "Windows inverted" mouse scheme. So is there any way to accomplish what I'm trying to do?

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• OpenVPN access to a private network

  - by Gior312

  There are many similar topics about my issue, however I cannot figure out a solution for myself. There are three hosts. A without a routable address but with an Internet access. Server S with a routable Internet address and host B behind NAT in a private network. What I've managed to do is a OpenVPN connection between A and B via S. Everything works fine so far according to this manual VPN Setup What I want to do is to connect A to Bs private network 10.A.B.x I tried this manual but had no luck. So A has a vpn address 10.9.0.10, B's vpn address is 10.9.0.6 and B's private network is 10.20.20.0/24. When at the Server I try to make a route to Bs private network like this sudo route add 10.20.20.0 netmask 255.255.255.0 gw 10.9.0.6 dev tun0 it says "route: netmask 000000ff doesn't make sense with host route" but I don't know how to tell Server to look for a private network in a different way. Do you know how can I make it right ?

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• Apache Server with memcache, varnish and php slow request times

  - by coolestdude1

  My issue is that these servers are taking rather long for request about 2 seconds on average just to serve files. When we had just one server doing everything it was noticeably faster even with the same web app (Drupal 6 and Drupal 7). I want to get this number down to a reasonable level and so I need some help getting to the bottom of why the request times are so slow. This can cause the webapp to hang on post or put and generally leads to a bad user experience on my sites. PS: I am more of a server newbie so this has confounded me for quite some time. The domains: collabornation.net nptrainingworks.com (they run off the same two webservers using vhost configs) The Gear: Two Rackspace 4 Gig servers running CentOS 6.2 Final They have a mounted file system (gluster) that is used to keep files the same on both machines. They are behind a rackspace load balancer running round robin. Mysql is run using php-pdo and php-mysql as such mysql is run on another instance running memcache on that machine with phpMyAdmin located there as well. Apache version number 2.2.15-15.el6.centos.1 (httpd.x86_64) Varnish version number 3.0.2-1.el5 (varnish.x86_64) PHP version number 5.3.14-1.el6.remi (php.x86_64) Configs Linked Below Apache Conf Vhost Conf Varnish Backends Varnish Defaults Varnish Acl PHP INI Again need some help, much appreciated!

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• Securing NTP: which method to use?

  - by Harry

  Can someone good at NTP configuration please share which method is the best/easiest to implement a secure, tamper-proof version of NTP? Here are some difficulties... I don't have the luxury of having my own stratum 0 time source, so must rely on external time servers. Should I read up on the AutoKey method or should I try to go the MD5 route? Based on what I know about symmetric cryptography, it seems that the MD5 method relies on a pre-agreed set of keys (symmetric cryptography) between the client and the server, and, so, is prone to man-in-the-middle attack. AutoKey, on the other hand, does not appear to work behind a NAT or a masquerading host. Is this still true, by the way? (This reference link is dated 2004, so I'm not sure what is the state of art today.) 4.1 Are public AutoKey-talking time servers available? I browsed through the NTP book by David Mills. The book looks excellent in a way (coming from the NTP creator after all), but the information therein is also overwhelming. I just need to first configure a secure version of NTP and then may be later worry about its architectural and engineering underpinnings. Can someone please wade me through these drowning NTP waters? Don't necessarily need a working config from you, just info on which NTP mode/config to try and may be also a public time server that supports that mode/config. Many thanks, /HS

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• Port(s) not forwarding?

  - by user11189

  I have cable internet service through Charter Communications and feed two desktop computers through a Linksys RP614v3 router. One system is my wife's running WinXP Home Edition and the other is mine, running Vista Home Premium (sp1). I have port forwarding configured in the Linksys so I can access the Vista system remotely using TightVNC. Initially, it worked great and I was able to remotely tend email and access local files while out of town for work. Lately, the cable internet service appears to flicker intermittently and upon return, my Mailwasher program loses ability to access the net and I've been unable to make the remote connection. When I reset the port forwarded for email in the router control panel, Mailwasher functionality returns but as I'm home when that happens, I have no easy way to check remote access until the next time I'm on the road or at work. I'm at my wit's end -- the TightVNC client accesses fine from my wife's system from behind the modem/router setup but I don't know how to maintain whatever gets reset when I fiddle with the control panel and the need to do so at all is new. I accessed it fine for a week off and on while out of town a month ago and now I can't leave home and access it from work an hour later.

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• How to secure a group of Amazon EC2 instances

  - by ks78

  I have several Amazon EC2 instances running Ubuntu 10.04 and I've recently started using Amazon's Route 53 as my DNS. The purpose of doing that was to allow the instances to refer to each other by name rather than private IP (which can change). I've pointed my domain name (via GoDaddy) to Amazon's name servers, allowing me to access my EC2 webservers. However, I noticed I can now access the EC2 instances which I don't want to be public, such as the dedicated MySQL Server. I was thinking Amazon's Security Groups would still be in effect when using Route 53, but that doesn't seem to be the case. Before I started using Route 53, I was thinking of having one instance run a reverse proxy, which would help protect the web servers behind it. Then IP-restrict all the other instances. I know IP restricting can be done using the firewall within each instance, but should I ever need to access them from another IP address, I'd need a way in. Amazon's control panel made it a breeze to open a port when necessary. Does anyone have any suggestions for keeping EC2 instances secure, but also accessible to their administrator? Also, what's the best topology for a group of EC2 instances, consisting of web servers and a dedicated database server, from a security perspective? Does having a reverse proxy server even make sense?

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• Diagnosing Random Network Lag

  - by uesp

  I'm having trouble diagnosing some random lag on a 6 server LAMP cluster serving a MediaWiki site. While we're serving some 100 pages/sec the servers themselves are running fine with less than 0.5 load, no locked processes, no paging, no errors being logged, etc.... Lag is present on all servers and is random: one minute its fine the next it's there. DNS lookups on the servers are randomly slow. For example time nslookup google.com varies randomly from a few milliseconds to several seconds and sometimes times out entirely. While we use IP addresses internally on the cluster this may be a symptom of the root issue. We are not running our own DNS server. The Apache server-status pages randomly lag or time out. Benchmarking using ab between servers shows a few loads sometimes take 3000 ms (almost exactly). Benchmarking server-status on the local server itself usually shows no issue (it showed a lag only once among a few hundred tests). The servers are sitting behind a switch and a firewall which I don't have any access to so I don't know their setup or status. While we are under heavier than normal load a 2 Mbps incoming and 20 Mbps outgoing traffic shouldn't be stressing the switch or firewall should it? My feeling is that it is the switch/firewall or something above them in the ISP like their DNS but can't confirm it. I need some other tests or methods of diagnosing this lag to try and narrow down the ultimate cause.

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• Local user vs. domain user? What is the right way here?

  - by ebeeb

  I'm a software developer in a company with 6 employees. Everyone has a machine for him-/herself, so none of the machines is shared. I'm currently setting up my machine with Windows 8 and was experimenting a bit with domain and local user accounts. Correct me please if I'm wrong, but I think the idea behind is, that domain users generally should not be able to modify the configuration of a machine (like installing software), since they are able to login on every single machine in the domain. The local user (usually just one local administrator per machine) is the one who cares about the configuration of the machine. But in my case the login into the domain is just for being able to access directories/servers in the domain (I do not really know the details, all I know is, that loggin into the domain user account is necessary). So overall I've got a local admin account and a domain account used on my machine. While working I'm logged in to my domain user account. But it annoys me, that I always need to enter the credentials of my local user account when I'm about to update/install something, which happens quite often as a software developer. I fixed this with adding the domain account into the user accounts in my control panel and putting it into the Administrators group. The only thing I wanted to know about this: is there something REALLY bad about doing this? Or is there maybe a more common way to be able to act like a local admin, while logged in as a domain user? PS: I'm sorry about the tags, but I don't know the proper ones. I'd be glad if some of the superuser experts could fix this :-)

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• How to always show titles on Windows 7 Taskbar thumbail preview?

  - by Cooper

  I often use the Win+n shortcuts to 'alt-tab' between windows of pinned application (i.e. Win+2 to basically 'alt-tab' multiple putty windows, where putty is pinned as app #2 on the taskbar). The Win+n always pops up the thumbnail previews of all the windows, but sometimes it shows window titles above the thumbnail, sometimes it doesn't. Is there any way to always show the titles (i.e. registry setting?)? For putty sessions this would be especially nice, as the title contains the hostname, and the thumbnail is too small to determine what host that window is for. I've noticed that the titles usually show up with there are more than ~4-6 windows of that pinned item open - but the number seems to vary - is there a threshold setting for this? Update: So I just noticed the titles show up whenever the taskbar buttons combine, which varies based on how many windows from other apps are open... So I'm now looking for a way to combine buttons (but I'd like to keep labels, so the options in the 'Taskbar and Start Menu Properties' are close, but probably finding the registry settings behind should do it.

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• Vista: window focus problem

  - by GateKiller

  Sorry for the vague title but this one is hard to explain so bear with me please. I'm using Windows Vista at work for web development and sometimes when I Click or Alt-Tab to background window, the window will get focus but it will not be brought to the front. In order to bring the window to the front, I have to click on the applications border (when the resize cursor appears) and the window will then jump to the front. I've had this problem for about a year now and it happens at least a dozen times a day, but it doesn't do this all the time - seems random. I hope I have explained the issue fully (and you've understood it) and would appreciate any constructive answers or comments to solve this problem. Example: If I Alt-Tab from Google Chrome to Notepad and this problem randomly occurs, Google Chrome will remain in front of Notepad, however, I will be able to type text into Notepad while the window is behind Google Chrome. Clicking on Notepad's content area will not bring it to the front but clicking it's window border will. Video Exampe http://vimeo.com/19388998 In this video, I clicked from Google Chome to UltraEdit and chrome stayed in font, but as you can see, I can still type in UltraEdit. I'm starting to believe that this could be a bug in Google Chrome so I'll continue to watch if this between other applications.

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• Why does Google Analytics use two domains?

  - by AKeller

  I'm building a distributed widget that is comparable to Google Analytics. Users will add a <script> tag to their site that references my widget's JavaScript file. The Google Analytics tracking code looks like this: var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-XXXXXXXX-X']); _gaq.push(['_trackPageview']); (function () { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Can anyone explain the reasoning behind separate HTTP and HTTPS hostnames? My instinct is to just secure the www address and then use the protocol-less syntax, like //www.google-analytics.com/ga.js. But I'm sure the Google Analytics architects put a lot of thought into this approach. I'd love to understand their logic before I follow/ignore their model.

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• Can a website see/know my MAC address even if I use a VPN?

  - by ilhan

  I have searched other results and read many of them but I could not get an enough information. My question is that can a website see my MAC address or can they have an information about that I'm the same person under these conditions: I am using a VPN and I use two IPs: first one is normal one, the second one is the VPN's IP. I use two browsers to hide behind browser fingerprinting. I use both browsers with Incognito Mode. I always use one for normal IP, one for the VPN IP. I do not know that if the website uses cookies or not. But can they collect an enough information to prove that these two identities belong to same person? Is there any other way for them to see that I am the same person? I use different IPs, different browsers and I use both browsers in incognito mode. I even changed one of browsers language to only English. So even if they collect my info from browser, they will see two browsers using different languages. (Addition after edit): So I have changed my IP and browser information and the website can not reach this information anymore to prove that I am the same person using two accounts. Then let's come to the title: Can they see my MAC address? Because I think that it is the last way that they can identify me and my main question is that. I wrote the information above to mention that I changed IPs and I have some precautions to avoid browser fingerprinting (btw my VPN provider already has a service about blocking it). I wrote them because I read similar advices in some related questions but my question is that can they see my MAC address (or anything else that can make me detected) despite all these precautions. And lastly, Is there an extra way to be anonymized that I can do? For example, can my system clock or anything else give an information? Thanks in advance.

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• Exporting only visible datagridview columns to excel

  - by Suresh E

  Need help on exporting only visible DataGridView columns to excel, I have this code for hiding columns in DataGridView. this.dg1.Columns[0].Visible = false; And then I have button click event for exporting to excel. // creating Excel Application Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel._Application(); // creating new WorkBook within Excel application Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing); // creating new Excelsheet in workbook Microsoft.Office.Interop.Excel._Worksheet worksheet = null; // see the excel sheet behind the program app.Visible = true; // get the reference of first sheet. By default its name is Sheet1. // store its reference to worksheet worksheet = workbook.Sheets["Sheet1"]; worksheet = workbook.ActiveSheet; // changing the name of active sheet worksheet.Name = "PIN korisnici"; // storing header part in Excel for (int i = 1; i < dg1.Columns.Count + 1; i++) { worksheet.Cells[1, i] = dg1.Columns[i - 1].HeaderText; } // storing Each row and column value to excel sheet for (int i = 0; i < dg1.Rows.Count - 1; i++) { for (int j = 0; j < dg1.Columns.Count; j++) { worksheet.Cells[i + 2, j + 1] = dg1.Rows[i].Cells[j].Value.ToString(); } } but I want to export only visible columns, while I get all of them, anyone, help on this.

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• debian lenny email server

  - by Dal

  Hi I am a newbie and set up a debian lenny at home and set up the web and email server in the default installation. I followed the instructions for Exim and ran dpkg-reconfigure exim4-config and set it up for mydomainhere.com. I created a one line message file and attempted to test exim by running the command exim [email protected] < msgfile. I also tried using exim4 Exim but i get same error -bash: Exim: command not found. Obviously I am ignorant on how to run exim and test. I also tried to run a php file that sends a test mail and had no success. That script is tested and works fine if I send it from my hosting isp on a different domain. So I know the php script is good. I set up the debian system behind a netgear firewall and uses 192.168.1.x ip . The web server works great and users can visit my site. But I am lack the knowledge on how to get the email working. Appreciate is someone can guide me.

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• TCP/UDP hole punching from and to the same NAT network

  - by Luc

  I was wondering if tcp/udp hole punching would still work when you are in the same network (behind a NAT), and what the packet's path would be. What happens when using hole punching on the same network, is that it will send a packet out with the same destination and source address. Only the source and destination port would differ. I imagine a router with NAT loopback enabled will handle this as it should, but how about other routers? Would they drop the packet, or would a router (the first?) from the ISP bounce the packet back after which it gets handled okay? I'm wondering because I was thinking about using this technique to circumvent a block between peers in a network (like a school network where clients can only access the internet, but any contact with each other is blocked). The only other option is to use a man in the middle as proxy (tunnel?). The disadvantage of this is that you have to have a server with significantly more bandwidth than one that would only do hole punching. Also the latency would increase significantly.

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• Reverse SSH tunnel: how can I send my port number to the server?

  - by Tom

  I have two machines, Client and Server. Client (who is behind a corporate firewall) opens a reverse SSH tunnel to Server, which has a publicly-accessible IP address, using this command: ssh -nNT -R0:localhost:2222 [email protected] In OpenSSH 5.3+, the 0 occurring just after the -R means "pick an available port" rather than explicitly calling for one. The reason I'm doing this is because I don't want to pick a port that's already in use. In truth, there are actually many Clients out there that need to set up similar tunnels. The problem at this point is that the server does not know which Client is which. If we want to connect back to one of these Clients (via localhost) then how do we know which port refers to which client? I'm aware that ssh reports the port number to the command line when used in the above manner. However, I'd also like to use autossh to keep the sessions alive. autossh runs its child process via fork/exec, presumably, so that the output of the actual ssh command is lost in the ether. Furthermore, I can't think of any other way to get the remote port from Client. Thus, I'm wondering if there is a way to determine this port on Server. One idea I have is to somehow use /etc/sshrc, which is supposedly a script that runs for every connection. However, I don't know how one would get the pertinent information here (perhaps the PID of the particular sshd process handling that connection?) I'd love some pointers. Thanks!

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