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• How do you add a domain name to a VPS?

  - by jasonaburton

  Hi all, I have a VPS with allgamer.net (I use it to play minecraft). I also have a domain name with networksolutions.com What I want to do is attach that domain name to the VPS. I want to run a wiki on my domain name. If this is possible I can avoid buying another hosting plan just for the wiki. How do I go about doing this? I have very little knowledge in server administration so any advice you guys have is greatly appreciated! I'm pretty sure I have to change the DNS in my domain name to the DNS for my VPS, but on allgamer.net's interface there is no discernable place to find out what I need to change it to. Is there a way to find out the DNS via SSH on my VPS? As well, when I first got my VPS with allgamer.net I filled out a form for it with all my information, but they also wanted a domain name along with it. I gave them the domain name I currently own, but for some reason, it's like it's not connected to the VPS, like if I go to mydomain.com there's nothing, as well, if I use mydomain.com for my minecraft server, it also doesn't work. It's as if it's serving no purpose by being "attached" to my VPS. Any insights into this? Thanks for any help you guys can give me.

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• How do I keep a table up to date across 4 db's to be used in SQL Replication Filtering?

  - by Refracted Paladin

  I have a Win Form, Data Entry, application that uses 4 seperate Data Bases. This is an occasionally connected app that uses Merge Replication (SQL 2005) to stay in Sync. This is working just fine. The next hurdle I am trying to tackle is adding Filters to my Publications. Right now we are replicating 70mbs, compressed, to each of our 150 subscribers when, truthfully, they only need a tiny fraction of that. Using Filters I am able to accomplish this(see code below) but I had to make a mapping table in order to do so. This mapping table consists of 3 columns. A PrimaryID(Guid), WorkerName(varchar), and ClientID(int). The problem is I need this table present in all FOUR Databases in order to use it for the filter since, to my knowledge, views or cross-db query's are not allowed in a Filter Statement. What are my options? Seems like I would set it up to be maintained in 1 Database and then use Triggers to keep it updated in the other 3 Databases. In order to be a part of the Filter I have to include that table in the Replication Set so how do I flag it appropriately. Is there a better way, altogether? SELECT <published_columns> FROM [dbo].[tblPlan] WHERE [ClientID] IN (select ClientID from [dbo].[tblWorkerOwnership] where WorkerID = SUSER_SNAME()) Which allows you to chain together Filters, this next one is below the first one so it only pulls from the first's Filtered Set. SELECT <published_columns> FROM [dbo].[tblPlan] INNER JOIN [dbo].[tblHealthAssessmentReview] ON [tblPlan].[PlanID] = [tblHealthAssessmentReview].[PlanID] P.S. - I know how illogical the DB structure sounds. I didn't make it. I inherited it and was then told to make it a "disconnected app."

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• PHP/Linux File Permissions

  - by user1733435

  May I ask a question about file permission. I set up Ubuntu server where Apache got running. I have simple php upload form and able to upload file to /var/www/site/uploads as follows. sandbox@sandbox-virtual-machine:/var/www/site/uploads$ ll total 1736 drwxrwxrwx 2 www-data www-data 4096 Oct 18 02:53 ./ drwxrwxrwx 3 sandbox sandbox 4096 Oct 18 00:42 ../ -rw-r--r-- 1 www-data www-data 145998 Oct 18 02:53 3d wallpaper pic.jpg -rw-r--r-- 1 www-data www-data 166947 Oct 18 02:53 3D Wallpapers 9.jpg -rw-r--r-- 1 www-data www-data 1451489 Oct 18 02:53 6453_3d_landscape_hd_wallpapers_green.jpg Is there anyway to upload files and they show up as -rw-r--r-- 1 sandbox sandbox 145998 Oct 18 02:53 3d wallpaper pic.jpg -rw-r--r-- 1 sandbox sandbox 166947 Oct 18 02:53 3D Wallpapers 9.jpg -rw-r--r-- 1 sandbox sandbox 1451489 Oct 18 02:53 6453_3d_landscape_hd_wallpapers_green.jpg so that I could straight away feed them to waiting/running shell script. Right now waiting script(move,checksums,rename,resize,etc) unable to do anything to uploaded files with attributes of www-data. If I just do as local account, such as sandbox@sandbox-virtual-machine:/var/www/site/uploads$touch testfile then the script is able to run as I would like to. Any suggestion would be grateful,thanks in advance as well. Thanks for everyone giving help to me,that I was able to progress. Now I am close to getting solved and append the output sandbox@sandbox-virtual-machine:/var/www/site/uploads$ ll total 388 drwxrwxrwx 2 www-data www-data 4096 Oct 18 04:22 ./ drwxrwxrwx 3 sandbox sandbox 4096 Oct 18 04:17 ../ -rw-r--r-- 1 sandbox sandbox 166947 Oct 18 04:21 3D Wallpapers 9.jpg -rw-r--r-- 1 sandbox sandbox 219808 Oct 18 04:20 adafruit_pi.png -rw-rw-r-- 1 sandbox sandbox 0 Oct 18 04:22 test How may I set permission to uploaded files like 'test' only w difference in middle group. Such as adafruit_pi.png Vs test. Which statement shall I insert to php code,please?

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• How can I view the binary contents of a file natively in Windows 7? (Is it possible.)

  - by Shannon Severance

  I have a file, a little bigger than 500MB, that is causing some problems. I believe the issue is in the end of line (EOL) convention used. I would like to look at the file in its uninterpreted raw form (1) to confirm the EOL convention of the file. How can I view the "binary" of a file using something built in to Windows 7? I would prefer to avoid having to download anything additional. (1) My coworker and I opened the file in text editors, and they show the lines as one would expect. But both text editors will open files with different EOL conventions and interpret them automagically. (TextEdit and Emacs 24.2. For Emacs I had created a second file with just the first 4K bytes using head -c4096 on a linux box and opened that from my windows box. I attempted to use hexl-mode in Emacs, but when I went to hexl-mode and back to text-mode, the contents of the buffer had changed, adding a visible ^M to the end of each line, so I'm not trusting that at the moment. I believe the issue may be in the end of line character(s) used. The editors my coworker and I tried (1) just automagically recognized the end of line convention and showed us lines. And based on other evidence I believe the EOL convention is carriage return only. (2) return only. are able to recognize and To know what is actually in the file, I would like to look at the binary contents of the file, or at least a couple thousand bytes of the file, preferablely in Hex, though I could work with decimal or octal. Just ones an zeros would be pretty rough to look at.

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• How to Move SMS from iPhone to Mac?

  - by seda16

  SMS is the main form to Communicate with others, you would saved many messages on your iPhone. Well, there're many reasons you need to backup your iPhone sms to the Mac. For example, your family or friends have sent you some important and you want to save them on your iPhone in case you delete them by accident, or you just need to backup your sms for other use. So today let's talk about how to move sms from iPhone to Mac. It would be very easy if you use an app to help you, I always use the iPhone to Mac transfer on Amacsoft to copy sms from iPhone to Mac. Now let me tell you how to use this great app: Step 1:Connect iPhone to Mac First of all, you need to install and launch the iPhone to Mac transfer, then connect your iPhone to Mac. The iPhone to Mac transfer would recognise your iPhone automatically. And all information of your iPhone will be shown on an interface. Step 2:Select sms and Start the Export Now you can see many choice on the left, find "SMS" and click it, all sms on your iPhone will be listed on the right. Select and check those you want to move, then just click "Export" on the top to start the transfer. Wait just a few a minute the transfer will be done. Great! You have finish the transfer now, it's really very easy, right? I believe it won't be a problem if you want to transfer your sms from iPhone to Mac. By the way you can also use this Amacsoft iPhone to Mac transfer to move other kind of files , like photos, songs etc. If you're a windows user, you can use iPhone to PC transfer on this web to move sms from iPhone to your PC just with the same steps, good luck!

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• Ubuntu 12.4 compiz - disable all compiz plugin - empty screen

  - by gotqn

  A friend of mine has installed on my new machine Ubuntu 10.4 (I have always been windows user and have no experience with Linux). I started to watch some tutorial about how to make 'Rotated Cube' using 'Compiz',but the cube appears in the form of a list (only two slides). I have thought this could be result of my video cards (only two - one from the processor and one from the motherboard) and they can not support this options. Anyway, I have decided to disable all compiz plugins and options because my friend has set some, and I started to think there is some misunderstanding between the plugins. After, that I got only empty screen(no menu, no icons, anything) and can do nothing. How to fix this? EDIT: When I remove the compiz stuffs (from the console), the menu is shown again. Then I install the compiz again (some of the effect are still not working). After restart or log out/in the menu is hidden again. I suppose that there are some settings that I've broken but they are saved somewhere in the system and remove the compiz do not deleted them and as a result they are activated after compiz is installed again and the PC is restarted?

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• Getting Server 2008 R2 to ignore all traffic from Internet-facing NIC, leaving it to a VM

  - by Wolvenmoon

  I got in to Server 2008 R2 via Dreamspark and would like to start learning on it. I don't have much option but to put it on a system sitting between the Internet and my home LAN due to electricity bills and the fact that 3 computers in an 11x11 space in 102 degree weather is pretty stygian. Currently I use a ClearOS gateway to manage everything, what I'd like to do is take my server 2008 R2 box, which has two NICs, and drop it at the head of my network. I'd want Server 2008 R2 to ignore all traffic on the external facing NIC and pass it to a virtual ClearOS gateway, and to put all its Internet traffic through its other NIC - which will face the rest of my network and be the default gateway for it. The theory is to keep the potentially vulnerable Server 2008 R2 install as tucked behind a Linux box as possible, without sacrificing too much performance. This is a home network that occasionally hosts dedicated game servers and voice chat servers, so most malicious activity is in the form of drive by non-targeted attacks, however, I don't trust Windows Server because I don't know the OS well enough, yet. So, three questions: How do I do this, am I going to be reasonably more secure doing this than if I just let the Server 2008 R2 rig handle all the network traffic and DHCP (not an option), and should I virtualize the Server 2008 R2 rig instead and if so in what? (Core 2 Duo e6600 w/ 5 gigs usable RAM)

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• How to remove that extra text from URL titles in Firefox browser?

  - by amar

  I am using Firefox with Vimperator. On Mac I use Shiori to bookmark. I also use Pinboard's default add-on (on both Mac and Windows, but mainly on Windows as there's no Shiori). When I used to bookmark, I had this behaviour[A] (before changing Vimperator options): Example: URL: xyz.com TITLE: xyz website Pinboard add-on would fetch the title as xyz website which was fine (I reckon it directly fetches TITLE form the URL). But after installing and starting to use Shiori the title I was getting in its "title" field was xyz website - Vimperator exactly the same what I could see in tabs (seems it's getting what the browser is feeding it). So, I :set titlestring= in Vimperator to remove that extra Vimperator from title. Now, this is what I am getting [B]: When I try to bookmark using Pinboard add-on the title is undefined Using Shiori it results in xyz website - undefined. I tried to change it back to original[C] :set titlestring=Mozilla Firefox (assuming this was the original, before Vimperator) but the results are still the same as [B]. How to get read of that extra - undefined or that extra - Vimperator or - Mozilla Firefox for that matter, while bookmarking pages either with Pinboard add-on or Shiori? One workaround is, instead of no string just add a white-space while setting title in Firefox via Vimperator there but that results in - appended to titles.

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• PNP4Nagios, nagiosgraph, separate Cacti, or something else for Nagios trending.

  - by Matt

  I've been using Nagios for a while now and recently started using Cacti after being dissatisfied with the lack of scaling and lack of any GUI in MRTG. I'm interested in adding trending to my Nagios installation and wondered what was the best route to go. I've looked around a bit and have seen what's available, but there's not a lot of information around to differentiate them from each other. My Nagios install has about 250 hosts and 1100 service checks, but many of them are just simple network devices and there's only about 20 servers and 300 services associated with them. All servers but 2 are running Windows Server 2003. What are the main highlights of PNP4Nagios vs. nagiosgraph, or would I be better off using some sort of tool to convert the data to RRD form and just view it directly in Cacti? Is there a completely different direction I could go that would be even better? Please comment if you need any more information, I tend to be too wordy and tried to keep this question brief. Thanks!

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• GRE Tunnel over IPsec with Loopback

  - by Alek

  I'm having a really hard time trying to estabilish a VPN connection using a GRE over IPsec tunnel. The problem is that it involves some sort of "loopback" connection which I don't understand -- let alone be able to configure --, and the only help I could find is related to configuring Cisco routers. My network is composed of a router and a single host running Debian Linux. My task is to create a GRE tunnel over an IPsec infrastructure, which is particularly intended to route multicast traffic between my network, which I am allowed to configure, and a remote network, for which I only bear a form containing some setup information (IP addresses and phase information for IPsec). For now it suffices to estabilish a communication between this single host and the remote network, but in the future it will be desirable for the traffic to be routed to other machines on my network. As I said this GRE tunnel involves a "loopback" connection which I have no idea of how to configure. From my previous understanding, a loopback connection is simply a local pseudo-device used mostly for testing purposes, but in this context it might be something more specific that I do not have the knowledge of. I have managed to properly estabilish the IPsec communication using racoon and ipsec-tools, and I believe I'm familiar with the creation of tunnels and addition of addresses to interfaces using ip, so the focus is on the GRE step. The worst part is that the remote peers do not respond to ping requests and the debugging of the general setup is very difficult due to the encrypted nature of the traffic. There are two pairs of IP addresses involved: one pair for the GRE tunnel peer-to-peer connection and one pair for the "loopback" part. There is also an IP range involved, which is supposed to be the final IP addresses for the hosts inside the VPN. My question is: how (or if) can this setup be done? Do I need some special software or another daemon, or does the Linux kernel handle every aspect of the GRE/IPsec tunneling? Please inform me if any extra information could be useful. Any help is greatly appreciated.

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• different nmap results

  - by aasasas

  Hello I have a scan on my server form outside and from inside, why results are different? [root@xxx ~]# nmap -sV -p 0-65535 localhost Starting Nmap 5.51 ( http://nmap.org ) at 2011-02-16 07:59 MSK Nmap scan report for localhost (127.0.0.1) Host is up (0.000015s latency). rDNS record for 127.0.0.1: localhost.localdomain Not shown: 65534 closed ports PORT STATE SERVICE VERSION 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 80/tcp open http Apache httpd 2.2.3 ((CentOS)) Service detection performed. Please report any incorrect results at http://nmap.org/submit/ . Nmap done: 1 IP address (1 host up) scanned in 7.99 seconds AND sh-3.2# nmap -sV -p 0-65535 xxx.com Starting Nmap 5.51 ( http://nmap.org ) at 2011-02-16 00:01 EST Warning: Unable to open interface vmnet1 -- skipping it. Warning: Unable to open interface vmnet8 -- skipping it. Stats: 0:07:49 elapsed; 0 hosts completed (1 up), 1 undergoing SYN Stealth Scan SYN Stealth Scan Timing: About 36.92% done; ETC: 00:22 (0:13:21 remaining) Stats: 0:22:05 elapsed; 0 hosts completed (1 up), 1 undergoing Service Scan Service scan Timing: About 75.00% done; ETC: 00:23 (0:00:02 remaining) Nmap scan report for xxx.com (x.x.x.x) Host is up (0.22s latency). Not shown: 65528 closed ports PORT STATE SERVICE VERSION 21/tcp open tcpwrapped 22/tcp open ssh OpenSSH 4.3 (protocol 2.0) 25/tcp open tcpwrapped 80/tcp open http Apache httpd 2.2.3 ((CentOS)) 110/tcp open tcpwrapped 143/tcp open tcpwrapped 443/tcp open tcpwrapped 8080/tcp open http-proxy?

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• How Could My Website Be Hacked

  - by Kiewic

  Hi! I wonder how this could happen. Someone delete my index.php files from all my domains and puts his own index.php files with the next message: Hacked by Z4i0n - Fatal Error - 2009 [Fatal Error Group Br] Site desfigurado por Z4i0n Somos: Elemento_pcx - s4r4d0 - Z4i0n - Belive Gr33tz: W4n73d - M4v3rick - Observing - MLK - l3nd4 - Soul_Fly 2009 My domain has many subdomains, but only the subdomains that can be accessed with an specific user were hacked, the rest weren't affected. I assumed that someone entered through SSH, because some of these subdomains are empty and Google doesn't know about them. But I checked the access log using the last command, but this didn't show any activity through SSH or FTP the day of the attack neither seven days before. Does anybody has an idea? I already changed my passwords. What do you recommend me to do? UPDATE My website is hosted at Dreamhost. I suppose they have the latest patches installed. But, while I was looking how they entered to my server, I found weird things. In one of my subdomains, there were many scripts for execute commands on the server, upload files, send mass emails and display compromising information. These files had been created since last December!! I have deleted those files and I'm looking for more malicious files. Maybe the security hold is an old and forgotten PHP application. This application has a file upload form protected by a password system based on sessions. One of the malicious scripts was in the uploads directory. This doesn't seem like an SQL Injection attack. Thanks for your help.

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• Recommendation for Document Management Solution

  - by BillN

  We've just been informed by our software vendor that the custom document management system they'd written is no longer in development, and will not be supported in the future. So we are looking at new document management systems. Requirements: Multiple input vectors, we receive documents via e-mail, fax, scanning, and from the originating application Ability to Redact or obscure data. Customers may fax an order with CC data, we want to attach the image of the order form with the order record, but the CC data needs to be protected. Same with Tax IDs. Certain users should be able to see the redacted data, but access should be logged. Version control on documents. We'd like Product Development and Marketing to be able to track various versions of documents like Packaging Designs, but ensure that users have the latest approved version. AD integration, my users don't need another password. Ability to integrate to other apps. Our current system, offers function keys in the order-entry system, that will spawn the viewer application, and open the correct document. Mass import facility, we have a half a terabyte of existing documents in the old system that we would like to import. Retention Policy. I'd like a way to have the system comply with the corporate retention policy, so that when a document of a certain type reaches a certain age, it gets deleted, or atleast marked for manual deletion. We are a Windows Server and HP-UX shop. Does anybody have any experience with Document Management systems that they would like to share? Thanks.

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• BGP Multihomed/Multi-location best practice

  - by Tom O'Connor

  We're in the process of designing a new iteration of our network where we improve resilliency by adding a second datacentre. We'll be adding a second datacentre, with an identical configuration of servers as our primary location. To achieve network connectivity, we're looking into a couple of possible methods. See earlier questions http://serverfault.com/questions/86736/best-way-to-improve-resilience and http://serverfault.com/questions/101582/dns-round-robin-failover-and-load-balancing I'm pretty convinced that BGP is the right way to go about this, and this question is not about RRDNS. 1) If we have 2 locations, do we announce the same IP address block from both locations? 2) If we did this, but had a management ssh interface on x.x.x.50 from datacentre A, but it was on x.x.x.150 in datacentre B. What is the best practice mechanism for achieving this? Because if I were nearest to A, then all my traffic would go to x.50, but if i attempted to connect to x.150, I'd not be able to connect, because this address wouldn't be valid at A, but only at B. Is the best solution to announce 2 different netblocks, one at each location, facilitating the need for RRDNS, or to announce a single block, and run some form of VPN between the two sites for managment traffic?

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• Ubuntu 12.04 glusterfs volume failed to mount at boot time

  - by user183394

  I have just setup 7 KVM guests, all running Ubuntu 12.04 LTS 64bit Minimal server to test out glusterfs 3.2.5 from the Ubuntu official repo. Two of them form a mirrored pair (i.e. replica 2), and five of them are clients. I am still new to this file system and would like to gain some "hands-on" experience. The setup was mostly uneventful, until I put in the following into each glusterfs client's /etc/fstab: 192.168.122.120:/testvol /var/local/testvol glusterfs defaults,_netdev 0 0, where 192.168.122.120 is the IP address of the first "glusterfs server". If I issue either a manaul mountall or a mount.glusterfs 192.168.122.120:/testvol /var/local/testvol on CLI, a mount shows that the volume is successfully imported. But once a client is rebooted, after it comes back up, the volume is not mounted! I searched the Internet, and found this article, but since I am not running both client and server on the same node, IMHO it's not strictly applicable. So, as a kludgy "get-around", I put in a sleep 3 && mount.glusterfs 192.168.122.120:/testvol /var/local/testvol into each client node's /etc/rc.local. It seems to be able to get the volume mounted on each node, as far as I can tell. But this is quite ugly, and I would appreciate a hint as to how to resolve this glusterfs-non-boot-time-mounting issue correctly. Note that I used the IP address of the first "glusterfs server" although the /etc/hosts of all nodes have been populated with their hostnames. I figured that the use of IP address is more robust. --Zack

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• Xen guests accessing LUNs

  - by mechcow

  We are using RHEL5.3 with a Clarion SAN attached by FC. Our situation is that we have a number of LUNs presented to Hosts and we want to dynamically present the LUNs to Xen Guests. We are not sure on what the best practice approach is to set this up. The Xen guests will form a cluster together and need the LUNs only for data partitions, i.e. when they are actively running services. So one approach would be to always present all disks to all Xen guests, and then rely up on the cluster software, and mount itself, to not mount the disk twice in two locations. This sounds kinda risky and also is not very secure (one cracked guest can see/destroy all the data). Another approach would be to dynamically add and remove the disks from the Xen guests at the dom0 level (using xm block-attach). This could work but sounds slightly complicated, I'm wondering whether Red Hat Cluster Suite supports this in some way or whether there are scripts to do this. Yet another approach would be to have the LUNs endpointed at the Xen guests themselves - I'm not sure whether this is technically possible since the multipathing has to be done at the Host level.

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• Login to OS X Server User Account from Local Computer

  - by Brod Wilkinson

  I have OS X Server installed on a mac mini. I've created several User accounts, one of which is Account Name: Bob Password: abc123 From the Mac Mini's login screen I can choose "Server" (main account) "Bob" (Bobs account) and "Other..." OS X Server Accounts, from "Other..." if I input Bobs credentials it will log me in. I also have a macbook air, I would like to be able to select from the Login Screen "Other..." input Bobs credentials and have it login to Bobs account, or any other User Account for that matter. My Server is setup as private with the server address: server.network.private Following some googled instructions as well as apples very own instructions I have: Setup an Open Directory with Username: diradmin Password: abc123 Then on the macbook air gone into System Preferences > Users & Groups > Login Options and clicked Join next to Network Account Server, input my server (server.network.private) with diradmin credentials and its connected. Great. I've also ticked Allow Network Users to Login and Login Window and selected All Users. I was assuming this would allow my macbook air to login to the "Bob" account by selecting "Other..." from the login window although there is no "Other..." option. I then setup a VPN, basic credentials, logged into it on the macbook air and still not much has changed. I am able to share screens with the "Bob" account form my macbook air by logging in by clicking Share Screen... from the Finder under Shared > Network Server and then clicking Login In but this obviously requires the macbook air to already be logged into an account before it can share screens which is not suitable. Is there any way to simply login to the OS X Server User Account from the macbook air's login screen via the "Other..." like it does on the mac mini's login screen? Thanks in advance. Operating System: OS X 10.9 Mavericks OS X Server: Version 3

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• Googlebot repeatedly looks for files that aren't on my server

  - by John at CashCommons

  I'm hosting a site for a volunteer organization. I've moved the site to WordPress, but it wasn't always that way. I suspect at one point it was hacked badly. My Apache error log file has grown to 122 kB in just the past 18 hours. The large majority of the errors logged are of this form -- it's repeated hundreds of times today alone in my log files: [Mon Nov 12 18:29:27 2012] [error] [client xx.xxx.xx.xxx] File does not exist: /home/*******/public_html/*******.org/calendar.php [Mon Nov 12 18:29:27 2012] [error] [client xx.xxx.xx.xxx] File does not exist: /home/*******/public_html/*******.org/404.shtml (I verified that xx.xxx.xx.xxx was a Google server.) I suspect there was a security hole somewhere before, likely in calendar.php, that was exploited. The files don't exist anymore, but there may be many backlinks that exist that reference here, hence why googlebot is so interested in crawling them. How do I fix this gracefully? I still would like Google to index the site. I just want to tell it somehow not to look for these files anymore.

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• Help Installing SQL Server 2008 Express Edition

  - by Jordan S

  Ok I am running Windows 7, 64 bit. I cleaned of SQL server 2005 completely off my system leaving only SQL Compact Edition. I went here http://www.microsoft.com/downloads/details.aspx?FamilyID=01af61e6-2f63-4291-bcad-fd500f6027ff&displaylang=en and installed SQL Server 2008 Express Edition Service Pack 1. After the install, under my start bar menu all i have for SQL configuration tools are the Configuration Manager, Error and Usage Reporting and the Install Center. I don't have the SQL Managment Studio. So I went here http://www.microsoft.com/downloads/details.aspx?FamilyID=08e52ac2-1d62-45f6-9a4a-4b76a8564a2b&displaylang=en and downloaded the SQL Server 2008 Management Studio Express but when I try to install it I get a warning says This program has known compatibility issues and that I need to Install SQL Server 2008 Service Pack 1. I thought that is what I installed. So, I tried to continue running the install but I then get an error message that says Invoke or BeginInvoke can not be called on a Form before it is opened... How can I check if Service pack 1 is installed or not? What should I do? Also I rebooted my system and checked for Windows Updates and it says that Windows it up to date.

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• Is it the address bus size or the data bus size that determines "8-bit , 16-bit ,32-bit ,64-bit " systems?

  - by learner

  My simple understanding is as follows. Memory (RAM) is composed of bits, groups of 8 which form bytes, each of which can be addressed ,and hence byte addressable memory. Address Bus stores the location of a byte of memory. If an address bus is of size 32 bits, that means it can hold upto 232 numbers and it hence can refer upto 232 bytes of memory = 4GB of memory and any memory greater than that is useless. Data bus is used to send the value to be written to/read off the memory. If I have a data bus of size 32 bits, it means a maximum of 4 bytes can be written to/read off the memory at a time. I find no relation between this size and the maximum memory size possible. But I read here that: Even though most systems are byte-addressable, it makes sense for the processor to move as much data around as possible. This is done by the data bus, and the size of the data bus is where the names 8-bit system, 16-bit system, 32-bit system, 64-bit system, etc.. come from. When the data bus is 8 bits wide, it can transfer 8 bits in a single memory operation. When the data bus is 32 bits wide (as is most common at the time of writing), at most, 32 bits can be moved in a single memory operation. This says that the size of the data bus is what gives an OS the name, 8bit, 16bit and so on. What is wrong with my understanding?

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• Any chance to extract Windows from recovery DVDs

  - by Pekka

  I have an Acer Tablet PC that came with WIndows XP Tablet PC Edition in the form of three recovery DVDs. Sadly, a mainboard fault put the machine out of business. I have now bought a used one from a different manufacturer that comes without an operating system. The recovery DVDs seem to contain three parts of a Norton Ghost image, and nothing else. The recovery DVD won't even start on a Non-Acer system. I'm a bit miffed because I legally own a Windows XP Tablet PC Edition license that I now can't use on the original machine any more. As far as I know, it's not legal in my jurisdiction for them to bind the license to a certain machine. I want to continue using the operating system on the new machine. Is there any chance of extracting usable Windows XP installation files from that image? How are such image files usually made up? Is there any free software around that can read Norton Ghost images so I can take a peek myself?

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• The physical working paradigm of a signal passing on wire.

  - by smwikipedia

  Hi, This may be more a question of physics, so pardon me if there's any inconvenience. When I study computer networks, I often read something like this in order to represent a signal, we place some voltage on one end of the wire and the other end will detect the voltage and thus the signal. So I am wondering how a signal exactly passes through wire? Here's my current understanding based on my formal knowledge about electronics: First we need a close circuit to constrain/hold the electronic field. When we place a voltage at somewhere A of the circuit, electronic field will start to build up within the circuit medium, this process should be as fast as light speed. And as the electronic field is being built up, the electrons within the circuit medium are moved, and thus electronic current occurs, and once the electronic current is strong enough to be detected at somewhere else B on the complete circuit, then B knows about what has happend at A and thus communication between A and B is achieved. The above is only talking about the process of sending a single voltage through wire. If there's a bitstream and we need to send a series of voltages, I am not sure which of the following is true: The 2nd voltage should only be sent from A after the 1st voltage has been detected at B, the time interval is time needed to stimulate the electronic field in the medium and form a detectable electronic current at B. Several different voltages could be sent on wire one by one, different electronic current values will exists along the wire simutaneously and arrive at B successively. I hope I made myself clear and someone else has ever pondered this question. (I tag this question with network cause I don't know if there's a better option.) Thanks, Sam

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• PostgreSQL lots of large Arrays and Writes

  - by strife911

  Hi, I am running a python program that spawns 8 threads and as each thread launch its own postmaster process via psycopg2. This is to maximize the use of my CPU-cores (8). Each thread call a series of SQL Functions. Most of these functions go through many thousands of rows each associated to a large FLOAT8[] Array (250-300) values by using unnest() and multiplying each FLOAT8 by an another FLOAT8 associated to each row. This Array approach minimized the size of the Indexes and the Tables. The Function ends with an Insert into another Table of a row of the same form (pk INT4, array FLOAT8[]). Some SQL Functions called by python will Update a row of these kind of Tables (with large Arrays). Now I currently have configured PostgreSQL to use most of the memory for cache (effective_cache_size of 57 GB I think) and only a small amount of it for shared memory (1GB I think). First, I was wondering what the difference between Cache and Shared memory was in regards to PostgreSQL (and my application). What I have noticed is that only about 20-40% of my total CPU processing power is used during the most Read intensive parts of the application (Select unnest(array) etc). So secondly, I was wondering what I could do to improve this so that 100% of the CPU is used. Based on my observations, it does not seem to have anything to do with python or its GIL. Thanks

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• NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use

  - by Francesco

  I have an issue with sendmail on my server (ubuntu 12.10) with php, mysql,and wordpress installed. Basically I want to create a contact form in my blog to receive emails from visitors directly into my gmail account but it doest work! I created a php file called testmail.php to recall it from the browser: <?php $to = '[email protected]'; $subbject = 'TEST MAIL'; $msg = 'test test test test test test test test test test test test test test test'; $isMailed = mail($to, $subbject, $msg, 'From:me <[email protected]>'); if($isMailed) echo 'mail has been send to: ' . $to; else echo 'mail has NOT been send..'; ?> But I dont receive anything! The /var/log/mail.log says: NOQUEUE: SYSERR(root): opendaemonsocket: daemon MTA-v4: cannot bind: Address already in use What do i do wrong? Where do I need to check? What info do you need more? I checked also into the spam folder, nothing. Thank you!

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• Apache mod_auth_kerb asking 2 authentication

  - by Rianto Wahyudi

  I've configured Apache to use mod_auth_kerberos. So far everything is working nicely for client thats connected to Active Directory and have their browser to ntlm enabled. When clients are not in the domain or the browser configurerd not to authenticate automatically, they are being prompted by 2 login prompt. The first login prompt is blank and the second one is the oen that we configured First Login prompt: http://www.screencast.com/t/ZGNlZTQwZm Second Login prompt : http://www.screencast.com/t/MDA2N2Fl From the log ( first authentication) : [Wed Jan 06 15:47:29 2010] [debug] src/mod_auth_kerb.c(1684): [client x.x.x.x] [pid 2562] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos In the first loging prompt , I can put any text for username and password. Once the first login form submited, it will ask for the 2nd login prompt. Apache have following config : <Directory /web/apache2/htdocs> AllowOverride All AuthType Kerberos AuthName "Staff Access ONLY Kerb-Auth" KrbAuthRealms EXAMPLE.COM Krb5Keytab /etc/httpd/conf.d/example.ktab Allow from localhost Require valid-user <Directory> What could be the cause of the first authentication and how can I get rid of them ?

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