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• Recommended resource to understand Internet conventions IPs, CNAMES, *, MX etc

  - by Petras

  I am a programmer who has been creating websites for many years in shared hosting environments. To make the website live, I logged into where the domain was hosted and updated the name servers. Sometimes I didn’t want POP email so I changed an A record. I never really understood what this meant but it worked. Now we have a dedicated server and I have to fill out all this to make it live: Plus I was told I had to complete zones at my domain host: I would really like to know what all this means. What is a * record What is an @ How does the internet work regarding all these conventions? Is there a good approachable book on this topic?

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• Redundant APC UPS units, single server set up

  - by Sholom

  Hi All We have a very simple set up, looking for a very simple (reliable) solution: Setup: One Dell box with redundant power supplies running Windows 2003, plugged into two separate APC SmartUPS 1500 units (USB, no smart cards) on two separate circuits. Solution required: IF (UPS1 = Low) AND (UPS2 = Low) THEN: Shutdown gracefully ELSE: DO NOTHING!! APCUPSD only allowes for one instance (and therefore one UPS) in a windows environment. PowerChute can't do this without using APC Smart Cards which means utilizing our switch, but the switch does not have redundant power supplies, so it will only live for as long as one of the two UPS units. And no, i don't have the budget to buy two smart cards pluse a switch with redundancy ;) Thanks

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• Port forwarding not working?

  - by rphello101

  I'm trying to set up an Apache Server to be accessed publicly. I'm using a Netgear R4500 router hooked up to a Motorola SB6121 modem. I can access my server on my computer by typing in my IP address. After following the instructions to forward port 80 so I can access the server from other computers, it does not work (see image). I get "This webpage is not available". I am forwarding to the IP address of my computer. Using this Network Port Scanner Tool, it says "80/tcp filtered http", which, as I understand it, means forwarding did not work correctly. In my Apache httpd file, I have: ServerName 192.168.1.13:80 and Listen 192.168.1.13:80 Anyone know what's wrong or have something I can try? click to enlarge

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• nodejs server hanging from time to time

  - by Johann Philipp Strathausen

  I have a node server (0.6.6) running an Express application, along with Mongoose and s3, on an Ubuntu 11.04 machine. Several times per hour, the server is hanging. That means that the application is working fine, I see the express loggings, and then all of a sudden the server stops responding. No errors, no traces, no loggings, and strangely enough the browser won't show the request even in the network debugging window. From any machine in the local network it's the same behaviour. I restart the server and it's okay again for several minutes, then again starts to hang, everytime while doing something different. The same application on Amazon on the same Ubuntu version works fine and never hangs. I know all this is kind of vague, but I don't know where to start. Has any of you seen something like this before? Any idea?

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• SSD install - what do I need to watch out for when reconfiguring SATA ports?

  - by tim11g

  I installed a Samsung 840 SSD in a Windows 7 machine. It seems to be working fine, but I'm not seeing the expected performance. The AS SSD benchmark gives 76 for read and 138 for write. At the upper left of the benchmark it says "pciide - BAD" and "31K - BAD". I'm assuming the "pciide BAD" means the motherboard (Gigabyte GA-P35-DS4) is configured as IDE emulation and needs to change to native SATA. I don't know what the "31K" refers to. The bios settings look like this: I saw this article that indicates that changing the SATA mode of the boot drive can cause problems (Blue Screen): Error message occurs after you change the SATA mode of the boot drive What is the correct procedure to change the SATA Mode without causing a system failure? Apply the registry change from the MSFT article above first, then reboot and change the SATA mode? Will the SATA mode change in the BIOS affect other drives?

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• Google Apps - Can I configure a wildcard MX record and and catch all emai address for a domain

  - by Rohit

  I am using Google Apps Premier Edition. I want to create a disposable email address service and I want to catch all emails for a domain. This means that I should be able to catch all mails sent to an arbitrary userid and/or arbitrary domain and store them into a single Google Apps account. For example, in a single account I want to get all mails sent to: 1) [email protected] 2) [email protected] without requiring to do any extra configuration in Google Apps for abc or xyz. My app will download mails from this account and process accordingly. I have figured out that I could do (1) by specifying a catch all email address. Is the combination of both (1) and (2) possible?

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• can not connect via SSH to a remote Postgresql database

  - by tartox

  I am trying to connect via pgAdmin3 GUI to a Postgresql database on a remote server myHost on port 5432. Server side : I have a Unix myUser that match a postgresql role. pg_hba.conf is : local all all trust host all all 127.0.0.1/32 trust Client side : I open an ssh tunnel : ssh -L 3333:myHost:5432 myUser@myHost I connect to the server via pgAdmin3 ( or via psql -h localhost -p 3333 ). I get the following error message : server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. I have tried to access a specific database with the superuser role using psql -h localhost -p 3333 --dbname=myDB --user=mySuperUser with no more success. What did I forget in the setup ? Thank you

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• iPlanet Authentication provider

  - by Travis

  Good day. I have stepped into project that requires a server migration that would change the means of authentication for our CAC/PKI SSL enabled website. We are using iPlanet 7 and Oracle Directory Server Enterprise 7 as our LDAP server. The situation is that the site is still CAC/PKI enabled, but at the firewall. The information we want to authenticate against is now in the http header. How do I configure iPlanet and LDAP to authenticate against the header instead of SSL? Thanks. Edit, Can this be done with IIS keeping the Directory Server EE LDAP in tact or is the ACL iPlanet only?

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• How can I reduce the CPU usage of Offline Files?

  - by Diego

  Whenever I have the Offline Files service running, there is a constant 25% CPU usage on svchost.exe (this is a quad core, so that means it's using up one core). This, in turn, triples the power consumption and keeps the machine hot... I do have several GB synchronized (music collection), but they are not changing at all, in either side. Am I misusing this feature? Is there anything I can configure to keep it down when there's nothing to do? Or should I forget about it and synchronize big folders manually?

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• Windows vista firewall exceptions unchangeable

  - by user61099

  Hey, I want to allow a program (iTunes) through my windows firewall, so i check it in the program or port list under the exceptions tab (in my windows firewall settings), then i click OK. When i reopen the window the box is unchecked again. Which means i can never get the program through my windows firewall. I think this is a problem due to administrators rights. Because I also can not delete the program from the list. I can however delete other programs from the list. Anybody have any ideas, tips, remarks?

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• Squid throws error, The requested URL could not be retrieved

  - by Supratik

  Sometimes I am getting the following error The requested URL could not be retrieved While trying to retrieve the URL: http://groups.google.com/ The following error was encountered: Unable to determine IP address from host name for groups.google.com The dnsserver returned: Refused: The name server refuses to perform the specified operation. This means that: The cache was not able to resolve the hostname presented in the URL. Check if the address is correct. Your cache administrator is root. What could be the reason for the above error ? Regards Supratik

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• Looking for Team Development type Software like SVN

  - by SoLoGHoST

  I am in need of a software that is PHP-Based, or similar that can be installed on my server that doesn't offer SVN Perks. It should be somewhat similar to an SVN, however, since the server doesn't support SVN, we'll need another means of doing sort of the same thing. We have a team of Developers and need to accomplish progress in the same way that an SVN does, but without that type of server support. Is there any software that could be installed via webhosting that would be somewhat, if not exactly, similar to an SVN? Please help, Thanks :)

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• UDP multicast streaming of media content over WIFI

  - by sajad

  I am using vlc to stream media content over wireless network in scenario like this (from content streamer to stream receiver client): The bandwidth of wireless network is 54 Mb/s and UDP stream's required bandwidth is only 4 Mb/s; however there is trouble in receiving media stream and quality of playing specifically in multicast mode; means I can play the stream but it has jitter and does not play smoothly. In uni-cast I can stream up to 5 media streams correctly, but in multicast mode there is problem with streaming just one media! However when I stream from client some multicast streams; the wifi access-point can receive data correctly and I can see the video in "udp streamer" side correctly even when number of multicast streams increases to 9; But as you see I want to stream from streaming server and receive media in client size. Is this a typical problem of streaming real-time contents over wireless networks? Is it necessary to change configurations of my WIFI switch or it is just a software trouble? thank you

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• SGE: downtime planning

  - by mousee

  I need to plan a downtime for a maintenance of my environment (or some part of my environment) by means of Sun Grid Engine. Is it possible to somehow use backfilling information to tell the grid engine to plan only those jobs on cluster which are able to finish (i have backfilling information) till let's say 10 am next day? Can I then at 10 am rely on the fact that all compute nodes are clean, jobs are only queued, no job is planned and so that I can start maintenance? Thank you for your time. mousee

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• OpenVPN Permission Denied Error

  - by LordCover

  I am setting OpenVPN up, and I'm in the state of adding users. Details: Host System: Windows Server 2003 32-bit. Guest System: Ubuntu Linux (with OpenVPN installed already), actually I downloaded it from OpenVPN.Net. Virtualization: VMWare v7.0 Problem: I can access the Access Server web portal (on the port 5480), but when I login to http://host_ip:943/admin and enter my (correct) login info, it shows me a page saying that "You don't have enough permissions". I am the (root) user!!!! that is really weird!!! Note: if I enter wrong login it will denote an incorrect login, this means that I am logging in successfully but the problem comes after the login process. What I tried: I tried to create another user after (root) logging in to Linux Bash using (useradd) command, but the same resulted.

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• How do i mitigate DDOS attacks on static servers?

  - by acidzombie24

  Here is a slightly different take on DDOS attacks. Rather than a server with dynamic content being attack i was curious how to deal with attacks on servers with STATIC CONTENT. This means cpu tends to not be an issue. Its either bandwidth or connection problems. How would i mitigate a DDOS attack knowing nothing about the attacker (for example country, ip address or anything else). I was wondering is shorting the timeout and increasing amount of connections is an acceptable solution? Or maybe that is completely useless? Also i would limit the amount of connections per IP address. Would the above help or be pointless? Keeping in mind everything is static checking for multiple request of the same page (html, css, js, etc) could be a sign of a attack. What are some measures i can take on a static content server?

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• Video encoding for archival

  - by Jim

  I would like to archive some home videos (DV). I don't need to save them losslessly, but I would like to encode them in something high-quality. What format is both pretty indistinguishable from the original and will likely be readable 15 years from now? WMA makes me nervous, because it's only one company that makes it, and they're constantly coming out with newer formats. (VLC couldn't open my WMAs that Windows Movie Maker made.) Other things I've considered are h.264, Ogg Theora, DivX, and Xvid. I don't mind paying for something, but usually that means the format is owned by only one vendor.

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• MySQL query works in Workbench but gives error code 63 from PHP

  - by smund3

  I am making a poll system with PHP/MySQL and have made created a MySQL user for the system to use. However, whenever I try to run a query from PHP as that user, I get error code 63, which after some Googleing I found out means: OS error code 63: Out of streams resources If I make the PHP script use an almighty user instead, everything works fine, so it looks like it has something to do with permissions. I am using a non-persistent connection. I have Googled a lot but I haven't found anything even slightly relevant to this issue. What could cause this error? EDIT: Now it actually started giving me a different error: OS error code 65: Package not installed ...all I did was revert the script to using the poll user instead of the almighty one.

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• Virtual OS using same Wallpaper as Host

  - by Jeff

  Greetings, I'm running a guest Linux OS on top of Windows XP, which rotates its wallpapers using the PowerToy Wallpaper Changer. I'm hoping for a way for my guest OS to somehow detect which wallpaper the host is using, and automatically switch to it. Why? Because if I run my guest OS in seamless mode and have transparent windows, I want the transparent background to match the host OS. It looks nice that way :). A couple tidbits of relevant information: Guest OS is Peppermint Ice (Ubuntu based) Host OS is Windows XP VirtualBox as virtualization software I realize this is somewhat breaking borders between the host and the guest, but I want my pretty rotating wallpaper! I'm guessing there is a way using scripts and shared folders or something similar, if not by means of just querying the host OS.

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• Google Chrome can't load too many tabs together!

  - by tapan

  This is an annoying problem that I face and friends of mine agree to this too. When using a site like Digg I tend to browse the page and open a lot of tabs simultaneously before reading each tab individually. Now what happens is, when there are 4-5 or more tabs loading up, all of them just stop loading.I can still see that annoying circle rotating (which means it is trying to load) but nothing happens. I have to stop the load and then refresh one tab at a time to see these pages. I never faced these problems on firefox or opera. What can the possible reasons for this be and how do I overcome this issue ? I'm using Ubuntu 10.04 and my Chrome Version is 5.0.375.55. PS: I use the internet from behind a proxy server at my college. I wonder if that could cause these problems. My friends in college also face the same problem.

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• How to customize Windows 7 HAL library during installation (BSOD STOP: 0x000000A5)?

  - by koldovsky

  While trying to install Windows 7 x86 Ultimate on Samsung M40 laptop (Pentium M 1.7 Dothan, 2 GB RAM/ 100 GB HDD) i receive BSOD STOP: 0x000000A5: The bios in this system is not fully ACPI compliant. Please contact your system vendor for an updated bios. The bios on the system is updated to latest version. If ACPI is the real source of the issue it means that I possibly could use another HAL library. In Windows XP it is possible to install system with generic HAL library pressing F7 when installer asks to supply drivers, but on Windows 7 I can't find such option. Ironically, Vista installs and works nice, even if they said that Windows 7 is less demanding for hardware. Windows 7 Advisor also tells nothing suspicious. Can anybody tell me how to customize Windows 7 installer to use generic HAL library (if it is possible, of course) or point me to another solution?

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• Re-downloading accidentally deleted podcasts in iTunes

  - by Matt

  I deleted some previously deleted podcast episodes in iTunes 9 and I'd like to re-download them. (I don't want to manually re-download them because then they won't show up in the podcast's list in the iTunes Podcast section.) I've read http://blog.krisgielen.be/archives/54 as well as Way to get old podcasts in iTunes where the suggestion is to delete the iTunes entries for the podcasts I'd like to recover, then hold shift while re-opening that podcast's little triangle icon. Here's the problem though: holding shift and re-opening the triangle tells iTunes to refresh the RSS feed, and it's possible that the RSS feed no longer contains the item you want. What I'm really looking for is a means of getting the "Get" button (that normally appears on un-downloaded podcasts) to reappear on the episodes I've previously downloaded but deleted.

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• After installing Windows what should I do first? update or install antivirus?

  - by EApubs

  Normally, after reformating and installing Windows 7, I used to go online and install all the updates, install all the driver updates and then install the anti virus. Because long ago, when I installed the anti virus first, applying windows updates crashed the AV! So, I install it last. Specially 7 sp1 is critical right? But now im having doubts... Going online without an antivirus means I'm vulnerable! (I have a home router which have a small firewall but I'm not sure about it) So, whats the best thing to do? Install the anti virus first or install the updates first?

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• Windows 7 dual monitor setup: Wallpaper alignment

  - by Tomalak

  I have the following dual-screen set up on my Windows 7 PC: [2][1], that means my secondary monitor is on the right side of my primary monitor. Now I have a dual-screen wallpaper that should stretch across the monitors. I have set it to "Tile" mode. Problem: The wallpaper invariably starts at [1] (left edge of the image being on the left edge of [1]), and then continues on [2]. It basically splits the wrong way, producing a rather awkward look. How can I make the wallpaper appear correctly (i.e. left edge of the image being on the left edge of [2])?

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• Does a bad Internet connection increase bandwidth usage?

  - by Synetech

  My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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