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• sendmail Name server timeout

  - by broody

  Complete sendmail newbie here... I've been trying to get mailing to work in PHP and I've root caused it down to sendmail's complaint about "Name server timeout": >sendmail -t -v >From: [email protected] >To: [email protected] >. gmail.com: Name server timeout [email protected]... Transient parse error -- message queued for future delivery [email protected]... queued So it sounds like a DNS issue? But I can do a "dig mx gmail.com" and it will query successfully. Here's what confuses me... I can get sendmail to work two other ways. The first way is through telnet: >telnet 127.0.0.1 25 >Helo me >Mail from: [email protected] >Rcpt to: [email protected] >. message sent And the second way is by explicitly appending the sendmail.cf, but this is strange because it's the exact same file I use to configure sendmail to begin with: >sendmail -t -v -C/etc/mail/sendmail.cf But none of these solutions will resolve my PHP mailing... I am clueless as to what is going on... appreciate any help.

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• Diverting sound output of MCE to SPDIF

  - by Saxtus

  I have an ASUS SupremeFX II audio card (which in fact is an onboard audio riser slot) with the default drivers that are pre-installed by Windows 7 x64 for this card. I am able to manually switch between analog output and SPDIF output by the means of control panel (or external utilities like STADS), a change that affects all applications. The problem is that by doing that every time I am about to launch Windows Media Center, except that it's not that elegant, also makes all other Windows application's sounds to pass through SPDIF too, bypassing analog output completely, blending with what I am watching at Windows Media Center. Is there a way to make SPDIF as the default playback device for Windows Media Center? I know other programs that have a setting like that (foobar2000 for example) working like charm, allowing me to even have different outputs working at the same time (tested with my current card successfully). But when comes to Windows Media Center... it just use what the default playback device is all the time. The only setting that I know of, is under: Settings General Windows Media Center Setup Set Up Your Speakers and what it does is to just change the default playback device for entire system. Please help!

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• Maxtor 500GB external hard drive not being detected but power is going to it?

  - by ClarkeyBoy

  I have 2 * Maxtor Onetouch 4 Lite 500GB external hard drives (part no. 9NT2A4-500). They both used to work fine on my old laptop (an Acer) but I have not used them for about a year, since my laptop was stolen and I got this one (also an Acer [Aspire 7738G]). I have one plugged into the mains with one of the leads I believe was supplied with them. It appears to be receiving power as it is warm and the power light (on the unit itself) is on; also the mains adapter is fairly warm. I also have it plugged into my laptop with a USB lead which I have tested on my mp3 player (so I know it works). However my hard drive is not showing on my computer. I have tried checking for new hardware, installing the software that was supplied with it, checking drive letters in case it is registered as C: or something stupid, checking for problems etc... I can't find any cause for it to do this. It does appear to be starting up and, possibly, shutting down and restarting constantly (that's what it sounds like altho I can't be certain). I have had both hard drives stored in different places for the last year and they're both doing the same thing.. if it was only one then I'd guess it had got damaged or corrupted or something but since it is both I doubt this is it. The only things in common with both of them are the leads and the laptop, however I know the USB lead works and guess the mains lead works as there is power going to the unit. Has anyone come across this before or does anyone have any idea what the cause / solution to the problem is? Any help would be greatly appreciated. Regards, Richard

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• OS X Hard drive recovery

  - by Adam

  I am trying to recover data from a bad Seagate 1TB hard drive in a 2010 iMac. One day the iMac wouldn't boot (stuck at gray screen on startup). I removed the hard drive from the iMac and connected it to a MacBook using a 3.5" HDD to USB adapter. The hard drive wouldn't mount but it did display in Disk Utility that that there were 2 partitions on the disk. I tried to run Disk Warrior and it showed thousands of errors but still wouldn't mount. At this time the hard drive only show one partition in Disk Utility. Next I tried putting the hard drive in a desktop PC and running Spin Rite - which then gave me several division overflow errors (even with running Spin Rite with a newer version of DOS). The SMART status on the drive reports that the drive has had failures and HD Tune referenced the drive had once hit 59 degrees celsius. Disk Utility gives me the following message when running a pair: Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files. Overall, the hard drive spins up and sounds OK - there are no clicking noises but the hard drive won't mount and displays as a light gray "Macintosh HD" in disk utility. Any tips or advice on how to recover data on this drive would be GREATLY appreciated! Are there any other tools I can try before calling it quits on this drive? Thank you

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• Brick-level backup and restore with exchange 2007

  - by V. Romanov

  In the company I'm working for, we use exchange 2007 and backup it using netbackup. The backup is a daily complete backup of the information store and the direct corollary of this is that restores are hell. We need to restore the entire information store (over 80 gb), somehow merge it back with the original store, which causes problems. Alternatively, we tried using QUEST software to emulate exchange and restore mails from the emulation. However, this proved unreliable. The main problem with this entire situation is that we have to restore the whole information store and walk it through the restore process manually, and its quite absurd to be forced spend more than a day restoring even one erased email. (we have erased mail retention, but sometimes we need to restore older mail). in comparison, back in the day of XCH2003 and backupexec 12, we had complete brick level backup and restore at the push of a button. I've spoken to one of our chief sysadmins who claimed that the official response from microsoft to this issue was - "sorry guys, no brick level backup in XCH2007" which sounds ridiculous to me. Can someone shed some light on the situation? How do you backup your exchange2007 stores? Can you restore a single email quickly? A mailbox, perhaps?

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• [URGENT HELP PLEASE]USB Flash Drive Problem!

  - by Daren

  Here it goes. My friend saved by his works into my flash drive which was detectable/openable but ... The very next day, the drive wouldn't show up in My Computer and Windows gave him error code 43 (Unknown device). I been searching for the next few hours to find a solution as the works inside is important to him. I know he should back up his files but let's not go there. So .... I tried others few systems that once detected his flash drive but the problem still persisted. I don't know whether or not his flash drive is damaged but when plug/un-plugging, there are still sounds coming out though. Tried solutions: [On Vista Home Premium/HIS COME]Uninstalled -- Restarted com -- Re-installed (ERROR 43) [Windows 7/MY COM] Uninstalled --- Restarted com --- Can't install (ERROR 43) It seems that my com (Windows 7) had the lastest drivers already but still can't detect it. Its a Kingston DataTraveller 101 (DT101) 8GB. Could unplugging the flash drive without clicking "Safely Remove Hardware" is the problem? Kindly provide some help. Thank you all.

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• SPDIF passthrough not working in Windows 7

  - by adriangrigore

  Hi, I'm running Windows 7 on a computer with an Audigy Platinum eX sound card connected to a surround receiver via optical cabling. Sound works fine when listening to non-surround audio sources, such as windows sounds or MP3. However, when I view a DVD in Media Center and the SPDIF passthrough kicks in, I can only hear an awful noise instead of the movie soundtrack. Also, the receiver does not show the Dolby Digital or DTS symbol, but stays at Dolby Prologic, so it seems it doesn't identify the sound encoding properly. I could switch off SPDIF passthrough and use the sound card's decoder instead, but that's not an option for me since it would create more problems with regular MP3 playback via additional Stereo Receiver which is also connected to the same sound card. I've tried both the default Audigy drivers that come with Windows 7 and the latest drivers from the Soundblaster website, but the problem remains unchanged. Also, I have ensured that the receiver's Dolby Digital decoder is not broken by successfully connecting it to my PS3 to view a Dolby Digital DVD. Besides, SPDIF passthrough was working fine in Vista before I upgraded to Windows 7. Is there anything else I could try?

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• USB Flash Drive Problem!

  - by Daren

  Here it goes. My friend saved by his works into my flash drive which was detectable/openable but ... The very next day, the drive wouldn't show up in My Computer and Windows gave him error code 43 (Unknown device). I been searching for the next few hours to find a solution as the works inside is important to him. I know he should back up his files but let's not go there. So .... I tried others few systems that once detected his flash drive but the problem still persisted. I don't know whether or not his flash drive is damaged but when plug/un-plugging, there are still sounds coming out though. Tried solutions: [On Vista Home Premium/HIS COME]Uninstalled -- Restarted com -- Re-installed (ERROR 43) [Windows 7/MY COM] Uninstalled --- Restarted com --- Can't install (ERROR 43) It seems that my com (Windows 7) had the lastest drivers already but still can't detect it. Its a Kingston DataTraveller 101 (DT101) 8GB. Could unplugging the flash drive without clicking "Safely Remove Hardware" is the problem? Kindly provide some help. Thank you all.

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• Toshiba External Hard Drive freezes computer

  - by Ephraim

  I bought a Toshiba Canvio Basics E05A032BAU2XK Portable External 320GB 2.5 Hard Drive: My computer has two Os's on it Win7 and Win XP. I need both. The main one I use is XP. When booting my computer in any OS the computer and hard drive work fine. The same holds true for plugging in the hard drive while running Win7. However, when running WinXP, if the hard drive gets plugged in the computer freezes(my main point is that the HD is portable so it is essential that it does not do this, as I said I usually run XP). After reading some online forums I was informed that there is a compatibility issue with the newest version of Eset Smart Security(I still don't understand this because it works fine in Win7 or when connected on boot...). I disabled the AV and plugged in the HD... Walla! The comnputer did not freeze. However the disk is not recognized in explorer or disk management. In device manager I removed the device and did a scan and installation of device failed. It pretty much sounds like a driver issue but I cannot find any drivers for this HD. In fact, Toshiba claims that there are no downloadable drivers for it and that XP should take care of the drivers itself. What to do? As far as I can tell, all other USB devices work just fine on both OS. Please Help!

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• Name one good reason for immediately failing on a SMTP 4xx code

  - by Avery Payne

  I'm really curious about this. The question (highlighed in bold): Can someone name ONE GOOD REASON to have their email server permanently set up to auto-fail/immediate-fail on 4xx codes? Because frankly, it sounds like "their" setups are broken out-of-the-box. SMTP is not Instant Messaging. Stop treating it like IRC or Jabber or MSN or insert-IM-technology-here. I don't know what possesses people to have the "IMMEDIATE DELIVERY OR FAIL" mentality with SMTP setups, but they need to stop doing that. It just plain breaks things. Every two or three years, I stumble into this. Someone, somewhere, has decided in their infinite wisdom that 4xx codes are immediate failures, and suddenly its OMGWTFBBQ THE INTARNETZ ARE BORKEN, HALP SKY IS FALLING instead of "oh, it'll re-attempt delivery in about 30 minutes". It amazes me how it suddenly becomes "my" problem that a message won't go through, because someone else misconfigured "their" SMTP service. IF there is a legitimate reason for having your server permanently set up in this manner, then the first good answer will get the check. IF there is no good reason (and I suspect there isn't), then the first good-sounding-if-still-logically-flawed answer will get the check.

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• Amazon CloudFront and EC2: Global Load Balancing

  - by Matt Rogish

  We have an app that is going to store and serve up a decent amount of data in S3 to a global audience where latency should be minimized. So, we've been doing tests with Amazon CloudFront and have seen favorable results. However, we need a thin middleware layer (to do security etc.) and we'd like to put that in EC2. Due to security restrictions, this middleware layer will do the file streaming from S3/CloudFront: S3/CloudFront - EC2 - Clients We can geographically distribute the EC2 nodes (US East/West, and Ireland) but the problem is that a client in the EU would hit our US server and be fed data from there, thus rendering much of the performance benefit of CloudFront moot. I've been digging through the EC2 docs but I can't find a built-in way to get a geographically distributed version of EC2 a la CloudFront. Elastic Load Balancing sounds like the way to go, but I can't seem to find a way with that to direct based on routing... Preferably, we'd like to keep the amount of stuff outside of EC2/S3/etc. to a minimum (for obvious reasons). Any ideas how to do that within the EC2/S3 framework? DNS/routing tricks? Thanks!

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• How to remap IPs visible from local machine to IPs visible from a machine I have SSH access to?

  - by gooli

  I'm so far out of my depth I don't even know what to google for. There's a server I can connect to via SSH. Via that server I can access other server on its subnet via SSH. What I want to do is be able to access the machines that server has access to directly. Say the server IP is 192.168.7.7 and is the only one in the 192.168.x.x range I have access to. I'd like to configure things in such a way that when I to access say 192.168.7.100 on my machine, the connection will go through an SSH tunnel I open to 192.168.7.7 and out to 192.168.7.100. I would like this to work for any port if at all possible. I know I can set an HTTP proxy and even a SOCKS proxy, but I'm wondering is there is a way to actually remap some of the IP my machine sees to IP only visible from the remote machine. What would this configuration be called? IS this NAT, VPN, IP2IP or something else? How can I set up this on a Windows client box that connects via SSH to a Linux box? Sounds to me like I need to set up some kind of filtering on the network driver or possibly a virtual NIC, but I'm not sure where to go next.

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• 3 Servers, is this is a cluster?

  - by Andy Barlow

  Hello, At the moment I have one Ubuntu server, 9.10, running with a simple Samba share, a mail server, DNS server and DHCP server. Mostly its just there for file sharing and email server. I also have 2 other servers that are exactly the same hardware and spec as the first, which have an rsync set up to retrieve the shared folders and backs them up. However, if the first server goes down, all of our shares disappear along with our mail and the system must be rebuilt. Also I tend to find if people are downloading a large amount from the file server, no-one can access there emails - especially in the morning when everyone is signing in at once. Would it be more beneficial for me to have all 3 servers, all running the same services, doing the same thing with some sort of cluster with load balancing? I'm not really sure where to begin looking, or how to go about such a setup where 3 servers are all identical, but perhaps one acts as the main load balancer?? If someone can point me in the right direction, or if this simply sounds like one of those Enterprise Cloud's that is now a default setup in Ubuntu Server 9.10+, then I'll go down that route. Cheers in advance. Andy

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• How do I keep a table in sync across multiple SQL Databases?

  - 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." Go figure!

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• AMD 700, 800 series chipset. I'm lost.

  - by Shiki

  I've been an Intel / NVidia user ever since I started using computers. Intel really gone up with the prices, and they won't get cheaper. So I decided to get an AMD. But WHICH one? I mean.. not shopping question but.. what are the differences? Like: 880GMA comes only with a single PCI ex and it looks like a chinese replica (no offense). While 890FX comes with 5PCI-ex for QuadCrossfire. Also.. what's the deal with 7xx series? I mean.. its the same price. Yet its older? Or why is it 7xx? Isn't there a single chipset between? Not chinese YET it's durable/fine for long-term usage? What it should know (desktop stuff): NVidia GPU (Zalman AMP2 GTX 260^2 (one card)) Phenom 1090T cpu A somewhat good audio. Any ideas which is the chipset I'm searching for? If this sounds too much of a shopping question, feel free to edit. I just want some clarification on these chipsets.

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• Identify differences between MP3 files

  - by Thingomy

  I have 2 old similar directory trees with MP3 files in them. I am happily using tools like diff and Rsync to identify and merge the files that are only present on one side, or are identical, I'm left with a bunch of files that are bitwise different. On running diff over a pair actually different files, (with -a tag to force text analysis) it produces incomprehensible gibberish. I have listened to files from both sides, and they both seem to play fine (but at nearly 10 minutes per song, when listening to them twice each, I haven't done many) I suspect the differences are due to some player in the past "enhancing" my collection by messing about with ID3 tags, but I can't be certain. Even if I identify differences in ID3 tags, I would like to confirm that no cosmic ray or file copy error issues have damaged any of the files. One method that occurs to be is finding the byte locations of the differences, and ignoring all changes in the first ~10kb of each file, but I don't know how to do this. I have on the order of a hundred or so files that differ across the directory tree. I found How to compare mp3, flac audio data in a file, ignoring header data (ID3 tag) etc.? -- but I can't run alldup due to being Linux only, and from the sounds of it, it would only partially solve my issues anyway.

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• Warning for "Reallocated Event Count" S.M.A.R.T. attribute with a new/unused drive. How serious is t

  - by Developer Art

  I've just looked at the health status of my old 2,5 inch 500 Gb Fujitsu drive with a popular "HD Tune" utility. It shows a warning for the "Reallocated Event Count" property. How serious is that? The thing is that the drive is practically new. I pulled it out of a new laptop over a year ago and never used it since. Right now it only has 53 "Power On" hours which sounds about right since I only had it running a few evenings overnight before switching it for something more performant. Does this warning indicate that the drive is likely to fail some time in the future? I'm somewhat perplexed since the drive is effectively unused. What is more, I have arranged with somebody to buy off this drive since I don't really need. It is 12,5 mm thick (with 3 plates) meaning it doesn't fit into an external enclosure which makes it quite useless to me. Can I give away the drive without having it on my conscience or better cancel the deal? In other words, can the drive be used safely for years to come or better throw it away? I'm running a sector test now to see if there are any real problems. Will post the results as soon as they're available.

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• Overheating Toshiba Satellite L300

  - by ldigas

  A coleague of mine's having trouble with his new Toshiba Satellite L300 ... I tool a kook at it, and indeed it's hot as hell. I couldn't hold my hand on it for too long. He says it also has a tendency to turn itself off (WinXP 32bit running) with no forewarning. Hasn't happened to me while I was using it, but that wasn't long anyways. The first guess was it was too dirty ... problem is it's new, came out of a package a quarter of a year ago. Kept in a clean environment (office). Looks clean. No dust in sight. Second guess is that the fan wasn't working properly, cause indeed it has intervals of working, and non working. But when I listen to it, it sounds like normal usage. I took a SpeedFan measurement, and it reports temp. up to 85 Celsius ... which is definitely too high. Anyone knows what else I could do to it ? It is under warranty and it will go to the service, but I thought if there is something we can do, as to avoid carrying it there / be without it for a week ...

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• BIOS unable to boot CD or Hard Drive

  - by Gabriel

  Motherboard Intel DQ35MP. HDD Caviar Green 1TB. I'm having problems with my BIOS and/or hard drive/disc drive. Came back from a trip, booted my computer, and realized that the BIOS wasn't booting anymore, just a black screen with no beep sounds. Only fans and lights on. Then I thought it might be caused by the video card, I removed it, and still no BIOS screen. Then I removed the hard drive and voila BIOS screen is back again. If the hard drive is defective then I can check that with a Rescue Disk. I inserted the CD on the Disc Tray but the computer did not respond to it, the screen freezes in black with an "E7" string at the bottom right corner just after the BIOS screen, this happens with or without discs. BIOS settings are set to default, and CD reading is on top of the boot device list. EDIT I removed the BIOS battery, rebooted the CPU, the BIOS screen showed up, and then it freezed in E7. Placed the BIOS batttery, rebooted and same thing, we are stuck with the E7 string. I uploaded a video to illustrate the problem http://www.youtube.com/watch?v=13jPdBcIrBU

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• windows 7: Event 55 The file system structure on the disk is corrupt and unusable

  - by Radio

  Here is a real bad one! Windows 7 RTM with SP1 installed [Version 6.1.7601]. Recently tried to delete some folder on my hard drive and Windows prompted "Error 0x80070570: The file or directory is corrupted and unreadable", and at the same time placed an Event 55 describing "The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on \Device\HarddiskVolume2." Ran chkdsk, first with /f option, then with /r option. Result in both cases was: no errors found, 0 bad sectors. No problems chkdsk found at all! Went through StackExchange, Google and spent over 6 hours on this. Still cannot figure out the problem. Re-installing/Re-Formatting is not an option! What did I try: Hotfix - Windows6.1-KB982927-x64.msu - gave me an error about incompatibility with my computer, however it totally matches my system. CRC of hotfix was ok. Windows Repair Console found startup errors and fixed those, but this didn't help an issue, even by running chkdsk c: /R from it. http://support.microsoft.com/kb/246026 does not promise anything good. sfc /scannow does not help too. Replaced hard drive by cloning an old one using True Image, repeated all steps above. At the same time, some minor glitches started to appear in my Windows, like side panel and notification area settings are getting reset. Goal is to delete the folder and get rid of Event 55. Sounds like NTFS bug. Please help. This is completely ridiculous.

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• Minimum permissions needed to create a user Home Folder in Windows Active Directory

  - by Jim

  We would like the Help Desk to have the responsibility of creating User Home folders instead of our 2nd level support. The help desk global group is already an Account Operator, so in Active Directory they are able to edit all User Attributes just fine. The problem is figuring out the minimum level of permissions needed on the File Server to create the home share, with out giving them access to everyone home share. So if they open AD Users and Computer, open the properties for a user, and enter \home\users\%username% in the profile tab and then click OK, they get the following error. The \home\users\username home folder was not created because you do not have create access on the server. The user account has been updated with the new home folder value but you must create the directory manually after obtaining the required access right. Right now I have given the Helpdesk group Full Control on the root folder only (no files or subdirectories) The directory is actually created, but the permissions on the newly created folder only show administrators full control, and no permissions for the configured user account. It sure sounds like I'd have to make the helpdesk local admins on the file servers, which is what I'd like to avoid. Especially since the file servers are a large cluster hosting much much more than the entire orgs home share structure.

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• how to authenticate once for multiple servers, using only apache configs?

  - by Wang

  My problem is, I have a number of prepackaged web apps (a print system, a wiki, a bug tracker, an email archive, etc.) running on different Mac OS X Leopard (soon to be SL) servers that each need to authenticate users from the internet at large. Right now every server presents an Apache basic authentication prompt, which takes a shared login, but it's apparently enough of an inconvenience to log in repeatedly that people are sending email without checking the wiki or bug tracker or archive. In the case of the bug tracker, a user [might need to log in twice---once for apache if he hasn't used any other protected service on that server, once for the bug tracker itself so it can distinguish different people. Since the only common component to all these apps is Apache 2 itself, does it have any way of authenticating a user once, in some way that will be respected by other servers and various web apps? Looked at http://serverfault.com/questions/32421/how-is-session-stickiness-achieved-across-multiple-web-servers but it sounds like the answer is assuming that I get to write my own web app. Looked at Ian Bicking's blog but it's four years old and recommends something available only for apache 1.3, not apache 2. Sorry not to hyperlink the second site---apparently I need 10 reputation points. Edit: Shibboleth does what I need, but I should have specified that I'm looking for a really dumb, really simple solution for in-house services that need to handle all of a dozen users, probably not more than three at a time.

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• How to diagnose occasional sudden resets?

  - by steve314

  I have a Windows XP system, and have recently upgraded by adding 2 1GB sticks of RAM to the 2x0.5GB already present. Since then, about once per day (the system is used 8+ hours per day), the system has suddenly and unexpectedly reset. On a couple of occasions, the system has frozen completely, only responding to the power button being held in for several seconds to force power off. Nothing at all ever appears in the system event log that might indicate a possible cause - everything seems to suggest business as usual. Sounds like faulty memory - but memtest86+ says otherwise. A full test, taking over an hour, found no issues. The next likely suspicion, then, is that I've knocked something while installing the RAM. Trouble is, everything I can think of to test seems fine. I've opened up the case and prodded a few things around, hoping to get better contact on connections etc, but there's no sign yet as to whether that has made a difference or not. I thought about a malware-related timing fluke, but again, so far as I can tell I'm all clear. All I can think of to add to my checklist (mainly of things that I can't easily check) is... The power supply is (1) only 350W, (2) not necessarily the best quality, and (3) powering a Prescott P4 640 3.2GHz. Could that be borderline overloaded or about to die? How do I check? Is it possible that the CPU isn't getting cooled properly? I haven't had the fan past normal tickover even doing video encoding, and the only sane temperature reading from SpeedFan is pretty steady at 36 celcius, so probably not. Any thoughts? Is there a standard procedure for diagnosing this kind of fault?

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• Forwarding HTTP Request with Direct Server Return

  - by Daniel Crabtree

  I have servers spread across several data centers, each storing different files. I want users to be able to access the files on all servers through a single domain and have the individual servers return the files directly to the users. The following shows a simple example: 1) The user's browser requests http://www.example.com/files/file1.zip 2) Request goes to server A, based on the DNS A record for example.com. 3) Server A analyzes the request and works out that /files/file1.zip is stored on server B. 4) Server A forwards the request to server B. 5) Server B returns file1.zip directly to the user without going through server A. Note: steps 4 and 5 must be transparent to the user and cannot involve sending a redirect to the user as that would violate the requirement of a single domain. From my research, what I want to achieve is called "Direct Server Return" and it is a common setup for load balancing. It is also sometimes called a half reverse proxy. For step 4, it sounds like I need to do MAC Address Translation and then pass the request back onto the network and for servers outside the network of server A tunneling will be required. For step 5, I simply need to configure server B, as per the real servers in a load balancing setup. Namely, server B should have server A's IP address on the loopback interface and it should not answer any ARP requests for that IP address. My problem is how to actually achieve step 4? I have found plenty of hardware and software that can do this for simple load balancing at layer 4, but these solutions fall short and cannot handle the kind of custom routing I require. It seems like I will need to roll my own solution. Ideally, I would like to do the routing / forwarding at the web server level, i.e. in PHP or C# / ASP.net. However, I am open to doing it at a lower level such as Apache or IIS, or at an even lower level, i.e. a custom proxy service in front of everything. Thanks.

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• Using modem for sending voice recording

  - by ircmaxell

  I've got an interesting one for you. I've been going over my server monitoring and notification systems (Nagios based), and realized that if our internet connection goes down, there's no way for it to notify me. I already have a modem listening (Via CentOS 5) on a spare POTS line so that I can dial-in in case our internet goes down. I was wondering if I could come up with a script (Shell, Python, etc) that can dial out and play a recorded message (wave file I'm guessing) when it's picked up. I know Windows supports voice calls over a voice modem, I was wondering if a solution existed for Linux... I know asterisk can probably do it, but isn't that overkill (A full blown VOIP system just for a notification mechanism that will hopefully never be used)? And wouldn't it interfere with the modem's primary function as a backup network interface (PPP spawned via mgetty)? I've done some searching, and haven't really come up with much. I know how to dial out from the command line, but only as a modem (not as voice). Worst case, I could set it up to dial out as a modem, and then just realize that if I get a call with modem sounds from that number that it's the notification... Any insight would be appreciated...

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