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• Does a VPN requirement kill the concept of having a Web Application in the Cloud?

  - by Christian

  Recently I posted a question in SO, but so far I got no answers. I wonder if I'm asking the wrong question. This is the problem: We need to design an application which offers a public http web service, but at the same time it must consume some services through a VPN connection from other existing company. There is no other alternative but to use a VPN connection to access those services. We want to host our application in some cloud infrastructure like Heroku or Amazon EC2. But there is no direct way to access the VPN services of the other company from there. The solution I'm thinking, but I don't like is to have a different server to expose the services from that VPN. But this will require the setup of another server which I prefer to avoid. In the case this is the solution, can I use an Amazon EC2 instance to connect to a VPN? This is what I was thinking, is it correct? I don't have experience using VPNs, tunnels or those kind of networking stuff. I will really appreciate if you can propose me an alternative solution, or just give me a comment.

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• Mavericks permission issues with Windows Server deduplicated shares

  - by dmohlmaster

  We have a number of 10.9-10.9.3 - Mavericks - machines installed throughout our facility. Much of the user content is pulled from shares stored on our Windows Server 2012 fileservers with deduplication enabled. I have found that files newly written or unoptimized are able to be accessed without issue - read, written, modified, etc. Once the file gets optomized/deduplicated and Windows adds the P & L attributes - sparse and symlink - the Macs running Mavericks begin to have access issues. Once the files get deduplicated, users begin receiving read access errors when copying files (see error1 below). This happens when copying to folders within the current folder tree or copying somewhere to the local system. If you 'stop' the copy operation and retry a few more times, it may eventually work for the specific instance but fail again later. I am however, able to copy these files without issue via the terminal. Other systems running 10.7 do not experience the same issues and are able to access file server resources without issue. Many of the systems having issues are newer and thus not able to be downgraded to 10.8 or 10.7. I have tried finder replacements such as Pathfinder but the results are the same. I know this is at least similar to the issues many Mac users are already experiencing and posting about but I haven't seen it directly linked to deduplication and the attributes written by Windows server. Has anyone seen this issue? Have any solutions been found? Error 1: When copying files after the PL attributes have been set by deduplication. "One or more items can't be copied to "Foler" because you don't have permissions to read them. ******************************************' Via the system.log, I am also seeing the following error when accessing these deduplicated file shares. The reparse point tag listed below is "IO_REPARSE_TAG_DEDUP" Reported error: "smbfs_nget: filename.ext - unknown reparse point tag 0x80000013"

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• No sound out of headphone port on laptop

  - by Thanatos

  I cannot get sound out of the headphone port on a laptop. Headphones are plugged in, and sound comes out of the internal speakers. Windows behaves normally (sound switches to headphones when headphones are inserted). It did work in Linux at one point, but something changed, we're just not sure what. Rebooting doesn't fix. This appears to occur whether or not PulseAudio is running. Things I've tried: Rebooting. No effect. Booting into Windows. It works properly, so probably not a hardware issue. All of alsamixer. My only controls are this: "Master" Volume bar & mutable, unmuted. Controls volume. "PCM" Volume bar only. 100%. "S/PDIF" Mutable only, currently muted, has no effect. "S/PDIF" Default PCM", Mutable only, currently unmuted, has no effect. Killing PulseAudio. No effect. (It also won't stay dead! Something appears to be restarting it, and I can't tell what, but it is annoying as fuck.) alsactl init 0, no effect. sudo rm -f /var/lib/alsa/asound.state, no effect. General system info: Ubuntu 10.04 LTS Toshiba Satellite T135D-S1324 lspci says I have: 00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA) 01:05.1 Audio device: ATI Technologies Inc RS780 Azalia controller Some edits: Yes, the headphones are in all the way. This works in Windows: You plug headphones in, the internal speakers stop making noise, and noise comes out the head phones. Windows says I only have two sound cards: the HDMI port (which I don't care about) and the "sound card", which it claims is a "Conexant Pebble High Definition SmartAudio" In Windows, both the internal speakers and the headphone jack show up as one soundcard, which in my experience, is typical. (This is a laptop)

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• How do you gracefully upgrade mission critical systems to wildly disparate systems?

  - by Ernie

  In the span of the 12+ years of my career, I have yet to overcome this hurdle and I suspect the answer simply isn't easy or even possible, so I ask everyone here for their experience. Say that you're running into egregious problems that can only be fixed by moving from one platform to another - either from making a mistake in choosing the platform that was chosen years ago, or simply growing beyond what the system was originally designed for. You know for certain that the cruft that has built up over time will invariably mean that it will be nearly impossible to test for all the things that will certainly lead to tech support hell - which we all know leads to the loss of customers. Not that customers aren't already complaining about the egregious problems that already exist! The best possible way that I've discovered so far is to maybe devise a plan for the changeover, test it on a few clients, test it on a dozen clients, test it on a hundred clients, then finally finish the changeover for everyone and pray that you've worked out all the bugs with those first hundred and twenty, and that the animal by-products will not hit the ventilation system in the most spectacular fashion possible. However, that doesn't mean that it won't anyway. So say that you're moving from Exchange to Exim (or even just Sendmail to Exim). How do you handle it?

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• Important hardware components to avoid bottlenecks/improve speed on a laptop?

  - by joelhaus

  Looking for a powerful general use (including web development) laptop running Windows. Price points seem to be all over the place. Many less powerful machines are priced much higher than machines with better specs. How does one navigate this market? Are there any unpublished/under-publicized specs/bottlenecks you look for? Understanding that hardware improves over time, is there an efficient ratio that can be used (or something similar, like Windows Experience Index?) which will indicate how powerful a system is? Thanks in advance! P.S. Here is an example from a laptop released on September 17, 2010. Can anyone pick apart these specs? Is there missing information you would be looking for? OS: Win 7 Display: 16.4" LED backlit Processor: Intel Core i7-740QM, 6MB L3 Cache RAM: 6GB DDR3 1333MHz (8GB max.) Graphics: NVIDIA GeForce GT 425M (1 GB of dedicated DDR3) HDD: 500GB 7200RPM SATA Hard Drive Removable Disc: Blue-ray with DVD±R/RW Misc: webcam/mic/speakers/bluetooth (via Sony Vaio VPC-F137FX/B)

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• How can something relevant to graphics completely kill a motherboard?

  - by leladax

  I was coding something in OpenGL and after a bug there was an 'OS slowed down' situation. After a few seconds the screen went blank and the laptop shutdown. Now not even a led turns on battery or not. It doesn't appear to be the AC or the battery since there was some battery when it died and when it's connected to the AC the laptop produces near the AC connection a very slight 'clicking' noise (very faint, one has to be very careful to notice it, I don't know if it was there forever tbh). I suspect the motherboard died, as in something from the point it gets AC or battery power and the point it actually feeds itself. But I can't figure out how that effect was produced by the OpenGL bug or graphics overheating. If the graphics died alone, it should at least give some indication that the laptop is barely alive, at least a led, a sound, anything, the laptop is instead completely dead (other than faint 'clicking' I mentioned). Does anyone have expert advice on this? I'm especially interested in any ideas connected to "graphics overheated/bugged ---- they killed motherboard". I have a very lengthy experience in that stuff as a hobbyist and it really puzzles me. It's not just a "AC died" situation I can easily google.

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• How browsers handle multiple IPs

  - by Sandman4

  Can someone direct me to information on exact browsers behavior when browser gets multiple A records for a given hostname (say ip1 and ip2), and one of them is not accessible. I interested in EXACT details, like (but not limited to): Will browser get 2 IPs from OS, or it will get only one ? Which ip will browser try first (random or always the first one) ? Now, let's say browser started with the failed ip1 For how long will browser try ip1 ? If user hits "stop" while it waits for ip1, and then clicks refresh which IP will browser try ? What will happen when it times-out - will it start trying ip2 or give error ? (And if error, which ip will browser try when user clicks refresh). When user clicks refresh, will any browser attempt new DNS lookup ? Now let's assume browser tried working ip2 first. For the next page request, will browser still use ip2, or it may randomly switch ips ? For how long browsers keep IPs in their cache ? When browsers sends a new DNS request, and get SAME ips, will it CONTINUE to use the same known-to-be-working IP, or the process starts from scratch and it may try any of the two ? Of course it all may be browser dependent, and may also vary between versions and platforms, I'd be happy to have maximum of details. The purpose of this - I'm trying to understand what exactly users will experience when round-robin DNS based used and one of the hosts fails. Please, I'm NOT asking about how bad DNS load balancing is, and please refrain from answering "don't do it", "it's a bad idea", "you need heartbeat/proxy/BGP/whatever" and so on.

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• Best Asp.net Hosting

  - by dotnetguts

  There are many asp.net web hosting companies which spends lot on advertisement and also gives you very cheaper rate, as low as $5, but when it comes to support they are simply hopeless. Everyone can you please pass your experience with your past hosting companies and suggest any good asp.net hosting company? Please consider following requirement factors 1) Asp.net 3.5 or 4.0 supported. 2) Url Rewriter support 3) GZip support (Dynamic through code) 4) Initial Setup support (If required) 5) SQL Server 2005 or 2008 6) Allow to access SQL Server DB using SQL Mgmt Studio 7) Environment supporting Backup and Restore of DB on my own, without involving tech support team 8) Full Text Search support 9) FTP support 10) I can able to send atleast 500 Emails daily. 11) 99.9% Up Time (No matter all web hosting say they have 99.9% Up Time, but its not true). 12) Alert Email to be sent when they do any maintenance or during downtime. 13) Hosting Price should be reasonable. Incase you feel i am missing something please add to the list. Can anyone suggest good webhosting company based on above factors?

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• Having trouble keeping a 1GB RAM Centos server running

  - by Josh

  This is my first time configuring a VPS server and I'm having a few issues. We're running Wordpress on a 1GB Centos server configured per the internet (online research). No custom queries or anything crazy but closing in on 8K posts. At arbitrary intervals, the server just goes down. From the client side, it just says "Loading..." and will spin more or less indefinitely. On the server side, the shell will lock completely. We have to do a hard reboot from the control panel and then everything is fine. Watching "top" I see it hovering between 35 - 55% memory usage generally and occasional spikes up to around 80%. When I saw it go down, there were about 30 - 40 Apache processes showing which pushed memory over the edge. "error_log" tells me that maxclients was reached right before each reboot instance. I've tried tinkering with that but to no avail. I think we'll probably need to bump the server up to the next RAM level but with ~120K pageviews per month, it seems like that's a bit overkill since it was running fairly well on a shared server before. Any ideas? httpd.conf and my.cnf values to add? I'll update this with the current ones if that helps. Thanks in advance! This has been a fun and important learning experience but, overall, quite frustrating! Edit: quick top snapshot: top - 15:18:15 up 2 days, 13:04, 1 user, load average: 0.56, 0.44, 0.38 Tasks: 85 total, 2 running, 83 sleeping, 0 stopped, 0 zombie Cpu(s): 6.7%us, 3.5%sy, 0.0%ni, 89.6%id, 0.0%wa, 0.0%hi, 0.1%si, 0.0%st Mem: 2051088k total, 736708k used, 1314380k free, 199576k buffers Swap: 4194300k total, 0k used, 4194300k free, 287688k cached

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• On Windows machines, what is the typical toolchain for remote maintenance?

  - by Hanno Fietz

  I need to deploy PHP and Python code and the appropriate environment (web server, db server) to remote Windows systems, and I don't know what toolchain would be the equivalent to ssh, scp, bash and the like. So, basically, what I need to be able to do is the following: access remote Windows with the appropriate privileges in a secure manner, like I routinely do with ssh (I don't even know whether that would be a text or graphic interface on Windows). remotely install software: Apache or IIS, MySQL or Postgres, Python or PHP copy files from remote (the application we're deploying) remotely configure the machine to run regular tasks (e. g. checking for updates to the application) automate tasks like downloading files from a designated place The main question is probably how I get onto the machine securely in the first place, and then the rest is general Windows admin knowledge, which probably is too broad a scope to fit into one question. I have years of experience with maintaining Linux boxes and I have used tools of varying sophistication on those, ranging from plain scping of PHP files to deployment of Java application containers and even full VMs with Vagrant. On Windows, I'm a complete noob, and I don't even know where to start. I have installed Apache, MySQL , PHP on a desktop machine maybe twice in my life, that's about it. Bonus points for things that work from a Linux machine at my end, but I could run a VM and do everything from there.

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• Advice on Computer Specs for overall development/general use machine

  - by Ender

  At the moment I am restricted to a laptop with 512MB of RAM, a 120GB HDD and a 1.5GHz Intel processor for all my development and general browsing needs, and as you can probably tell using it for anything modern is a painful experience. As a result I've decided to buy myself a new desktop computer, one that will stand the test of time and one that can be upgraded easily. Rather than build the machine myself I've decided to go through Dell as I've had good experiences with them when purchasing computers for my family. I've had my eye on this as it's got a good amount of RAM, has a decent-rated processor and isn't priced too badly. http://www1.euro.dell.com/uk/en/home/Desktops/inspiron-580/pd.aspx?refid=inspiron-580&s=dhs&cs=ukepp1&~oid=uk~en~20211~inspiron-580_d005827~~ Intel® Core™ i5 Processor 750 (2.66GHz, 8MB) Genuine Windows® 7 Home Premium 64bit - English Display Not Included ATI Radeon™ HD 5450 1GB DDR3 graphics 6144MB Dual Channel DDR3 [3x2048] Memory 1TB (7200rpm) SATA Hard Drive DVD +/- RW Drive (read/write CD & DVD) with DVD Burn software 1 year of coverage included with your PC McAfee® Security Centre - 15 Month Protection - English After the pain of using a slow laptop for all this time the main thing I want is speed. I may look to play a couple of basic games on it, nothing too powerful. Obviously I'll be doing some development on it too so it'll have to be able to handle the latest IDE's and Database tools like SQL Server pretty quickly. Finally, should I ever need to improve it I'd like to be able to add more RAM and change some of the parts. I wouldn't have thought this would be a problem but a few people I've spoken to have said that the amount of RAM the motherboard can handle isn't that great. Is this true? How long can I expect to be using this computer before it's too slow? Thanks in advance for the help.

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• How to organize deployment process in Chef-controlled environment?

  - by Alex

  I have a web Linux-based infrastructure which consists of 15 virtual machines and over 50 various services. It is fully controlled by Chef. Most of the services are developed internally. Basically the current deployment process is triggered by a shell script. A build system (a mix of Python and shell scripts) packages the services as .deb files and puts these packages into a repo. It runs apt-get update on all 15 nodes then because the standard Chef apt cookbook only runs apt-get once per day and we definitely do not want to run apt-get update unconditionally on each chef-client wake. The build system restarts chef-client daemons on all 15 nodes finally (we need this step because of pull Chef nature). The current process has a number of drawbacks we want to address. First off, it is asynchronous because the deployment script does not check chef-client logs after restart so we don't even know if the deployment was successful. It does not even wait for Chef clients to complete the cycle. Second, we definitely do not want to force chef-client restarts on all nodes because we usually deploy only a small number of packages. And third, I am not quite sure using chef-client for deployment is legitimate, probably we are just doing it wrong from the start. Please share your thoughts/experience.

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• What are the replacement options for an IDE hard disk for a DOS based system?

  - by dummzeuch

  I have got a few "embedded" systems running MSDOS 6.2 which boot from and store data to IDE hard disks. Since these drives are nearing their end of life, the question arises how we can replace them. The requirements are: DOS must be able to install and boot from these drives. They must be able to sustain heavy (mostly) write access. If possible, they should be able to survive moderate vibrations (not too bad since the current hard disks have survived several years of that) I considered the following options so far: other ide hard drives: Unfortunately modern IDE drives are too large so DOS cannot boot from them even if I create small partitions. Older IDE drives are just that: old, so they are probably not the most reliable ones any more. SSDs: There are a few SSDs with IDE interface available. I have not yet tried them. Does anybody have any experience with them? They look like the ideal replacement provided that DOS can boot from them and that writing speed does not deteriorate too much (the old hard disks are no race cars either). Compact Flash: There are adapters for using CF with IDE controllers and they work fine. DOS can boot from them and they have no problems at all with vibrations. What I am not sure about is their durability. DOS uses FAT so some very few sectors are written every time the medium is being written to. IDE to SATA converters: I have no idea whether they are any good. Has anybody tried them? It might be an option to use one of these to connect an SATA SSD to the system. Are there any alternatives that I have missed? (We are working on replacing these systems, but it will still take a few years.)

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• Accessing clearcase view drive from virtual machine is slow

  - by PermanentGuest

  I have a windows XP virtual machine running under a Windows XP host. On the host : On the host clearcase 7.1.1.2 is installed. I have a dynamic view mapped onto some drive. The view has certain VOB/directory structure where my application DLLs from the nightly build and config files are stored. I run my application on the host machine which uses the DLLs and config files from the VOB and everything runs smooth. Now I want to move this set-up to a virtual machine. On the guest : I'm running the guest with a vm-player. I don't want to install clear-case on this as I don't want to expose this machine onto the network. The network setting in the guest is 'host-only'. I have mapped the host's clearcase view drive as a shared folder and I'm able to access this drive from the virtual machine. Also, the application is running. However, the problem is that the access of the clearcase drive from the virtual machine is very slow. I can experience this from the windows explorer. Due to this, the starting of my application takes several seconds in the virtual machine while on the guest it comes up pretty fast. My question is : Is there any way to speed up the performance? I have managed to copy some of the DLLs which don't change frequently to the virtual machine to improve the performance. However, there are still lot of DLLs which have to be taken from the clearcase drive as they change frequently. VMplayer version is : VM Player 3.0.1 build-227600 Both guest and host is : Windows XP service pack 3 Host clearcase is : clearcase 7.1.1.2

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• Turn computer into DAS (Direct Attached Storage)

  - by Damon

  Can we build a direct attached storage by taking a computer/server, adding an HBA, and installing some appropriate software? We would use Debian as a host OS for both the DAS and the server. If so, what software do we use? And do we simply need a HBA for the DAS and the Server? Or do we need more hardware? The goal is to use an older server that does not have enough room for drives but does have ECC memory, server processors, redundant power supplies, dual nics, etc. Then find any boxes, server or not, the key being having enough room for 8-12 drives, fans, etc. and turning them into a DAS; build two of these DAS's and have them connected to the server. Eventually we want to have two servers using DRBD and associated services like heartbeat and pace maker to create an HA setup for our server(s) but that will take a long time to configure since I have no experience with anything related to DRBD (yet) and have a learning curve I have to get past, not to mention the additional cost of more hardware (two servers vs one).

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• Transcoding media server streaming to the iPhone

  - by pilif

  I have a huge collection of videos in different formats, but with one thing in common: They are not playable on an iPhone (or iPod Touch). Instead of complaining about Apple's IMHO broken world view ("there are no video formats but quicktime and mp4"), I wonder if there's a solution out there that allows streaming these different videos to the iPhone. This means that the source media needs to be transcoded on the fly. I already tried a few solutions out there, but with varying success: PS3 Media Server kind of worked, but only once and only for one single file. TVersity is said to work, but it requires UAC to be disabled and I don't see any need for this. The solution I'm looking for should run on Windows 2008 Server or Linux. I just can't believe that there's nothing out there that would allow me to stream my huge video collection on my iPhone (we're talking Wifi here, not 3G). After looking at the answers provided and after retrying TVersity without much success, I gave Orb another try and while the web interface failed to work for me, the iPhone Application (I tried the free one at first) actually worked flawlessly. And not only that, it also manages to convert the streams on-the-fly, so you don't have to wait for the transcoding process to finish before playback starts. On my 2.26 Ghz MacMini Server, this worked even with 1080p material. For Windows 2008 Server users out there: Remember to install the Desktop Experience Feature in the Server Manager if you intend this to work. Of all the stuff I had a look at, this really provided instant-success - even though I'm now probably sending the contents of my harddrive to orb's central server (sigh)

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• Debian 6: setting up FTP just for website editing

  - by David Oliver

  I have a VPS using Debian 6.0. Currently, SSH is set to not accept password logins, and only key-based ones. A person who needs to work on one particular website (a vhost) wishes to use FTP. He doesn't need/want SSH. How can I set up FTP access for him, enabling him to have write permissions for all files in the relevant directory, and only the relevant directory? The directory is /srv/www/domainname.com/public_html Currently, all directories and files in that directory belong to www-data:www-data and are 644/755. I've installed vsftpd and have been reading some guides, but they all seem to deal with allowing multiple users to have their own user-named directories which isn't what I'm after. I can't seem to work out how to simply define one FTP user with a password that has access to one directory of my choosing. This is my first experience of setting up an FTP server. Thanks. Edit: have also found this - maybe I should be using ProFTPd, or can vsftpd also do what I want?

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• Touchpad does not respond when I am holding key on the keyboard

  - by Tadeck

  I am experiencing strange problem with using my touchpad and keyboard simultaneously under Windows 7. I have HP tx2550ew (convertible tablet), and when I hold some key under Windows 7 (eg. space, a, s etc.), the touchpad seems to be blocking. I spotted this while playing Counter Strike. I am not playing much games, and I haven't been playing CS since January, so I am not sure when it started behaving like that. I have tested it also outside the game - when I hold space (eg. when on some web page and entering text into input field) or some letter key, the cursor is not able to move. The problem seems to not be occuring when I hold Shift, Ctrl nor Alt. Did any of you experience similar problem? Do you know what may have caused this? Is there any way I could check what is wrong with my laptop? I have been looking for a solution, but it seems I haven't been looking in right places. This is why I ask question here. Ps. I am unable to test whether this is touchpad-specific, because I have no mouse at my disposal at the moment (got used to touchpad so much I even find it more efficient and haven't been using a mouse with my laptop for months).

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• Create account for service

  - by Andy

  I am configuring a new server. The server is running Hudson that is going to copy some files from this server to another. The other server is a virtual machine. Both running Windows Server 2012. Hudson is started on server A with log on as "Local System". When I come to the copy phase it says "Access denied". Changing the log on to "Administrator" works. However, I guess this is bad. I do not have much experience with user management. I tried to create a own hudson account on both servers A and B. I tried to log on as hudson account in the service-management but it doesn't start. How would you create an account for this particular service that has access to the shared folder on server B and can be used to start the service on server A? I guess I need two accounts with same username and password on server A and server B? The folder on Server B is shared with everyone and the guest account is enabled.

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• Is Hyper-V server suitable as a desktop testbench?

  - by Thomas.Winsnes

  At the moment we are running a test bench with several desktop computers, that are reimaged every time we need to test on a different operation system. Also because different versions of our software is tested on each image, we have to install our software every time we want to test it. The problem we have had with going with a virtualization technology is that our software is depending on directx/opengl and 3D acceleration, and this has not been something that virtual machines have excelled at. With the release of SP1 for Windows 7 and Server 2008 R2 Hyper-V has gotten better 3D acceleration support, so we are looking into virtualizing our testbench using this. Our test scenario would most likely be something close to this: 1. Remote into the hyper-V server and load the test VM needed for the current tests 2. Remote into the VM and install the new version of the software 3. Run the tests It would be nice, but not essential, if our support team could remote into the VMs to match the users OS+software combination when doing support. Does anyone have any experience with this kind of settup with hyper-v?

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• Syncing Google Desktop Scratch Pad

  - by Anders Frey

  I'm a long time user of Google Desktop Scratch Pad and I would like to be able to put the note in the cloud and make it accessible from all my electronic units. I'm working towards changing the filepath Scratch Pad uses to retrieve the .txt to lead to a DropBox folder. As the Desktop Scratch Pad is discontinued I've had no luck in retrieving the API, but what I've got so far is this: The scratch pad data is located at: C:\Users[user]\AppData\Local\Google\Google Desktop\a3d83d5fa2e9\scratchpad.txt The registry keys related to Google Desktop is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop I'm guessing the Scratch Pad app itself is located at: HKEY_CURRENT_USER\Software\Google\Google Desktop\Components I have limited experience with the registry, so I'm not able to translate the binary and hexadecimals, but I'm hoping that the path location is in there somewhere. I've tried using a bunch of other noteapps (including the 'new' scratch pad in chrome) but haven't been able to find one that suits my needs as Desktop Scratch Pad. Hence the effort in this matter. I may be way off and I'm not sure if this is possible to do, but I'm looking forward to hearing your thoughts.

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• Things to check for an internet-facing email server.

  - by Shtééf

  I'm faced with the task of setting up a public-internet-facing email server, that will be relaying mail for all of our other servers in the network. While the software in itself is set up in few keystrokes, what little experience I have with managing an email server has thought me that there are tons of awkward filtering techniques employed by other email systems. Systems that my own server will inevitably interact with a some point. Hence, my questions: What things should be kept in mind and double checked when setting up an email server? What resources are available for checking if my email server is set-up correctly? I'm specifically NOT looking for instructions for any given mail server, such as Exchange or Postfix. But it's okay to say: “you should have X and Y in your set-up, because when talking to server software Z, it typically tries to weed out open relays by checking for these.” Some things I've discovered myself: Make sure forward and reverse DNS are set up. Mail servers tend to do a reverse lookup for the peer IP-address when receiving. Matching a reverse look up with a follow-up forward lookup is probably employed to weed out open relays run through malware on home networks. Make sure the user in the From-address exists. The From-address is easily spoofed. A receiving mail server may try to contact the mail server in the From-domain, and see if the From-user actually exists.

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• Synchronize Active Directory to Database

  - by Tommy Jakobsen

  We are in a situation where we would like to offer our customers to be able to manage their users themselves. It is around 300 customers with up to a total of 10.000 users. Besides creating, updating and removing users, they will very often read information about users for statics and other useful informations available. All this functionality, should be available from an Intranet web page (.NET Framework 4) that the users will access through Citrix or similar. Now the problem is that we would really like the users not to query AD directly for each request, but rather make them hit a database that is synchronized with AD. It would be sufficient to run this synchronization a few time each day (maybe every 5. hour). When they create a user, it should not be available right away, but reviewed and then created within two days (the next step would be to remove this manual review, but that's out of scope for this question). What do you think about this synchronization of AD? Does anyone have any experience with it and is it something that is done in other organizations, where you will have lots of requests which is better handled by a database than AD (I presume)? Are there any techniques out there for writing such a script that synchronizes AD with database tables? My primary concern is the groups/members relations which can be rather complicated. Or are there software that synchronizes AD with a database? Any comments will be much appreciated. Thank you.

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• How to setup port forwarding from my Webserver (apache) to my Database server (mysql)

  - by karman888

  Hello again guys, and thank you for your help so far. Here is my problem: I have two remote dedicated servers, one webserver that runs apache, and one db server that runs mysql. The apache server is visible on the internet of course, but the second server is only visible to the apache server because they are connected with LAN. I need to connect to the remote mysql server through internet from my home-pc , but only apache server is visible to my home-pc. How can i setup port-forwarding from my apache server to the mysql server so i will be able to "see" the mysql server from my home-pc? This question is a follow-up from my first question Connect to remote mysql server from my application. Problem is that Mysql server is on LAN in which you answered me and helped me a lot by telling me to do "port-forwarding". I looked over the internet, and i cant find a good how-to to do port-forwarding. I'm an experienced programmer, but have little experience on hardware and networks. I can understand though what must be done, so i just need a litle help to sort things out :) I hope you can help me guys, Thank you in advance p.s. machine that Apache is running is on CentOS, mysql server also CentOS. p.s2 webserver runs WebHostManager i dont know if that makes any difference or it can be made easily through this, i just mention it :)

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• Photoshop CS5 performance over network drive (cifs)

  - by grub

  Hello Everyone I did install a QNAP NAS TS410 for a customer (professional photographer) with 3 Hitachi Deskstar 7200rpm 2TB disk configured as RAID5. The NAS and the workstations are connected over a Gigabit network. He and his co-worker are accessing the photos (about 1TB of photos) over a mapped network drive from their windows machines (Windows XP - 32bit and Windows 7 Ultimate - 32bit). Both are using Photoshop CS5 to edit the photos. The problem is that to save a edited photo takes a really long time, it takes about 3 times as long to save a photo as to open it. After some tests I can exclude the network, the NAS and the windows machines as source of the issue. I think the problem is the Photoshop software and its handling of the network drives. Officially network drives are not supported by Adobe. I do not have any experience with the Adobe products, especially with Adobe Photoshop CS5. What are your recommendation to solve the performance issue? Should my customer copy the photos to the local drive, edit them and upload them again to the network drive or is Adobe Drive or Adobe Version Cue the answer? One requirement is that the photos need to be accessible / editable from both computers even when one of them is offline. Adobe Version Cue needs a dedicated service running to be usable, so this solution is not possible as far as I understand the Cue software. Thank you for your input to this issue and have a nice day :-) Greetings grub

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