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• Postfix - Block email from non-existent local addresses

  - by Kelso.b

  My question is very similar to this one, but for postfix. We keep getting emails from addresses like "[email protected]" delivered to other "@ourdomain.com" addresses. From my google research, I understand it might not be practical to verify the email originated from our IP or VPN (Although this would be ideal, so if you can think of a way to do this, let me know), but in most of these cases the sender address (ex. "accounting") is not a valid account. I imagine there must be a way to make sure that a local account exists before delivering the message.

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• Create network shares via command line with specific permissions

  - by Derek

  This is sort of a two-pronged question. I am developing an application that will need to be able to create network shares in Windows Server 2003 via the command line. So, firstly, how do I create shares in Windows via the command line? I tried researching it, and all I was able to find is that I should be using net, but other than that, there isn't much documentation. Also, in this share there will be a few directories with the names of users on the domain, and I would like for the directories to not be readable or writable by anyone else. For example, say I have two directories: jsmith and jdoe. I would like the user jsmith to write and read from the directory jsmith, but not the directory called jdoe, and vice versa.

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• Exchange 2003 automated mailbox size report

  - by Morris

  I have a question if I may. I have been looking for a while for something that can report user mailbox sizes and percentage used against their quota or something that can warn me when a mailbox is getting close to the quota. I know the user receives a warning but how can I send that same warning a centralized mailbox so we can be pro-active in our support. Either a script or an application that can do this will be helpful. Unfortunately my scripting skills are useless for something this complex. Any ideas of what can be used will be appreciated.

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• FM Transmitter for the Home

  - by greggannicott

  After asking this question regarding piping music through my home I'm looking to buy an FM transmitter. I'd like to connect it to my home pc (ie. into the speaker port), and I'd then control the output with my iPhone (ie. using Apple's Remote software). The problem is, given that almost every FM transmitter is advertised to be used in the car (ie. an iTrip) it's proving very tricky knowing which one would be ideal for the home. First, has anyone tried this? Did it work ok or was there simply to much interference for it work. Secondly, if it did work ok, can anyone recommend a reasonable transmitter? For what I need it seems like an ideal solution, so given that I'm struggling to find information regarding it I'm starting to believe it's not as ideal as it first seems. Thanks in advanance.

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• script to automatically test if a web site is available

  - by Xoundboy

  I'm a lone web developer with my own Centos VPS hosting a few small web sites for my clients. Today I discovered my httpd service had stopped (for no apparent reason - but that's another thread). I restarted it but now I need to find a way that I can be notified by email and/or SMS if it happens again - I don't like it when my client rings me to tell me their web site doesn't work! I know there are probably many different possibilities, including server monitoring software. I think all I really need is a script that I can run as a cron job from my dev host (which is permanently running in my office) that attempts to load a page from my production server and if it doesn't load within say 30 seconds then it sends me an email or SMS. I'm pretty rubbish at shell scripting, hence this question. Any suggestions would be gratefully appreciated, thanks to all you clever sysadmin guys and girls out there :)

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• dell studio 1558 multi touchpad multi finger problem

  - by christian130

  Recently I bought an Intel Core i7 Dell laptop fully integrated. I have an ATi Radeon 1 gb ram graphic card and so on. Everything works fine even the brightness, but when I try the multi touch multi finger(touchpad which enables two or more finger) the pointer jump and go there and go here and so It's very annoying because when I'm trying to write this question I cannot let the pointer be cool! when I accidentally the touchpad it is very annoying. How can I fix this ?

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• Can you plug-in the battery while laptop is on AC only?

  - by Ivan Petrushev

  Hello, I'm using my laptop at home with battery removed and only connected to the AC power. However I'm lacking the mobility as my power cord is kinda short. Is it safe from electrical point of view to plug in the battery while the laptop is connected to AC and disconnect the AC power afterwards? What about the opposite side of the question - is it safe (or what the damage could be) if you work on battery, plug in the AC and unplug the battery? If there are differents for different models of laptops, I'm asking about IBM Lenovo T60. Is there such thing as a 'hot-plug battery'?

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• Do two portforward rules translate to "and"?

  - by blsub6

  I just set up an Exchange server to replace my DeskNow mail server. I want to start testing my internet mail exchange of my Exchange server. I can only set the MX records on my DNS up to my one external IP address so I was thinking that I could set up a firewall rule on my internet-facing firewall that port forwarded the smtp packets to two different servers. My question is: If I do that, will that mean that the smtp packets will be forwarded to just the first internal IP on the list? Or does it mean that the packet will be cloned and sent to both IPs?

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• Macbook superdrive got calibration problems

  - by Fractal

  I have an intel macbook dual 2Ghz, bought about three years ago. I've had some problems with the superdrive and changed it a year and a half ago. the drive is Matshita DVD-R UJ 857 now I'm into burning cd's again and try to burn a DVD with Toast Titanium from an .iso on my hard drive But it won't work. When I launch the burn, the disc suddenly stops turning, and an error log pops: medium error, sense code = 0x73, 0x03 then I try with the built in cd burner of the macbook as soon as I click burn, the cd stops turning in the drive, and error log says peripheral couldn't calibrate power of the laser required for medium so since I'm not that logical of a geek, I try my first idea: let's see with other brands of DVD! the problem is that it works, now. but I'd like for all of my medium to be usable, and I've already seen my ridata DVD being burn, so here's the question. What the hell is happening with my superdrive? :)

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• Justifying a memory upgrade, take 2

  - by AngryHacker

  Previously I asked a question on what metrics I should measure (e.g. before and after) to justify a memory upgrade. Perfmon was suggested. I'd like to know which specific perfmon counters I should be measuring. So far I got: PhysicalDisk/Avg. Disk Queue Length (for each drive) PhysicalDisk/Avg. Disk Write Queue Length (for each drive) PhysicalDisk/Avg. Disk Read Queue Length (for each drive) Processor/Processor Time% SQLServer:BufferManager/Buffer cache hit ratio What other ones should I use?

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• Shrink system volume, create new partition, & enlarge current partitions w/o losing data?

  - by studiohack

  My machine has a 300 GB hard drive. I'm planning to reinstall Windows 7 on this machine soon. It has three partitions: a System partition, and two equal data partitions for particular types of data (music, photos, docs, etc). These data partitions are too small for the data they hold, and the system partition is large enough to be shrunk. I want to create four partitions in preparation for the fresh reinstall, a System partition, and three data partitions of varying sizes (40, 50, & 60 GB respectively). My question: Can I shrink the System volume, create another partition, and make the existing two data partitions bigger without losing any data that is currently on the hard drive? Or is it better to format the whole thing, and create partitions after (thus removing the current OS) with a partitioning tool booting from CD? Can I reformat and create partitions with the Windows 7 set up DVD?

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• How to remove duplicate illegal site in apache configuration?

  - by zladuric

  I've recently found a referrer in the apache log on my site. Now, I opened it out of curiosity, since my site is live, but I just started development so I didn't expect it. Anyway, the site was a pure copy of mine, and after investigation I saw that it resolves to my IP. I'm on Ubuntu 12.04, Apache 2, drupal 7, don't know what other info can I provide. My question is: how can I tell apache that it should not serve this site? Thanks Edit: forgot to say that I had some bots register to my fresh drupal installation. Also, my domain is a tld, this fake domain is a third level (ie. sub.domain.de)

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• How to remove the dlinksearch browser search hijack

  - by Bish

  Hi Gang, For the last few weeks all the machines on my home network are having the same problem whilst browsing the internet. When the user enters an invalid URL in the browser address bar, instead of the default browser behaviour, the request is sent to http://www1.dlinksearch.com/. As far as I can tell this is all machines and all browsers. It is so consistent I am wondering whether it has anything to do with our router. We use a DLink DIR-655 router so maybe the clue is in the name :) Anyhow, I cannot figure out how to disable/remove the offending behaviour. I've checked hosts files, spyware, AV etc. etc. Anybody have any ideas? Paul P.S. Apologies if this is not the right place to ask this type of question. I'm a bit stuck

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• Windows media player 12 not launching from custom program

  - by Supertrolly

  There is a program we use for testing that calls windows media player and plays a media file. The problem is that windows media player fails to load unless you open and close it before starting the program. After that the program will open it every time without a hitch but after a reboot it is lost and you must do it again. My question is what could be voilate setting could windows media player have that would be lost on a reboot? I have tried programs like Regshot to capture changes to the registry that might be delated on reboot. The code for the program is very straight forward simply calling windows media player with a parameter with the media to play. Using process montior I have determined that is is crashing shortly after the program executes it. I am at a lost on this problem as I can not find what if anything it is changing to run windows media player.

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• How to determine the best byte size for the dd command

  - by James

  I know that doing a dd if=/dev/hda of=/dev/hdb does a deep hard drive copy. I've heard that people have been able to speed up the process by increasing the number of bytes that are read and written at a time (512) with the "bs" option. People have suggested that the optimal byte size is due to sector size. I personally think it would have something to do with the amount of cache that the hard drive has. My question is: What determines the ideal byte size for copying from a hard drive? and Why does that determine the ideal byte size?

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• Move the mouse without clicking using a touchscreen

  - by rubo77

  In many occasions you have to move the mouse over an area of the screen or an element in an interface without clicking on it. is there a way to achieve this? I use windows 8.1 on a Lenovo Yoga Pro 2 with a touchscreen. I already managed to remap the windows key to a right mouse button with AutoHotkey, but that's another question. Maybe it would be possible to catch a gesture or something like that, that would disable the clicking of the mouse when you move the finger over the touchscreen?

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• How Can I Edit Google Chrome's 'History Provider Cache' File?

  - by dissolved

  I'm interested in editing (not completely deleting) contents of some of Google Chrome's cache files. In particular, the 'History Provider Cache' (found in ~/Library/Application Support/Google/Chrome/Default on Mac). As this other question suggests, it appears to simply be a SQLite file. Unfortunately, when I try to open it using a SQLite browser (MesaSQLite) I'm asked for an encryption key. So, I'd welcome any suggestions on how to either (1) determine the encryption key, or (2) an alternate way to edit this file. The end goal is to be able to remove specific annoying suggestions in the Omnibar. I've read countless other techniques, but none seem to remove suggestions that have the clock icon next to it. Some say deleting this file entirely will do the trick (and I imagine it will), but I don't wish to trash my entire browsing history. I find most of the suggestions to be useful and helpful, and I'd like to preserve that.

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• Explorer forgetting how to cut and paste files

  - by raimesh

  My Windows XP (SP3) machine (at work) occasionally "forgets" how to cut-and-paste files in Explorer - if I cut or copy a file then go to paste it elsewhere, the "paste" and "paste shortcut" menu items are greyed out. The keyboard shortcuts (Ctrl+X/Ctrl+C,Ctrl+V) don't work either, and neither does Drag-and-Drop - clicking and dragging a file/folder doesn't change the pointer and letting go doesn't drop the item anywhere. Restarting the explorer.exe process usually fixes the problem, but sometimes I need to do a full reboot. Note: this may be related to the following existing question, although that's Vista and it sounds like the asker has more permanent problems than I do: http://superuser.com/questions/27045/copy-paste-in-vista-explorer-broken-not-ms-vpc So, any idea what might be causing the problem and how to avoid it?

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• How to use psexec without admin privileges on target machine?

  - by HighCommander4

  Is it possible to use psexec to execute a command on a remote machine without having admin privileges on the remote machine? I tried running psexec \\<machine> -u <username> -p <password>, where <username> and <password> are non-admin credentials, but I get an "access denied" error I can remote desktop into the remote machine with the same credentials without any problems. My local machine is running Windows 7 Enterprise 64-bit, and the remote machine is running Windows Server 2008 64-bit. I do have admin privileges on the local machine. EDIT: To all the people who are downvoting this question: I am not trying to circumvent any sort of security measure. I can already run the process on the remote machine by remote desktop-ing into the remote machine and running it. I'm simply looking for a command-line way to do something I can already do through a GUI.

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• Should I limit end-user gigabit ports to avoid saturating uplink/trunk connections?

  - by Joel Coel

  We have a campus with 16 buildings and older 850nm 1Gbps fiber links between the buildings, that all come to a core switch for our servers that also uses 1Gbps ports. We're finally starting to replace our aging 10/100 end-user switches, and much of what we're looking at are 1 Gbps units. My question is, since the trunk/uplink lines are still 1Gbps, if I were to install 1 Gbps switches for end users, should I limit the ports to 100Mbps until I can also upgrade the trunks to avoid allowing a bad-behaving host to saturate a trunk line (since we're a college, we have plenty of mis-behaving hosts) and thereby create a DoS situation for a building, or will TCP congestion control typically take care of that for me? What if we have a lot of UDP traffic (games, video chats, even a small amount of bittorrent)?

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• Setup IPv6 over IPv4 tunnel in VPN

  - by bfmeb

  Let me explain my szenario: I have a linux server A. A is reachable in a VPN. So if I am connected to the VPN over Internet I can successfully ping A. Server A is connected to a Router B. Router B has a local ipv6 address and there are resources (each of them with a local ipv6 address) connected to Router B. After I am connected to VPN, I am able to use ssh to have access over A. Now I can use the ping6 command to ping the Router B or one of its connected resources. This works fine. The ping fails if I try to ping router B on my computer. Overview: My Computer -- VPN -- Server A(ipv4) -- Router B(ipv6) -- Ressource A(ipv6) On resource A runs for example a HTTP-Server. My question is: How can I access Resource A (for example with HTTP) on my to VPN connected computer? Is it possible? Should I setup a tunnel device? Sorry for this inexpertly explanation, but I am new to network stuff!

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• Recovering mail from hardrive (broken os).

  - by Maciek Sawicki

  Hi, Friend of mine broke his Windows (doesn't boot). I will probably have to reinstall OS. I want to mount his hard drive in my OS to beck up some important files. He sad he uses Outlook express, but he Use Vista so I'm not sure it's Vistas Mail Client or Outlook. What files I have to copy to backup mail and adders book from Outlook, Outlook Express and Windows Mail? Is it any good program for doing it automatically (for Linux or Windows)? If there are tools or special procedures for other mail clients (for example Thunderbird) you can also name them to make this question more generic.

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• Is it possible to dynamically adjust the priority of outgoing emails?

  - by davethegr8

  This is more of a theoretical question, but is it possible to dynamically, and on an ongoing basis, adjust the priority of emails in the mail queue? For example, for all mail, set it's priority (p) to 1 (meaning send immediately). If N emails in the last M share similar or identical content, adjust the priority of this email such that it's priority is in the range [0..1] so that p is equal to 1 - N/M and other email can get sent before the similar/identical stuff. Or, if you have another idea or standard what is it? Some background: Someone put a mail() call in an infinite loop... And now we have to wait for the mail queue to catch up before anyone can send or receive mail again.

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• IIS7.5 App Pool recycling. What is the best schedule for Recycling

  - by mikedopp

  I have been using IIS7.5 Since its release. I am also using commerce server 2007sp2. Due to Commerce Servers Need for memory and processor I have the app pool the website is assigned to recycling at midnight every night. My Question is what is the best time table to recycle heavy web app pools? I am looking to keep speed and not bump potential customers while recycling multiple times a day if possible. Another issue is that every few days the same app pool will hang and I have to force a reset of IIS to get it working again.

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• Stuck on Login PhpMyAdmin

  - by TMP

  Hi. I've isntalled phpmyadmin via apt-get. I've set the apache env-vars to the correct user:group. I've set ownership of /etc/apache2 and /etc/phpmyadmin to this user:group. I've restarted both apache2 and mysql several times. My Problem: When I access [ServerIP]/phpmyadmin I get the login screen, I enter the information, and i'm right back at the login screen, with not even an error "permission denied" or "password wrong" or whatever. The only things thats different is the URL: Instead of the Original http://[ServerIP]/phpmyadmin/index.php I am now at http://[ServerIP]/phpmyadmin/index.php?token=[Long Hex string here] However, still the login dialog. My Question: How Do I fix this?

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