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  • Exchange Server is rejecting message after "MAIL FROM" with "500 5.3.3" with tarpit despite being a Trusted Receiver

    - by Don Rhummy
    I'm getting the message: "500 5.3.3 Unrecognized command" from Exchange server and seeing in the Exchange Server logs that it's tarpitting my smtp sender despite the fact that: I added a Receive Connector for my ip that allows connection, uses "Externally Secure" I ran the commands (with the actual server name): CODE: Set-ReceiveConnector "MyTrusted connector (Servername)" -MaxAcknowledgementDelay 0 Set-ReceiveConnector "MyTrusted connector (Servername)" -TarpitInterval 0 Despite all that, it STILL fails! Any idea what's wrong?

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  • Most common account names used in ssh brute force attacks

    - by Charles Stewart
    Does anyone maintain lists of the most frequently guessed account names that are used by attackers brute-forcing ssh? For your amusement, from my main server's logs over the last month (43 313 failed ssh attempts), with root not getting as far as sshd: cas@txtproof:~$ grep -e sshd /var/log/auth* | awk ' { print $8 }' | sort | uniq -c | sort | tail -n 13 32 administrator 32 stephen 34 administration 34 sales 34 user 35 matt 35 postgres 38 mysql 42 oracle 44 guest 86 test 90 admin 16513 checking

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  • How to give a user NTFS rights to a folder, via Powershell

    - by Don
    I'm trying to build a script that will create a folder for a new user on our file server. Then take the inherited rights away from that folder and add specific rights back in. I have it successfully adding the folder (if i give it a static entry in the script), giving domain admin rights, removing inheritance, etc...but i'm having trouble getting it to use a variable I set as the user. I don't want there to be a static user each time, I want to be able to run this script, have it ask me for a username, it then goes out and creates the folder, then gives that same user full rights to that folder based on the username i've supplied it. I can use Smithd as a user, like this: New-Item \\fileserver\home$\Smithd –Type Directory But can't get it to reference the user like this: New-Item \\fileserver\home$\$username –Type Directory Here's what i have: Creating a new folder and setting NTFS permissions. $username = read-host -prompt "Enter User Name" New-Item \\\fileserver\home$\$username –Type Directory Get-Acl \\\fileserver\home$\$username $acl = Get-Acl \\\fileserver\home$\$username $acl.SetAccessRuleProtection($True, $False) $rule = New-Object System.Security.AccessControl.FileSystemAccessRule("Administrators","FullControl", "ContainerInherit, ObjectInherit", "None", "Allow") $acl.AddAccessRule($rule) $rule = New-Object System.Security.AccessControl.FileSystemAccessRule("Domain\Domain Admins","FullControl", "ContainerInherit, ObjectInherit", "None", "Allow") $acl.AddAccessRule($rule) $rule = New-Object System.Security.AccessControl.FileSystemAccessRule("Domain\"+$username,"FullControl", "ContainerInherit, ObjectInherit", "None", "Allow") $acl.AddAccessRule($rule) Set-Acl \\\fileserver\home$\$username $acl I've tried several ways to get it to work, but no luck. Any ideas or suggestions would be welcome, thanks.

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  • What comment-spam filtering service works?

    - by Charles Stewart
    From an answer I gave to another question: There are comment filtering services out there that can analyse comments in a manner similar to mail spam filters (all links to the client API page, organised from simplest API to most complex): Steve Kemp (again) has an xml-rpc-based comment filter: it's how Debian filters comments, and the code is free software, meaning you can run your own comment filtering server if you like; There's Akismet, which is from the WordPress universe; There's Mollom, which has an impressive list of users. It's closed source; it might say "not sure" about comments, intended to suggest offering a captcha to check the user. For myself, I'm happy with offline by-hand filtering, but I suggested Kemp's service to someone who had an underwhelming experience with Mollom, and I'd like to pass on more reports from anyone who has tried these or other services.

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  • Mail.app send mail hook

    - by Charles Stewart
    Is there any way to run a script whenever the user tries to send mail? I'm particularly interested in ensuring that outbound mail doesn't have a blank subject line. Solutions that involve plug-ins are welcome!

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  • Apache httpd.conf handle multiple domains to run the same application

    - by John Stewart
    So what we are looking for is the ability to do the following: We have an application that can load certain settings based on the domain that it is being accessed from. So if you come from xyz.com we show a different logo and if you come from abc.com we show a different logo. The code is the same, running from same server just detects the domain on the run Now we want to get a dedicated server (any suggestions?) that will enable us to point all the doamins that we want to this server (we change the DNS for the domains to that of our server) and then when the user goes to a certain domain they run the same application. Now as far as I can understand we will need to create a "VirtualHost" in apache to handle this. Can we create a wildcard virtualhost that catches all the domains? I am not an expert with Apache at all. So please forgive if this comes out to be a silly question. Any detailed help would be great. Thanks

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  • Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux?

    - by Don MacAskill
    We use RAID1+0 with md on Linux (currently 2.6.37) to create an md device, then use LVM to provide volume management on top of the device, and then use ext4 as our filesystem on the LVM volume groups. With SSDs as the drives, we'd like to see the TRIM commands propagate through the layers (ext4 - LVM - md - SSD) to the devices. It looks like recent 2.6.3x kernels have had a lot of new SSD-related TRIM support added, including lots more coverage of Device Mapper scenarios, but we still can't seem to get it to cascade down properly. Is this possible yet? If so, how? If not, is any progress being made?

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  • Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux?

    - by Don MacAskill
    We use RAID1+0 with md on Linux (currently 2.6.37) to create an md device, then use LVM to provide volume management on top of the device, and then use ext4 as our filesystem on the LVM volume groups. With SSDs as the drives, we'd like to see the TRIM commands propagate through the layers (ext4 - LVM - md - SSD) to the devices. It looks like recent 2.6.3x kernels have had a lot of new SSD-related TRIM support added, including lots more coverage of Device Mapper scenarios, but we still can't seem to get it to cascade down properly. Is this possible yet? If so, how? If not, is any progress being made?

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  • What is some good lossless video codec for recording gameplay?

    - by Don Salva
    I'm an avid gamer and I like to record my gameplay. Usually I've been using Fraps to do it, however I'm thinking of switching to Dxtory as it allows to write on multiple HDDs at once. Say I have 3 HDDs with the following write speeds: HDD1 with 50 mb/s, HDD2 with 22 mb/s and HDD3 with 45 mb/s. Combined write speed would be: 117 mb/s. Dxtory allows you to utilize all 3 HDD's at once while recording your gameplay. Using this formula: RGB24 YUV24: Width x Height x 3 x fps = bitrate (byte/sec) YUV420: Width x Height x 3 / 2 x fps = bitrate (byte/sec) YUV410: Width x Height x 9 / 8 x fps = bitrate (byte/sec) And recording in YUV420 colorspace at 1920x1080 with 30 fps I'd need about 95 mb/s write speed. Dxtory is good because it allows me to play with constant 60 fps while recording in 30 fps. Fraps does not (even though they say it does), once you start recording with Fraps, the game's fps drops. So I'm looking for a codec that doesn't need a very high write speed (bitrate) yet records in good (lossless) quality. Dxtory comes with its own codec, the Dxtory codec. Which allows me some experimentation. Fraps has it's own codec which I can use in Dxtory to expirement around. I also came across http://lags.leetcode.net/codec.html . Are there more lossless codecs out there (besides Fraps' and Dxtory's) which are good for what I want to do? Edit: To clarify, yes, I'm aware a lossless codec always has "good" quality. But that's not what I'm looking for. Let me take the Fraps codec and Dxtory codec to clarify what I'm looking for. When I record with the Dxtory codec in RGB colorspace at 1920x1080 with targeted 30 fps, I can play the game at 60 fps, BUT I'm recording with 10-15 fps, that's because RGB with Dxtory needs much, much more write speed than my hdd can handle. When recording with Dxtory codec in YUV410 colorspace at 1920x1080 with targeted 30 fps, I can play at 60 fps and record at 30 fps, again, that's because YUV410 in Dxtory's codec takes much, much less write speed than RGB When recording with Fraps codec in ??? (I dunno the color space Fraps records in, I guess YUV420), I can play with 60 fps and record with 30 fps. What I'm looking for is a lossless codec that can record in YUV420 (or even RGB??) which does not exceed a write speed (or bitrate if you will) of 100 mb/s in 1920x1080 or in other words, which will allow me to record in constant 30fps. Obviously the best solution would be to buy an SDD, but that's not what I'm after.

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  • Can I see the SMTP session log when Mail.app connects to an SMPT server?

    - by Charles Stewart
    Problem: I've set up a mail server using SASL authentication, and have given Mail.app (on Mac Os 10.4) the login information it needs to connect. I wrote a test message for it to deliver to my server: the Activity window shows that it tries to deliver the message, but then it simply stops, with no indication of error, except that the test message is left in the Outbox. How can I find out what went wrong? Is there some log file I don't know about?

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  • Screen is greyed out after power failure shutdown: Mac OSX

    - by Don MacLachlan
    When the battery power is down and the unit not plugged in the computer is forced into a sleep mode requiring pushing the start button when power is re-connected. The initial desktop screen appears to be greyed out and is unresponsive with a timer bar which, when the timing sequence is complete restores an active desktop. I can't find any reference to this phenomenon in the OSX literature I have. Any pointers to where I can get more information? Perhaps I am using the wrong search criteria?

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  • What's up with stat on Mac OS X/Darwin? Or filesystems without names...

    - by Charles Stewart
    In response to a question I asked on SO, Give the mount point of a path, one respondant suggested using stat to get the device name associated with the volume of a given path. This works nicely on Linux, but gives crazy results on Mac OS X 10.4. For my system, df and mount give: cas cas$ df Filesystem 512-blocks Used Avail Capacity Mounted on /dev/disk0s3 58342896 49924456 7906440 86% / devfs 194 194 0 100% /dev fdesc 2 2 0 100% /dev <volfs> 1024 1024 0 100% /.vol automount -nsl [166] 0 0 0 100% /Network automount -fstab [170] 0 0 0 100% /automount/Servers automount -static [170] 0 0 0 100% /automount/static /dev/disk2s1 163577856 23225520 140352336 14% /Volumes/Snapshot /dev/disk2s2 409404102 5745938 383187960 1% /Volumes/Sparse cas cas$ mount /dev/disk0s3 on / (local, journaled) devfs on /dev (local) fdesc on /dev (union) <volfs> on /.vol automount -nsl [166] on /Network (automounted) automount -fstab [170] on /automount/Servers (automounted) automount -static [170] on /automount/static (automounted) /dev/disk2s1 on /Volumes/Snapshot (local, nodev, nosuid, journaled) /dev/disk2s2 on /Volumes/Sparse (asynchronous, local, nodev, nosuid) Trying to get the devices from the mount points, though: cas cas$ df | grep -e/ | awk '{print $NF}' | while read line; do echo $line $(stat -f"%Sdr" $line); done / disk0s3r /dev ???r /dev ???r /.vol ???r /Network ???r /automount/Servers ???r /automount/static ???r /Volumes/Snapshot disk2s1r /Volumes/Sparse disk2s2r Here, I'm feeding each of the mount points scraped from df to stat, outputting the results of the "%Sdr" format string, which is supposed to be the device name: Cf. stat(1) man page: The special output specifier S may be used to indicate that the output, if applicable, should be in string format. May be used in combination with: ... dr Display actual device name. What's going on? Is it a bug in stat, or some Darwin VFS weirdness? Postscript Per Andrew McGregor, try passing "%Sd" to stat for more weirdness. It lists some apparently arbitrary subset of files from CWD...

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  • What's up with stat on Macos/Darwin? Or filesystems without names...

    - by Charles Stewart
    In response to a question I asked on SO, Give the mount point of a path, one respondant suggested using stat to get the device name associated with the volume of a given path. This works nicely on Linux, but gives crazy results on Macos 10.4. For my system, df and mount give: cas cas$ df Filesystem 512-blocks Used Avail Capacity Mounted on /dev/disk0s3 58342896 49924456 7906440 86% / devfs 194 194 0 100% /dev fdesc 2 2 0 100% /dev 1024 1024 0 100% /.vol automount -nsl [166] 0 0 0 100% /Network automount -fstab [170] 0 0 0 100% /automount/Servers automount -static [170] 0 0 0 100% /automount/static /dev/disk2s1 163577856 23225520 140352336 14% /Volumes/Snapshot /dev/disk2s2 409404102 5745938 383187960 1% /Volumes/Sparse cas cas$ mount /dev/disk0s3 on / (local, journaled) devfs on /dev (local) fdesc on /dev (union) on /.vol automount -nsl [166] on /Network (automounted) automount -fstab [170] on /automount/Servers (automounted) automount -static [170] on /automount/static (automounted) /dev/disk2s1 on /Volumes/Snapshot (local, nodev, nosuid, journaled) /dev/disk2s2 on /Volumes/Sparse (asynchronous, local, nodev, nosuid) Trying to get the devices from the mount points, though: cas cas$ df | grep -e/ | awk '{print $NF}' | while read line; do echo $line $(stat -f"%Sdr" $line); done / disk0s3r /dev ???r /dev ???r /.vol ???r /Network ???r /automount/Servers ???r /automount/static ???r /Volumes/Snapshot disk2s1r /Volumes/Sparse disk2s2r Here, I'm feeding each of the mount points scraped from df to stat, outputing the results of the "%Sdr" format string, which is supposed to be the device name: Cf. stat(1) man page: The special output specifier S may be used to indicate that the output, if applicable, should be in string format. May be used in combination with: ... dr Display actual device name. What's going on? Is it a bug in stat, or some Darwin VFS weirdness? Postscript Per Andrew McGregor, try passing "%Sd" to stat for more weirdness. It lists some apparently arbitrary subset of files from CWD...

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  • I want to install an MSI twice

    - by don.vince
    I have a peculiar wish to install an msi twice on a machine. The purpose of the double install is to first install under the pre-production folder, run the deployment in a safe environment prior to deploying in the production folder. We typically use separate machines to represent these different environments however in this case I need to use the same box. The two scenarios I get are as follows: I've installed pre-production, I'm happy, I want to install production, I run the msi, it asks whether I want to repair or remove the installation I've production installed, I want to install the new version of the msi, it tells me I already have a version of the product installed and I must first un-install the current version The first scenario isn't too bad as we can at that point sensibly un-install and re-install under the production folder, but the second scenario is a pain as we don't want to un-install the live production deployment. Is there a setting I can give to msiexec that will allow this? Is there a more suitable different approach I could use?

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  • Determining a realistic measure of requests per second for a web server

    - by Don
    I'm setting up a nginx stack and optimizing the configuration before going live. Running ab to stress test the machine, I was disappointed to see things topping out at 150 requests per second with a significant number of requests taking 1 second to return. Oddly, the machine itself wasn't even breathing hard. I finally thought to ping the box and saw ping times around 100-125 ms. (The machine, to my surprise, is across the country). So, it seems like network latency is dominating my testing. Running the same tests from a machine on the same network as the server (ping times < 1ms) and I see 5000 requests per second, which is more in-line with what I expected from the machine. But this got me thinking: How do I determine and report a "realistic" measure of requests per second for a web server? You always see claims about performance, but shouldn't network latency be taken into consideration? Sure I can serve 5000 request per second to a machine next to the server, but not to a machine across the country. If I have a lot of slow connections, they will eventually impact my server's performance, right? Or am I thinking about this all wrong? Forgive me if this is network engineering 101 stuff. I'm a developer by trade. Update: Edited for clarity.

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  • Homework with allocate subnet IP address

    - by Don Lun
    I'm having difficulty solving a subnet allocation homework problem. Assume that a university has an address block 128.205.224.0/19. It has to allocate addresses for 2 departments' networks, each of size 1800, and for 4 offices, of sizes 550, 600, 650, and 750 nodes respectively. Assuming that the university network allocates addresses sequentially from the beginning of the allocated allocated address space, what are the prefix allocations for these subnetworks? I first thought in this way: There should be 6 subnets in the network. So I need 3 bits for the subnets. So 3 + 19 = 22 bits should be the network bits. Then there are only 10 bits left. 2^10 = 1024 < 1800, so this cannot work. Could you guys give me a hint or some thoughts for solving this problem?

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  • How important is sender validation, and what matters?

    - by Charles Stewart
    When I started learning how to configure email, SPF existed but there were doubts about whether it was a good thing, and the value of offering SPF records in DNS. Now it seems that it is widely accepted that some form of well-known sender validation is good practice. Is this really true? Am I being a bad postmaster by not supporting SPF/DKIM/whatever?

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  • How to stop my VPS from picking up ARP reqs it is not supposed to?

    - by Charles Stewart
    Machine: Xen-3.0 image running stable Debian Linux 2.6.18, pretty vanilla. My VPS provider asks me to deal with some trouble my image is causing, namely handling IP addresses it is not supposed to: The problem is that your server seems to be configured to use IPs that have not been appointed to you. Your server responds to ARP requests for the IPs 81.171.111.219 and 81.171.111.218. But you are not allowed to use those. Not explicitly, as far as I can tell! At least, nothing under /etc or /var/tmp mentions these IP addresses. But arp -v says something I can't make sense of: Address HWtype HWaddress Flags Mask Iface 81.171.111.1 ether 00:0C:DB:E3:80:00 C eth0 Entries: 1 Skipped: 0 Found: 1 What is it listening to? The possibilities seem to be: It's not my fault: my VPS providers have overlooked something. What might that be? 81.171.111.1 means I'm happy listening in on ARP requests that I shouldn't be: how do I change this? In any case, what does this mean? I'm looking in completely the wrong place for information on what my image is doing. Where should I be looking?

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  • IIS: changing site's home directory while site is running

    - by Jeff Stewart
    I'm trying to understand exactly what IIS 6.0 (on Windows Server 2003) does when I change the "Local Path" of a web site's Home Directory while the site is running. (Specifically with regard to ASP.NET applications.) I'm trying to build support for or against this practice in a deployment scenario: e.g. deploy the new code alongside the old code, then simply switch the IIS web site's local path to the folder containing the new code. IIS seems to handle this gracefully, but I notice that w3wp.exe still keeps some handles on the old code folder after the change. That's strange to me, because I would have expected IIS to recycle the application pool if this happened. Is this safe? Is the behavior well-defined?

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  • IIS URl Rewrite working inconsistently?

    - by Don Jones
    I'm having some oddness with the URL rewriting in IIS 7. Here's my Web.config (below). You'll see "imported rule 3," which grabs attempts to access /sitemap.xml and redirects them to /sitemap/index. That rule works great. Right below it is imported rule 4, which grabs attempts to access /wlwmanifest.xml and redirects them to /mwapi/wlwmanifest. That rule does NOT work. (BTW, I do know it's "rewriting" not "redirecting" - that's what I want). So... why would two identically-configured rules not work the same way? Order makes no different; Imported Rule 4 doesn't work even if it's in the first position. Thanks for any advice! EDIT: Let me represent the rules in .htaccess format so they don't get eaten :) RewriteEngine On # skip existing files and folders RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] # get special XML files RewriteRule ^(.*)sitemap.xml$ /sitemap/index [NC] RewriteRule ^(.*)wlwmanifest.xml$ /mwapi/index [NC] # send everything to index RewriteRule ^.*$ index.php [NC,L] The "sitemap" rewrite rule works fine; the 'wlwmanifest' rule returns a "not found." Weird.

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  • Can I use dmraid instead of md (mdadm) to make software RAID-1 and RAID-1+0 volumes?

    - by Don MacAskill
    On a related question about SSDs and TRIM (see: Possible to get SSD TRIM (discard) working on ext4 + LVM + software RAID in Linux? ), it turns out that dmraid may now (or shortly) support TRIM on RAID-1. Typically, we've used md (via mdadm) to create our RAID-1 volumes, then used LVM to create volume groups, then formatted with the file system of our choice (ext4 lately). We've been doing this for years, and Google & ServerFault searches seem to confirm this is the most common way of doing software RAID with volume management. Google searches seem to suggest that dmraid is use for so-called 'fakeRAID' configurations where there's some level of hardware 'help' in the form of RAID BIOS in the controller, which we don't have (and don't want to use - we'd like a fully software solution). Since we'd like to use TRIM on our SSDs, and since md doesn't seem to (yet?) support TRIM, I'm wondering if it's possible to use dmraid instead of md to create RAID-1 (and RAID-1+0) volumes in software, with no hardware support (ie, just plugged into a dumb SATA/SAS bus)?

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  • Is there a POSIX pathname that can't name a file?

    - by Charles Stewart
    Are there any legal paths in POSIX that cannot be associated with a file, regular or irregular? That is, for which test -e "$LEGITIMATEPOSIXPATHNAME" cannot succeed? Clarification #1: pathnames By "legal paths in POSIX", I mean ones that POSIX says are allowed, not ones that POSIX doesn't explicitly forbid. I've looked this up, and the are POSIX specification calls them character strings that: Use only characters from the portable filename character set [a-zA-Z0-9._-] (cf. http://www.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap03.html#tag_03_276); Do not begin with -; and Have length between 1 and NAME_MAX, a number unspecified for POSIX that is not less than 14. POSIX also allows that filesystems will probably be more relaxed than this, but it forbids the characters NUL and / from appearing in filenames. Note that such a paradigmatically UNIX filename as lost+found isn't FPF, according to this def. There's another constant PATH_MAX, whose use needs no further explanation. The ideal answer will use FPFs, but I'm interested in any example with filenames that POSIX doesn't expressly forbid. Clarification #2: impossibility Obviously, pathnames normally could be bound to a file. But UNIX semantics will tell you that there are special places that couldn't normally have arbitrary files created, like in the /dev directory. Are any such special places stipulated in POSIX? That is what the question is getting after.

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  • Which home automation technology to choose? x10 zwave e.t.c. in UK [closed]

    - by Stewart Robinson
    I work away most of the week and have to leave my house empty. I would like to have home automation monitor and control my house. Naturally I want to be a bit of a geek and do some of it myself so I've researched stuff like x10, zwave, cbus e.t.c. but I want opinions on which I should use in my house. I have a Linux box that could be used to actually do controlling if needed. So which technology and why?

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