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• ASP.NET sending email through exchange problem

  - by Solmead

  I have an exchange 2010 server running on Windows 2008 R2, I also have a remote webserver running Windows 2003 with multiple sites on it (all asp.net mvc 2 sites). I setup a Transport in exchange and all the websites on my remote web server can send email no problem to anyone in the exchange server and to any external domain. Now for my problem. I am having issues with that webserver, so I moved one of the websites to run on my exchange server, it runs well (low hit website) except that email doesn't work from that site. I tried changing the Transport in exchange to add the IP address of the local machine and the 127.0.0.1 addresses and it still isn't sending any email. Any ideas on how to get this working? The remote websites can still send email no problem, the version of the site that I had to move on the remote server can still email, but on the exchange server for that website email does not send. I would guess it is a Transport issue, since it is running on the same server a firewall shouldn't be the issue. I changed the smtp setting in web.config to localhost, and now I do receive email to my account on the exchange server, but I do not receive any emails on outside addresses. To add more description, this is a custom developed asp.net mvc 2 website. And no errors were being generated in the code when sending the email in either case.

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• Programmer configuring a new network

  - by David Lively

  I'm in the process of expanding my home network from a couple of laptops on a wireless Verizon FiOS router to include: Linksys 24-port switch Cisco Pix 515 Cisco 3640 router One new development desktop and three new machines to act as a db server, web server and a backup system. My company is moving offices and we've decommissioned some older hardware, which I was able to pick up for the cost of the labor to move it home from the office. The benefits to working with dedicated web and db servers are very valuable to me. I know very little about network topology, other than that everything plugs into the switch, which then plugs into the cheap Verizon router. (Verizon provides a coax connection that the router must translate into Ethernet before I can use it with any of this equipment). Questions: What is the recommended topology for this equipment? Verizon router - Pix - 3600 - switch? Is the 3600 even necessary or desirable? The Verizon router has one WAN port and 4 client ports, all 10/100. Is there any performance benefit at all to wiring multiple connections from the verizon router to the switch, assuming I don't use the Pix? Should I use the Pix? Software firewalls are a pain, and seem silly if I have a device like this lying around. Anything else I should know? Am I wasting my time with this? I also obtained a 7 foot rack, shelves, patch panels, UPS, patch panels, etc, which are going into a conveniently air conditioned closet. All constructive advice appreciated.

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• Running docker in VPC and accessing container from another VPC machine

  - by Bogdan Gaza

  I'm having issues while running docker in AWS VPC. Here is my setup: I've got two machines running in VPC: 10.0.100.150 10.0.100.151 both having an elastic IPs assigned to them, both running in the same internet enabled subnet. Let's say I'm running a web server that serves static files in a container on the 10.0.100.150 machine the container: IP: 172.17.0.2 port 8111 is forwarded on the 8111 port on the machine. I'm trying to access the static files from my local machine (or another non-VPC machine also tried an EC2 instance not running in the VPC) and it work flawlessly. If I try to access the files from the other machine (10.0.100.151) it hangs. I'm using wget to pull the files. Tried to debug it with tcpdump and ngrep and that I have seen is that the request reaches the container. If I ngrep on the host machine I see the requests going in but no response going back. If I ngrep on the container I see the requests going in and the response going back. I've tried multiple iptables setups (with postrouting enabled, with manually forwarding ports etc) but no success. Help in any way - even debugging directions would be much appreciated. Thanks!

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• Appears to be "randomly" switching between the acl matched backend and the default backend

  - by Xoor

  I have HAProxy acting as a proxy in front of: An NGinx instance An in-house load balancer in front of multiple dynamic services exposed with socket.io (websockets) My problem is that from time to time my connections are proxied correctly to my socket.io cluster, and then randomly it fallsback to routing to NGinx which obviously is annoying and meaningless since NGinx isn't mean't to handle the request. This happens when requesting for URLs of the format : http://mydomain.com/backends/* There's an ACL in the HAProxy config to match the '/backends/*' path. Here's a simplified version of my HAProxy config (removed extra unrelated entries and changed names): global daemon maxconn 4096 user haproxy group haproxy nbproc 4 defaults mode http timeout server 86400000 timeout connect 5000 log global #this frontend interface receives the incoming http requests frontend http-in mode http #process all requests made on port 80 bind *:80 #set a large timeout for websockets timeout client 86400000 # Default Backend default_backend www_backend # Loadfire (socket cluster) acl is_loadfire_backends path_beg /backends use_backend loadfire_backend if is_loadfire_backends # NGinx backend backend www_backend server www_nginx localhost:12346 maxconn 1024 # Loadfire backend backend loadfire_backend option forwardfor # This sets X-Forwarded-For option httpclose server loadfire localhost:7101 maxconn 2048 It's really quite confusing for me why the behaviour appears to be "random", since being hard to reproduce it's hard to debug. I appreciate any insight on this.

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• x display problems in centos 5.5

  - by John Ruiz

  I have a Dell E510 desktop with a geForce 7200 instead of the ATI x600 it came with. I have attempted to install CentOS 5.4 x86_64 (DVD), CentOS 5.5 (net install), and CentOS 5.5 x86_64 (DVD). Gnome desktop. All of these run into the same issue. When I put the DVD into the machine and reboot, the installer begins and I select "graphical install". I see text that say anaconda is starting, and then my screen goes nuts. It's not black, but rather a screen full of diagonal stripes or multiple colors. So I attempted to do a text install of CentOS 5.5 (DVD) and got it installed. When I booted for the first time, I logged into the virtual console and started X (startx). The desktop came up and it already had the display properties GUI up. I changed it from 800x600 to 1680x1050, saw that there were updates available, installed them, and then rebooted. When I start X from the virtual console this time, I get exactly the same display problem as I described before. Does anyone know what might be causing this and what I can do about it? edit: I should also mention that I'm capable of installing Windows 7 and Ubuntu 10.04 onto this machine with absolutely no issues at all.

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• Need advice on a monitoring, reminder and warning application.

  - by cbmeeks

  I am a developer that also has to monitor several things on different servers. Such as: 1) Did all of the MS SQL databases backup last night? 2) Did all of the MySQL databases backup last night? 3) Were the database dumps actually copied to the right folder? 4) How much free space is left on each server's hard drives? 5) How big are folders "abc", "def", "etc" getting? 6) Send emails/alerts when thresholds are reached Etc. Just basically something to help me NOT forget such important things. I thought about writing something myself but didn't want to waste the effort if something is already out there. I would also prefer one application instead of many if I could. Thanks. EDIT Forgot to mention the operating system. These run on Windows Server 2003 and/or 2008. In fact, what would be cool is a program that supports multiple servers from one machine. Something that can log into those servers.

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• Improving browser performance while using lots of tabs?

  - by Andrew

  My browsing habits cause me to open lots of windows and tabs, either related to different projects I'm working on or things I may want to read later. I use OSX and use about 5 spaces with multiple windows in each space. The problem is eventually I'll have around 200 or more tabs open (spread over 15-20 windows) that I don't want to close. Needless to say, my computer's performance starts to degrade. As I write this on my mobile, Safari on my laptop is locking up the computer. I used to use Chrome but found better performance with Safari. What I'd like to know, is there a graph of browser performance based on tab usage? I don't need a browser that keeps all tabs active. It would be great if the browser could increase performance by "putting tabs to sleep". Or if there was some sort of tool for saving a "workspace" of tabs that you could reactivate the next time you are working on that project. What sort of solution can you recommend to solve this problem?

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• How to install Red Hat Enterprise Linux on Apple Macbook Pro MacBookPro4,1

  - by Todd V. Rovito

  I have a one year old Mac Book Pro that I am trying to get RHEL 5.4 installed on via bootcamp. No matter what I do I can't get the installer to boot. I have tried multiple DVD's and even verified the install works on a new Mac Book Pro. Most of the time the installer simply locks up. I usually use Linux text with all-generic-ide on the boot line. I removed the ide parameter and I just used linux text. The results I get are that a bunch of kernel messages appear then the background turns blue and a thin text box pops up saying its loading ata..... something it disappears too fast for me to read. Then the machine freezes. I pressed the alt function keys to see if I could look at the system log, here is what it says: Alt-f3 says "trying to mount CD device hda" Alt-f4 says status error: hda: lastFailedSense Hda: Failed opcode was: unknown Hda: Lost interrupt Hda: Drive not ready for command Ide-cd: command 0x3 timed out Above this junk it looks like it found the partition because it knew it was 20 GB and listed as /dev/sda3. I think it has something to do with the CD drive, is that possible? Thanks again for the support. PS I posted in the apple support forums ( Apple.com Support Discussions Boot Camp Installation and Storage) and didn't get an answer.

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• Performance associated with storing millions of files on NTFS

  - by Tim Brigham

  Does anyone have a method / formula, etc that I could use - hopefully based on both current and projected numbers of files - to project the 'right' length of the split and the number of nested folders? Please note that although similar it isn't quite the same as Storing a million images in the filesystem. I'm looking for a way to help make the theories outlined more generic. Assumptions I have 'some' initial number of files. This number would be arbitrary but large. Say 500k to 10m+. I have considered the underlying physical hardware disk IO requirements that would be necessary to support such an endeavor. Put another way As time progresses this store will grow. I want to have the best balance of current performance and as my needs increase. Say I double or triple my storage. I need to be able to address both current needs and projected future growth. I need to both plan ahead and not sacrifice too much of current performance. What I've come up with I'm already thinking about using a hash split every so many characters to split things out across multiple directories and keeping the trees even, very similar as outlined in the comments in the question above. It also avoids duplicate files, which would be critical over time. I'm sure that the initial folder structure would be different based on what I've outlined, and depending on the initial scale. As far as I can figure there isn't a one size fits all solution here. It would be horrendously time intensive to work something out experimentally.

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• CPU-adaptive compression

  - by liori

  Hello, Let assume I need to send some data from one computer to another, over a pretty fast network... for example standard 100Mbit connection (~10MB/s). My disk drives are standard HDD, so their speed is somewhere between 30MB/s and 100MB/s. So I guess that compressing the data on the fly could help. But... I don't want to be limited by CPU. If I choose an algorithm that is intensive on CPU, the transfer will actually go slower than without compression. This is difficult with compressors like GZIP and BZIP2 because you usually set the compression strength once for the whole transfer, and my data streams are sometimes easy, sometimes hard to compress--this makes the process suboptimal because sometimes I do not use full CPU, and sometimes the bandwidth is underutilized. Is there a compression program that would adapt to current CPU/bandwidth and hit the sweet spot so that the transfer will be optimal? Ideally for Linux, but I am still curious about all solutions. I'd love to see something compatible with GZIP/BZIP2 decompressors, but this is not necessary. So I'd like to optimize total transfer time, not simply amount of bytes to send. Also I don't need real time decompression... real time compression is enough. The destination host can process the data later in its spare time. I know this doesn't change much (compression is usually much more CPU-intensive than decompression), but if there's a solution that could use this fact, all the better. Each time I am transferring different data, and I really want to make these one-time transfers as quick as possible. So I won't benefit from getting multiple transfers faster due to stronger compression. Thanks,

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• Hardware doesn't work some times

  - by Ali

  I have an Asus n51vf laptop. I bought it not long time ago (less than a month) and installed Windows 7 on it. Since that it wasn't new when I bought it, I don't know, if the problem was occuring before re-installing Windows 7. There are two problems, that might (or might not) have something to do with each other: Problem The less annoying problem is that the screen flickers ONLY on YouTube when scrolling and/or pausing/playing the video or moving the curser over the video. The second more timeconsuming problem is that some of the hardware doesn't work when I turn up the computer. Then I have to reboot the computer and try again. Example: I turn on the computer, and the touchpad doesn't work - I then reboot and it works again. This has so far happened to the screen (leading to a black screen), the keyboard and the touchpad. More frequently the mouse. What have I tried to do so far? I tried reeinstalling the touchpad driver (Synaptic Touchpad driver from Asus Support Page) - didn't help at all. I even tried reinstalling the driver when the non-responding mouse on startup-problem occured (using the keyboard), but it asked me to reboot and didn't help at all. I also installed (and reinstalled) the graphics driver; it's a GeForce GT 130M. Now, the problem never occurs spontaneously - it only appears when booting my computer. I can even use the computer for heavy tasks (games, multiple programs running etc.) with no problem at all. I suspect, that the problem is in some booting mechanism that fails: Maybe the Windows driver loading? Motherboard problems?

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• Setting kernel memory for installing postgresql

  - by Matthieu Taymans

  My question is about setting the kernel shared memory for installing postgresql on mac osx 10.6.8. In the readme file of postgresql it is said: Shared Memory PostgreSQL uses shared memory extensively for caching and inter-process communication. Unfortunately, the default configuration of Mac OS X does not allow suitable amounts of shared memory to be created to run the database server. Before running the installation, please ensure that your system is configured to allow the use of larger amounts of shared memory. Note that this does not 'reserve' any memory so it is safe to configure much higher values than you might initially need. You can do this by editting the file /etc/sysctl.conf - e.g. % sudo vi /etc/sysctl.conf On a MacBook Pro with 2GB of RAM, the author's sysctl.conf contains: kern.sysv.shmmax=1610612736 kern.sysv.shmall=393216 kern.sysv.shmmin=1 kern.sysv.shmmni=32 kern.sysv.shmseg=8 kern.maxprocperuid=512 kern.maxproc=2048 Note that (kern.sysv.shmall * 4096) should be greater than or equal to kern.sysv.shmmax. kern.sysv.shmmax must also be a multiple of 4096. Once you have edited (or created) the file, reboot before continuing with the installation. If you wish to check the settings currently being used by the kernel, you can use the sysctl utility: % sysctl -a The database server can now be installed. I'm a real beginner with all this but need to instal postgresql for academic purposes do you know how i can set this kernel shared memory. Won't that be harmful for my system? Thank you in advance. Matthieu

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• All websites migrated from server running IIS6 to IIS7

  - by Leah

  Hi, I hope someone will be able to help me with this. We have recently migrated all of our clients' sites to a new server running IIS7 - all the sites were originally running on a server running IIS6. Ever since the migration, lots of our clients are reporting error messages. There seems to be quite a number of issues related to sending emails and also, we have had the following error message reported by several different clients: Server Error in '/' Application. -------------------------------------------------------------------------------- Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Web.HttpException: Validation of viewstate MAC failed. If this application is hosted by a Web Farm or cluster, ensure that <machineKey> configuration specifies the same validationKey and validation algorithm. AutoGenerate cannot be used in a cluster. I have read elsewhere that this error can appear if a button is clicked before the whole page has finished loading. But as this error has now appeared on multiple sites and only since the server migration, it seems to me that it must be something else. I was wondering if someone could tell me if there is something specific which needs to be changed for .NET sites when sites are moved from a server running IIS6 to a server running IIS7? I don't deal with the actual servers very much so I'm afraid this is very much a grey area for me. Any help would be very much appreciated.

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• (13) Permission denied on Apache CGI attempt

  - by ncv

  I have recently upgraded my Apache2 server, and am now unable to run a CGI app. My logs are showing (13) Permission denied unable to connect to cgi deamon after multiple tries I understand that the error message means Apache is being denied some permission to some file, and I'm stumped as to how to track down and solve the problem. Is the file mentioned in the error message truly the blocked file? Or might the problem be caused by some other needed file? The .cgi file is right where it has always been, under /usr/share. The file ownership (root) and permissions (world readable/executable) are the same as they have always been for the file and its ancestors. The SELinux file labels are unchanged. The SELinux audit log shows no denial associated with Apache nor the CGI program. In case of a donotaudit condition, I enabled audit, but still saw nothing. I switched SELinux into permissive mode briefly, to no avail. I even tried restarting Apache while in permissive mode. This did not solve the problem. Any suggestions on how to solve this problem? I'm tempted to just revert to the older Apache.

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• download management

  - by Jonathan

  I download many files, usually 2 or 3 a day, often 10ish. Some of them are duplicates because I just can't be bothered to find the original in my downloads folder. I have previously tried DAP and used that to create a new subfolder for each day's download. yet I have found this insufficient as sometimes I wish to find files by name/file type or I have multiple parts of downloads over more than one day. Another problem I have found is zips/rars/etc after downloading them and extracting them I then have the zip and the folder. I like it like on a Mac where it automatically extracts the zip after it has been downloaded and removes the zip. What I'd like to be able to do is sort the downloads by date, but dynamically so they are just in the big downloads folder, but I can just press a button and it will show me all the files from a particular site, or from a particular day or by a certain file type. Is there any software that will do this? I use Chrome as a browser but also have Firefox and like that. Jonathan

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• How to configure a shortcut for an SSH connection through a SSH tunnel

  - by Simone Carletti

  My company production servers (FOO, BAR...) are located behind two gateway servers (A, B). In order to connect to server FOO, I have to open a ssh connection with server A or B with my username JOHNDOE, then from A (or B) I can access any production server opening a SSH connection with a standard username (let's call it WEBBY). So, each time I have to do something like: ssh johndoe@a ... ssh webby@foo ... # now I can work on the server As you can imagine, this is a hassle when I need to use scp or if I need to quickly open multiple connections. I have configured a ssh key and also I'm using .ssh/config for some shortcuts. I was wondering if I can create some kind of ssh configuration in order to type ssh foo and let SSH open/forward all the connections for me. Is it possible? Edit womble's answer is exactly what I was looking for but it seems right now I can't use netcat because it's not installed on the gateway server. weppos:~ weppos$ ssh foo -vv OpenSSH_5.1p1, OpenSSL 0.9.7l 28 Sep 2006 debug1: Reading configuration data /Users/xyz/.ssh/config debug1: Applying options for foo debug1: Reading configuration data /etc/ssh_config debug2: ssh_connect: needpriv 0 debug1: Executing proxy command: exec ssh a nc -w 3 foo 22 debug1: permanently_drop_suid: 501 debug1: identity file /Users/xyz/.ssh/identity type -1 debug2: key_type_from_name: unknown key type '-----BEGIN' debug2: key_type_from_name: unknown key type 'Proc-Type:' debug2: key_type_from_name: unknown key type 'DEK-Info:' debug2: key_type_from_name: unknown key type '-----END' debug1: identity file /Users/xyz/.ssh/id_rsa type 1 debug2: key_type_from_name: unknown key type '-----BEGIN' debug2: key_type_from_name: unknown key type 'Proc-Type:' debug2: key_type_from_name: unknown key type 'DEK-Info:' debug2: key_type_from_name: unknown key type '-----END' debug1: identity file /Users/xyz/.ssh/id_dsa type 2 bash: nc: command not found ssh_exchange_identification: Connection closed by remote host

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• Textmate add multiline text at end of line

  - by Yuval

  In Textmate, I am able to add text to several lines at once by clicking and holding the Option key and dragging with the mouse. say I have the following lines: foo 1: foo 2: foo 3: I can easily click and hold option and then drag down with the lines to select the text at the end of each line, and then type "bar" once and it will be added to all lines, as such: foo 1: bar foo 2: bar foo 3: bar Fantastic. The problem I run into, is when my lines aren't the same length, as such foo 19: foo 37842342346: foo 503: Now if I want to add text to the end of each line, I have to either do it manually, or choose enough space so that the longest line is not overwritten, as such: foo 19: bar foo 37842342346: bar foo 503: bar This results in a lot of unwanted whitespace in lines that don't need it. Granted, I could easily run a regular expression search to replace all multiple occurrences of a space with a single one, but I was wondering if there's a way to select all ending of lines at once without having to do that. Any idea? Thanks!

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• Is there an IE8 setting or policy to make it work like IE7 with respect to persistent connections?

  - by Stephen Pace

  I am working with a commercial application running on XP using IIS 5.1. Periodically the application is returning an IIS error "There are too many people accessing the Web site at this time." This is caused by Microsoft artificially limiting the number of connections (10) under IIS 5.1 under Windows XP, but in this case, there is really only one user (albeit a few tabs open at a time). Microsoft suggests you can reduce the problem by turning off HTTP Keep-Alives for that particular web site: http://support.microsoft.com/kb/262635 If you use IIS 5.0 on Windows 2000 Professional or IIS 5.1 on Microsoft Windows XP Professional, disable HTTP keep-alives in the properties of the Web site. When you do this, a limit of 10 concurrent connections still exists, but IIS does not maintain connections for inactive users. I may do that; however, I'm worried about performance degradation. However, I also notice that IE8 appears to handle this differently than IE7. By default, IE6 and IE7 use 2 persistent connections while IE8 uses 6. Perhaps in this case IE8 itself is generating multiple connections in an attempt to be faster, but those additional connections are overwhelming the artificially limited IIS 5.1 on XP? Assuming that is the case, is there an Internet Explorer option, registry setting, or policy I can set to force IE8 to behave like IE7 with respect to persistent connections? I would not set this for all users, but for the small number of users that used this application, it might solve their intermittent problem until the application can be rehosted on Windows Server 2008. Thanks.

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• Free tiered storage automation in linux?

  - by NginUS

  I have a couple virtualized fileservers running in QEMU/KVM on ProxmoxVE. The physical host has 4 storage tiers with significant performance variances. They're attached both locally and via NFS. These will be provided to the fileserver(s) as local disks, abstracted into pools, and handling multiple streams of data for the network. My aim is for this abstraction layer to intelligently pool the tiers. There's a similar post on the site here: Home-brew automatic tiered storage solutions with Linux? (Memory - SSD - HDD - remote storage) in which the accepted answer was a suggestion to abandon a linux solution for NexentaStor. I like the idea of running NexentaStor. It almost fits the bill. NexentaStor provides Hybrid Storage Pools, and I love the idea of checksumming. 16TB without incurring licensing fees is a huge plus as well. After the expense of the hardware, free is about all my budget can handle. I don't know if zfs pools are adaptive or dynamically allocated based on load, but it becomes irrelevant since NexentaStor doesn't support virtio network or block drivers, which is a must in my environment. Then I saw a commercial solution called SmartMove: http://www.enigmadata.com/smartmove.html And it looks like a step in the right direction, but I'm so broke I'd be wasting their time to even ask for a quote, so I'm looking for another option. I'm after a linux implementation that supports virtio drivers, and I'm at a loss as to which software is up to it.

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• Active FTP client blocked on Windows XP

  - by Ian Hannah

  Summary We have a FTP server (running in active mode). We have an FTP client which is connecting to the server, carrying out a task and then closing the connection. The FTP Client can perform this operation on multiple threads. Problem We have a situation where customers are experiencing occasional failures to carry out operations on a FTP connection. The actual connection has been made to the server but when the server attempts to return data on the data port if fails. Observations We have a simple test FTP client which is running two separate threads. Each thread is performing a recursive listing of files from a root directory. With the firewall running on the client machine the hang happens within a few minutes. If the firewall is turned off on the client machine, the test application seems to run correctly. This does point to a potential firewall issue. However, with the firewall on we can list files on our company FTP server without any issues. If the simple test FTP client runs a single thread then we do not experience any problems whether or not the firewall is turned on. We have another simple test FTP client which was running 4 threads (with each opening a new FTP connection, doing a directory listing and closing the FTP connection as fast as possible) overnight with the firewall turned off. With the firewall turned on it fails in a short space of time. The confusing thing is that if the test FTP client and the FTP server are run on the same machine the failure occurs even though the firewall is turned off. This means that the problem may not be firewall related. Any help with what this could be would be much appreciated. Thanks Ian

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• open source solution to a gateway for a network of a housing cooperative of 150 people

  - by SirDinosaur

  i just inherited a barely functioning network for a student housing cooperative of about 150 people. in it's current state, as i understand it from the previous person in charge of the network, we have working wireless access points and working ethernet cords going to working gigabit switches going to a barely functioning gateway (right now a simple home router) to one of three possible outbound connections. it is possible to connect to the network through the wireless or ethernet, but especially during peak hours, packets / connections are likely dropped or otherwise get no response. my intuition tells me to replace the gateway with something that can handle multiple outbound connections (WAN) and one inbound connection (LAN), while the rest of the network seems suitable for now. i'm somewhat knowledgable in Linux (been using Debian after first Arch Linux) and i want to use as much open source as possible, but i'm confused whether or not a simple server that i could easily understand will work for this situation. do i need specialized hardware to handle the switching more effectively? if so, what are my options? (i found this, thoughts?) or if a Debian server would work, anything else i should about the specs required for this type of server? also links to any useful information on using open source to maintain this type of network would be most appreciated. <3 P.S. crossposted http://redd.it/yybp2.

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• Coffee spilled and went inside CPU...computer not starting

  - by Harpreet

  Today coffee got spilled over my table, and some of it (very less) reached the CPU placed under the table. I think little bit of it got inside the CPU through the front face of the CPU. As that happened the fan started running very fast and made noise. I tried to restart to see if it becomes fine, but the computer didn't start again. First it gave an error of "Alert! Air temperature sensor not detected" and didn't start. Next I tried again multiple times of starting the computer but then it gave some memory error. I was not able to start the computer. Incase there's a problem in hard disk or something related to memory, is there any way we can extract our work or data? I am scared if I am not able to extract my work in case some problem occurs like that. What options would I have? Help! EDIT: I have attached the photo here and you can see the area spilt in red circle. The hard drive electronics have been affected and internal speaker may also have been affected. Any advise on cleaning and if hard drive can work? EDIT 2: Are there any professional services offered to extract data from blemished hard disk, like this one, in case I am not able to run it personally?

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• Mac OS X Disk Encryption - Automation

  - by jfm429

  I want to setup a Mac Mini server with an external drive that is encrypted. In Finder, I can use the full-disk encryption option. However, for multiple users, this could become tricky. What I want to do is encrypt the external volume, then set things up so that when the machine boots, the disk is unlocked so that all users can access it. Of course permissions need to be maintained, but that goes without saying. What I'm thinking of doing is setting up a root-level launchd script that runs once on boot and unlocks the disk. The encryption keys would probably be stored in root's keychain. So here's my list of concerns: If I store the encryption keys in the system keychain, then the file in /private/var/db/SystemKey could be used to unlock the keychain if an attacker ever gained physical access to the server. this is bad. If I store the encryption keys in my user keychain, I have to manually run the command with my password. This is undesirable. If I run a launchd script with my user credentials, it will run under my user account but won't have access to the keychain, defeating the purpose. If root has a keychain (does it?) then how would it be decrypted? Would it remain locked until the password was entered (like the user keychain) or would it have the same problem as the system keychain, with keys stored on the drive and accessible with physical access? Assuming all of the above works, I've found diskutil coreStorage unlockVolume which seems to be the appropriate command, but the details of where to store the encryption key is the biggest problem. If the system keychain is not secure enough, and user keychains require a password, what's the best option?

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• How to route public static IP to a virtual machine on a vmware ESXi host?

  - by Kevin Southworth

  I have 5 static IPs from my ISP (Comcast) and I have a physical machine with VMware ESXi 4.0 on it that is hosting multiple virtual machines. Right now I am just using the default vmware virtual network (vswitch0) with DHCP from the Comcast IP Gateway Router and everything is working fine. Each virtual machine can access the internet, etc. One of my virtual machines is a webserver (Windows Server 2008) and I want to assign it to 1 of my 5 static IPs so it's accessible from the public internet, while leaving the other VMs on the internal LAN still using DHCP. If I just plug my laptop directly into the Comcast IP Gateway (it has 4 ports on the back) and assign my laptop a Static IP using the windows networking dialogs, then I can hit my laptop from the public internet and it works great. However, if I try to do the same steps to set a static IP config on my Windows Server 2008 VM, it does not work. The VM cannot access the internet (open Firefox and try to visit google.com), and I cannnot see the VM from the public internet either. I'm assuming I'm missing something in the ESXi config somewhere, but I'm pretty new to ESXi and I'm not sure how to configure it to work this way.

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• What is the difference between the Linux and Linux LVM partition type?

  - by ujjain

  Fdisk shows multiple partition types. What is the difference between choosing 83) Linux and 8e) Linux LVM? Choosing 83) Linux also works fine for using LVM, even creating a physical volume on /dev/sdb without a partition table works. Does picking a partition type in fdisk really matter? What is the difference in picking Linux or Linux LVM as partition type? [root@tst-01 ~]# fdisk /dev/sdb WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): l 0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT f W95 Ext'd (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 1e Hidden W95 FAT1 Command (m for help):

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