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• How to test a site rigorously?

  - by Sarfraz

  Hello, I recently created a big portal site. It's time for putting it to test. How do you guys test a site rigorously? What are the ways and tools for that? Can we sort of mimic hundreds of virtual users visiting the site to see its load handling? The test should be for both security and speed Thanks in advance.

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• Desktop stops working in Windows 7

  - by Roger

  I'm having an odd problem on one of my Windows 7 machines. At machine startup, explorer.exe is working properly - I can use the Start menu, click on desktop icons, etc. At some later point, though, I lose the ability to interact with desktop icons. I can't double-click to open files on the desktop, and I can't right-click to see the properties window. Oddly enough the Start menu still works properly, and I can still open an Explorer window into my desktop and access everything. I can get around the problem by killing explorer.exe and restarting it using Task Manager, but it's annoying to have to do this over and over. Does anyone have any ideas? I took a look at startup files with msconfig and didn't see any obvious problems. Any suggestions would be appreciated.

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• flash h264 mp4 playback pixelation

  - by ndmweb

  Working with converting/playing h264 mp4 videos in flash. I'm converting the video from various source file formats (mostly .mov & .mp4), to h264 mp4 using ffmpeg server side. All seems to be working just fine, except I'm getting a few reports of pixelation of the video when being viewed on windows machines. I've testing just about every browser I can think of on (XP/Vista/7) and could not reproduce. Here's a screenshot: http://i.imgur.com/IK5RV.jpg (sorry for the resolution, was in an email from the client, as I'm unable to reproduce.) Anyone else ever run into this issue? At this point it could be anything in my mind. It seems like an odd bug, and probably a codec issue, or somehow a 32/64-bit issue?

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• Why does yum index get corrupted?

  - by TomOnTime

  Occasionally yum's cache gets corrupted and we see errors like this: error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages index using db3 - (-30974) error: cannot open Packages database in /var/lib/rpm The workaround is rm -f /var/lib/rpm/__db* and then the next "yum" command regenerates the data. My question is: what is likely to be causing this? Is there some common task that ignores locks or has other problem that causes this? We have hundreds of CentOS machines and there is no pattern to which see this problem. It could be a "one in a million" issue, which at large scale is seen often. NOTE: I realize this is a very "open ended" question, but if an answer finds the cause, I will go back and turn the question into something more canonical that directly relates to the specific issue.

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• Which TCP ports to use?

  - by rowatt

  Is there a TCP port range which I can be sure will not be used by anything else for traffic between two machines? If I am reading RFC6335 correctly, I can be sure that no other applications will use specific ports in the Dynamic/Private/Ephemeral range of 49152-65535. However, if I understand correctly, it also states (section 8.1.2) that an application shouldn't assume that any given port in that range is available at any given time, which would mean I can't be 100% sure that it will be unused all the time. Specifically, I want to assign specific SSH traffic to a different port for the security benefit and so I can classify it differently for QoS purposes, and not have to worry about changing the port in the future.

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• AD password not synchronising properly

  - by Kaczmar

  I have 600+ users in AD, but only one causes me trouble. The problem is I can reset his password from AD, he can then log in to his machine. After that he would like to change his password from Windows 7, and proceeds without errors. Logs out or locks the workstation but cannot access it again using either old or new password. So I have to reset it again and he can only use the one I provide for him. All our machines are in the same physical location in the same subnet. Functional level is 2003. I'm totally out of ideas. I could create him new user account, but I'd possibly like to know what causes this. I can only suspect some sort of synchronisation problems but other accounts work fine, and I don't know how to dig deeper into this. Thanks, Piotr

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• Safari 7 SSL error if using IP-adress

  - by K. Biermann

  I have created my own CA for internal usage and set the root certificate to trustworthy on my machines. With this CA I signed the SSL-certificates for my internal servers. I only address them with their IP and so I used the servers' IP as certificate name. If i connect to the Servers with Chrome or mobile Safari it works without problems, but if I use Safari 7 under Mavericks (on the same machine with the same keychain) i get the following error: "The certificate is not valid (host name mismatch)". I double checked that I entered the correct IP ("https://192.168.2.130"), but I always get the same error. Do I need to enter a different name for the certificate or is it just that Safari doesn't support SSL certificates for IPs? Here is a screenshot of the error message (I can only post images with at least 10 rep): Safari's error message Thanks in advantage and please excuse my bad English :D

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• Creating a portable PHP install?

  - by Xeoncross

  I would like to create a folder with a couple versions of PHP that I can start in cgi mode as needed. I use different windows machines for development and I would like to be able to move around computers without needing to install PHP on each one. Something like below F:/PHP /5.3.2 /5.2.8 /5.1.0 Then I could just start each up as needed with something like F:\php\5.3.2\php-cgi.exe -b 127.0.0.1:9000 Which would allow nginx or apache to use the PHP service. This would really help to make my development environment decoupled. Does anyone know how to create a portable PHP install?

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• Realtime file-level mirroring from local NTFS to network drive

  - by hurfdurf

  We have some data collection machines running WinXP. After a new file is written, we would like to immediately copy the new file to network storage (a NetApp CIFS share) automagically. We need realtime or near realtime copies generated (copy upon filehandle close would be fine -- these are not long-running system logs). Two commercial applications I've found so far are MirrorFile and IBM's Tivoli CDP. Are there any reliable open source programs or simple ways to get Shadow Copy to do something similar? Bonus points if it runs as a service.

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• Getting Started with windows server 2008/2012

  - by hbrock

  First let me say, I am a programmer(not a super star) but I want to get more into the system/network administration side of things. This because there are more jobs for system/network administrators in the area I live. Right now I am using virtual machines to learn how windows 2008/2012 works and to build labs with. But how would I prove to an employer what my skill set is with windows 2008/2012? As a programmer I would point to my past projects, code samples, and so on. Thanks for any help.

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• Windows clients cannot access machine running DHCP server

  - by science9712

  I'm trying to setup a small LAN, using an Ethernet switch, an Arch Linux server, and around 10 Windows XP machines. This network has no outside connections. The Arch machine has a self configured ip address (configured with ip addr add 192.168.0.1 dev eth0), and acts as a DHCP server(using dhcpd). This portion works great, windows clients get IP addresses, the correct gateway settings, perfect. However, the clients cannot connect to each other, or to the dhcp server. When I run ping 192.168.0.1 on any client, I get no response, same happens if I try to ping any other client. On the gateway machine, I can't ping any of the clients either. Any help would be much appreciated!

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• How to implement tail calls in a custom VM

  - by DeadMG

  How can I implement tail calls in a custom virtual machine? I know that I need to pop off the original function's local stack, then it's arguments, then push on the new arguments. But, if I pop off the function's local stack, how am I supposed to push on the new arguments? They've just been popped off the stack.

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• Graceful way to exit a dm_job ? System.exit()?

  - by Ayrad

  If I want to properly exit a documentum java job (if params are invalid for example), should I use a system.exit() or is there another way to do it. As far as I know system.exit closes the virtual machine, does it have an effect on other jobs running?

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• Automatically accept Windows Logo testing?

  - by olofom

  I asked this question yesterday on stackoverflow, but it should be migrated here instead. Since I am not able to migrate it myself and would like an answer as soon as possible I'm reposting it here instead: I am to upgrade a printer driver remotely and has prepared a batch file for this. The only problem is that when I'm installing the drivers I get a popup in which I need to press "Continue Anyway" on. Is there a way to automatically accept this question? I wont be able to go to all the machines that are to be upgraded. The popup:

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• writing to an ioport resulting in segfaults...

  - by Sniperchild

  I'm writing for an atmel at91sam9260 arm 9 cored single board computer [glomation gesbc9260] Using request_mem_region(0xFFFFFC00,0x100,"name"); //port range runs from fc00 to fcff that works fine and shows up in /proc/iomem then i try to write to the last bit of the port at fc20 with writel(0x1, 0xFFFFFC20); and i segfault...specifically "unable to handle kernel paging request at virtual address fffffc20. I'm of the mind that i'm not allocating the right memory space... any helpful insight would be great...

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• Saving small text files is slow over Win Server 2008 R2 VPN

  - by Buckers

  We have a VPN connection to our Windows Server 2008 R2 machine, and the connection works fine. Large files go back and forth fairly quickly, but we use the connection mainly for working on small text files (.aspx, .asp, .php etc). What we find very annoying is that even the smallest of files, there is a noticeable delay of between 2-5 seconds when saving any changes. As we often make changes to code and are constantly saving, this is becoming a problem. Is there anything that might be causing this delay? Or is there anything we can do to speed it up? The connection is definitely not the issue as we have a constant 5Mb upload from our server, and 20Mb+ down on the remote machines. Thanks, Chris.

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• How do I know when my on-board ethernet is dead? (Realtek 8112L LAN controller w/ AI NET2 )

  - by Usagi

  So I have an ASUS P7P55D-E Pro motherboard. It has an on-board Realtek 8112L LAN controller w/ AI NET2. I suspect that my LAN controller is dead but I don't really know for sure. This is what I know thus far: Everything was working, I have a triple booted system and ethernet was functional under Linux, Win7, and OSX. My ethernet is no longer functional under all three of the operating systems. I was experiencing random momentary internet outages before everything finally went dark. I don't know much about the AI NET BIOS tool but I believe it just checks for ethernet problems before you boot into an operating system. In any case, it doesn't find a connection upon boot. I've checked the connection on a couple of other machines and everything worked fine. I think I already know the answer to my question, but are there any other possible explanations, or is it dead?

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• Windows 8 Remote Desktop only allows one user at a time?

  - by segmentation fault

  I tried connecting to Windows 8 using its built-in Remote Desktop feature, but for some inexplicable reason, it requires that no users are logged in on the target machine before a remote user can log in. This has never been a problem with rdesktop on Unixen; I could rdesktop from as many machines as I wanted and any logged-in users would never notice a thing. What's the problem with Windows? Any way to allow concurrent local and remote logins to a Windows 8 machine without hacks or cracks? The "guides" on how to do this that show up in the Google results all suggest replacing a system DLL with a hacked one, but that's not acceptable.

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• Web Content Filtering for Windows Clients

  - by djoyce

  I'm working with a small business to solve a bunch of problems. One is their Windows 7 POS registers need to have web access restricted to only three remote support sites, but the back office machine needs an unfiltered connection. I'd like something I can install and configure on the few registers to block all but those few sites. In a perfect world this would restrict the normal register user, but the admin user would not be filtered. Free is best, if it works, but a small fee would be alright too. Microsoft's Family Safety filter is close, but requires a Windows Live account, which isn't ideal, but may be alright. Anyone use this in a small business environment? I'd prefer something easily managed at the local machines. K9 Web Protection is interesting and I'm going to look into it more. Are there other options? Seems like someone would have made something simple like this as an open source project, but maybe not.

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• uploaded image doesn't change in the browser, although on the drive I have the new image

  - by Omu

  I have a View where I can upload an image and the image is also displayed in there like this: //ResourceStorage is a virtual directory that indicates to the pictures storage location <img src='<%=Url.Content("~/ResourceStorage/Profile/pic.jpg") %>' alt='pic' /> after I upload the picture, on the hard drive I get the new "pic.jpg" but in the browser I still have the old one (I tried clearing the cache, doesn't help)

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• How to make all of my IPs works in HyperVM XEN?

  - by user758667

  I've installed HyperVM on CentOS 5.8 final to make XEN VPS. I have 5 IPs, and added them to an IPPool. They are from *.123 to *.126. But when I add Virtual machines, just the first one (which indicate to *.123 ip) works well. I mean I can ssh to it by "works well" and when I want ssh to the other ones ( *.124 *.125 ...) it says : ssh: connect to host *.124 port 22: Connection timed out after a while. I alos set gateway and netmask as it shows in my server IPAdresses for device eth0 (it doesn't make any difference if I set these or not, I get same error). What should I do now? Thanks.

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• WSUS Updates - Best Practice

  - by What'sTheStoryWishBone

  We have an isolated enviornment of a few hundred servers in which we use WSUS to push updates too. We have thousands of updates which to manage and push to devices testing along the way to ensure the update will not break anything. What are the best practices that you all follow in your enteprise networks to ensure an update does not go out to all the machines that will break something? We currently have ours broken into customized groups for each type of machine. There is one "Test Group" which has one PC of each type which we apply updates to for error checking. Is this a similar procedure others follow or is their an easier safer way to manage the thousands of WSUS updates?

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• Choosing a monitoring system for a dynamically scaling environment: Nagios v. Zabbix

  - by wickett

  When operating in the cloud and scaling boxes automatically, there are certain monitoring issues that one experiences. Sometimes we might be monitoring 10 boxes and sometimes 100. The machines will scale up and down based on a demand. Right now, I think the best solution to this is to choose a monitoring solution that will instantiation of targets via calls to an API. But, is this really the best? I like the idea of dynamic discovery, but that is also a problem in the cloud seeing that the targets are not all in the same subnet. What monitoring solutions allow for a scaling environment like this? Zabbix currently has a draft API but I have been unable to fund a similar API for Nagios. Is there a similar API for Nagios? Anyone have any alternate suggestions besides Nagios and Zabbix?

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• Establish direct cable connection between Windows 8 PCs in home network

  - by Marie. P.

  I'm running two PCs, a desktop and a laptop with Windows 8 Release Preview ("Build 8400"). They are connected to the same router in infrastructure mode, thereby having wireless internet. Due to often file synchronization between the machines I want to establish a cable connection that allows direct file transfer, without needing to use the wireless. When I plug in the cable (normal, not cross-over), I see in "Control Panel\Network and Internet\Network Connections": "Ethernet - unidentified Network" on both PCs. Transferring a file between both still only uses the WiFi via the Router. I noticed that when turning off the wifi on one PC, I can set up a shared internet connection that will work via Ethernet-cable, but since sometimes only one PC runs, sometimes the other one, I do not want to have the internet of one machine to be dependent on the other one being switched on. I do not have a crossover-cable, but since I did connect the PCs already successfully (just without both being on the internet), I'm sure that this should also work with a normal ethernet cable.

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• Mount remote drive by port forwarding

  - by Anushka

  I have a windows 7 computer at home and a remote windows XP machine with an external USB drive attached to it. I would like to be able to copy files to and from home/the remote USB drive. The problem is that the only way of contacting the work computer is by first sshing into a different remote linux machine as there is a firewall that prevents direct internet connection. I can see two possible solutions but I don't know how to do them. Set up winscp using ssh port forwarding via the linux box so that I can copy to and from the two windows machines. I assume that I would need to run an ssh server on the XP machine as well to do this? Mounting the remote USB drive on the remote windows machine from the home XP machine via ssh port forwarding again via the linux box. Does anyone know how to do either solution?

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