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• Why are SIP calls via my server silent?

  - by Archcode

  I have FreeSWITCH SIP server up and running. It has public IP and sits behind 1-to-1 NAT (it's Amazon EC2 instance actually). I can connect to it, make a call to other endpoint (namely, my android device to my pc and vice versa) and signals are send with no problems (call, answer, hangup, etc). Unfortunately, and what drives me crazy, that's all: no audio gets through, no video either. Server does not throw errors, it reports many retransmission though, looks like this: switch_rtp.c:915 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=15 Codecs are set up correctly (same config worked locally on my LAN). NAT/firewall on client side may be a problem, signals do get through (perhaps due to fixed port, data streaming runs on random one, that is currently my best bet). STUN/TURN/ICE setting on client seem to have no effect. Endpoints sit behind symmetric NAT. On server there are no iptables rules, security group is set as suggested there: http://wiki.freeswitch.org/wiki/Firewall Help, please. How to make it work or at least diagnose what's wrong?

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• Encrypted Windows 7 & Linux Advice Wanted

  - by Miles

  I would like to set up my laptop to dual boot Arch Linux and Windows 7 with file sharing and encryption. Just wanted some advice on going about this because I have not dealt with encryption nor file sharing. I have two 500GB hard drives, and this is my plan: Install Windows 7 across both hard drives Use a live CD to wipe out Windows boot loader and replace with Grub Legacy Use live CD to wipe out second hard drive and re-size the Windows partition located on first hard drive Install Arch Linux along side with Windows 7 on first hard drive, all remaining space goes to home folder as ext2 Install truecrypt and ext2fsd Concerns: Is this the most efficient way to share files between both OSes? Or should I just be using NTFS to store all my data? How would the file permissions work when sharing files between Windows and Linux? Is there a high likley hood of corruption, and what is the ease of backing up files from an encrypted disk? Anything I should look out for, conflict between Grub and Truecrypt? Thank you for any advice, and feel free to post any links you might find useful to me. I am trying to plan this out so I can minimize downtime as I do not want to spend more than a night on this, nor do I want to run into a major problem some time in the future.

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• Windows 8 install app for multiple user accounts

  - by Robert Graves

  I purchased Adera episode 2 intending to play through it with my son. We each have our own user account on the same PC. When my son logged in, he was prompted to purchase the app which I had already purchased, installed, and played on the same PC. So I checked the Terms of Use. After selecting an app in the store, there is a Terms of Use link on the left side under the Install button. It is almost impossible to identify it as a link unless you put your mouse over it. The Terms of Use are standard across all apps in the store, not specific to particular apps. The terms of use indicates that the app may be installed on up to five devices, but says nothing about multiple user accounts on those devices. However, this Microsoft blog article indicates that it is allowed. Say, for example, that your family has a shared PC. You have previously used your Microsoft account to purchase a game that all your kids like to play. You can install it for each of your kids by having each of them sign in to their Windows accounts on the shared PC, then launch the Store and sign in to the Store using your own Microsoft account. There, you’ll see all your apps and you can re-install the app on your kid’s Windows account. Installing apps on multiple user accounts on a shared PC still only counts as one of the five allowable PCs where you can install apps. So I have two questions: Is it permissible under the Terms of Use to install the app under multiple accounts on the same device? If so, how do I do so given that my son has already signed into the store using his own Microsoft account.

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• Korean characters not appearing in Korean Windows XP computer

  - by user13267

  I am using a Korean software (with a partial English interface) in a Korean Version of Windows XP SP 3 However, in parts of the software, even when I change the interface to Korean, Korean letters show up as random characters, as shown here: This is happening at others parts of the software as well, and I am not sure what is the difference between the places where this is happening, and places where this is not happening. For example, a command button where Korean letters are showing up properly is shown below: This software is a video conferencing software and has a chat feature as well. When I type into the chat box, i can see the Korean letters appear properly at my side, but when I press Enter and send the message, it changes into random characters as shown above in the chat box. What could be the issue here? Could it be a missing font in my computer? Since this is a Korean Windows installation I was hoping everything would work properly by default. What can be done here? EDIT 1: I asked some other people who are using this software, and they think that the problem is at my end, and playing around with the Regional and Language Settings might solve the problem. Also, they suggested I install all the language packs related to Korean display. But it looks like all the language packs have been installed, and my location is set to Korea in Regional and Language Settings in Control Panel, and I still have this problem. Also, I have had similar problems with displaying Korean on an English Windows XP computer. This answer suggested some solutions, but I still do not quite understand exactly what I have to do (at that time I had not fixed the problem, as I later on changed the computer). If I follow that answer, what fonts exactly do I need to install?

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• Linux Distro - GUI similar to Windows

  - by DeaconDesperado

  I am in the process of refurbing several older laptop machines for use by a couple college guys we have in training to learn basic web development in python. These are students who intern at my company and are hoping to do some work when the summer comes building simple client-oriented webapps (learning the basics of OOP, MVC webapp design in flask, etc.). We're trying to function as the "practical" side of their education. I would like to get them set up on these machines we have sitting about, but I'd like to use a linux distro that would have a gui that closely approximates what they are being compelled to use at school (windows.) I don't really have much of a preference as far as GUI goes since much of what we'll be learning together is accomplished on the command line. I just see this as an easier adjustment for them while they are still reliant on a graphical environment. In the past I'd go straight for Ubuntu, but since they started using the Unity GUI the responsiveness overall can be pretty clunky on older machines, especially since these machines (there are four of them) run the gambit on specs (though all are at least 1.0Ghz and none have anything better than basic integrated video.) Has anyone had to setup a similar working environment in Mint, bare Debian or Zorin? Thanks.

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• is there a man in the middle attacking to my server machine?

  - by GongT

  My server works well about half a year. But a strange thing happened (several hours before). This server has two IP-address 58.17.85.19 & 117.21.178.19 When I navigate to http://58.17.85.19, nothing different as before. But http://117.21.178.19 will return a "302 Object moved" and become a "redirect loop" I do some test: ($cmd = "wget http://117.21.178.19/?xx=$RANDOM --max-redirect 0 -S --no-cache -O -") Step by step: run $cmd on my PC and my firend's one (we live in two side of China, far away). - got 302 run $cmd on this server - got 200 OK (content is correct result of index.php) run $cmd on another server in same computer room - got 200 OK telnet from my PC and build an HTTP request (type by hand) - got 200 OK shutdown php-fpm, run $cmd on my PC - got 302 run $cmd on server - 502 Bad Gateway shutdown nginx, run $cmd on both the server and my PC - Connection refused. create iptables rule, refuse any connection to 58.17.85.19:80. run nc -l 80 -k -vvv on server and run $cmd on my PC NC show me that.... Server accept connection (Connection from [my ip]) My connection closed ! (Remove fd xx from list) wget dump out response - got 302 I know that, normaly, NC will accept connection, then dump HTTP request from client, and client will wait for response. this connection will open forever(infact client will close connection becouse timeout), becouse NC can't give any response. So... where my request gone? who send an response to the client? some virus on my server system? If so, why 58.17.85.19 didn't has this error? or... I was attacked by a middleman?

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• AT&T Filtering FTP traffic?

  - by xpda

  Using an AT&T DSL, I cannot ftp upload or ftp download a few files of a large 1500 set. The problem is the file name. I can change a few characters of the file name, and they upload fine. I can change the file names from upper to lower case and they upload fine. If I change back to the original file name, it will not upload again. When it doesn't upload, it starts, transfers about 5% of a 5-10 meg file, and then times out. I have uploaded one of the files under a different name, changed the name back to the original, and it will not download via ftp. It will download onto a browser, and it will ftp download just fine with a different name. It just will not download with ftp. I have reproduced this uploading to three different servers on 1and1 and Amazon EC2. When I try it on a non-AT&T ISP client, it works OK. Here is a file that did not upload until I had renamed it. (I have changed it back to the original name): "http://xpda.com/nautnew/11302 STOVER POINT TO PORT BROWNSVILLE SIDE A.png" This problem is unrelated to connection, speed, and file content. Only things I can see that makes a difference are the file name and ATT DSL. Does ATT have some kind of ftp file filtering? Is there anything else that could cause this behavior?

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• Linksys SFE2000 Interface

  - by boburob

  I have a real problem with a layer 3 Linksys switch. First, every time it looses power, it seems to reset back to an older config. Not only this, but when this happens it looses interface settings on one subnet. This would not be a problem but I am completely unable to get to the interface on the working side. It allows me to log on and then just displays a blank screen. I have tried this on: IE6 IE7 IE8 IE9 Firefox 3.5 Opera Chrome All with the same results, except for Opera, which loads half the interface but nothing I can really use. I really need to get onto this switch so I can sort out routing and VLAN tagged ports, so if anyone has any ideas on either of these issues please let me know ASAP! Thanks! Also, due to its location and my lack of laptops with serial connections I cannot putty into it. UPDATE: Looked into this a bit more and it looks like this model of switch does not save the current config to boot unless you make sure to save it yourself, which explains the first issue, however the broken interface is more worrying!

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• Outlook 2010 PST not indexing

  - by kellyllek

  I've had this problem for months: Outlook is unable to search recent items in the inbox. I was running Outlook 2010 Beta. I've just moved to the Trial version, hoping to solve the issue. I have tons of PST files but one central one I'm mainly concerned with. As of now it seems none of it is indexing. I've been through all the sites and made all the changes; rebuilt the index, changed the name of the PST files, run scanpst, stopped and started the search services, made sure the Windows features under programs and features has the indexing option checked, etc... Status now says 'zero items left to index', and 150,000 have been indexed. I think I have a lot more files than that, and also nothing is showing up on any search. I'm not sure what else to do? Side question. I'm going to be moving out of Outlook. However I have 10Gigs+ of PST files over the years. I want to merge them and make them search-able in the easiest way possible. Any idea on how to do that? Could I even move over to Thunderbird right now and be able to index and search my PST files? Also, Google Desktop won't index Outlook 2010 email either...

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• Installing a new Motherboard in a HP xw6200 case

  - by thing2k

  I have a HP xw6200 Workstation, that is rather long in the tooth, and with 2 physical CPUs, it is quite inefficient. So, the plan was to upgrade the internals. Nothing special: AMD Athlon II X4 640 ASUS M4A78KT-M LE (mATX) 2x 2GB DDR3 1333MHz RAM. 3p under my £150 budget The issues: The pin connector for the front panel isn't a good fit, but I can trim it to size. The PSU has a 8-Pin Power connector, unsurprisingly, the new board has a 4 pin socket. The pins do line up, but I would have to cut it in half to fit. Finally, due to the weight of heat-sinks, they are screwed directly into the case. It turns out that these screws also lock the motherboard in place. As to remove it, you remove the heat-sinks, slide the motherboard across and lift it out. I tested the new board for fit, and while it slots in fine, it's not secure. There is nowhere to screw the board down, it is just held in place with plastic standoffs. The only idea I had, was to wedging something between the side of the motherboard and part of the case. Any suggestions?

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• Network Sniffing and Hubs

  - by Chris_K

  This will likely seem naive to the experts... but it has been on my mind lately. For years I've been using ntop and a cheap 4 port hub to sniff client networks to determine who's doing what -- and how much. Great way to see what's going on when they call and say "Geeze, the network seems really slow today." No need to bring in a managed switch (or access the existing one) and no need to configure spanning or mirroring. I just drop in the hub inline where I want to measure. Lately I noticed it is just about impossible to buy a real honest-to-goodness hub anymore. While looking for a new one, I had someone tell me that I should be sure to get a full-duplex hub or I'd only be seeing half the traffic when I monitor. Really? I've been using a crusty old Netgear DS104 all this time. No clue if it is half or FD. Have I really been understating my measurements? I'm just not bright enough about the physical layer to really know... Side note: Just ordered a Dualcomm Ethernet Switch TAP as a hub replacement. Seems like a nifty gadget. Any notes or tips about it would be welcome in the comments :-)

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• How to track things that SHOULD happen, but might not have

  - by Kamiel Wanrooij

  I am running into a couple of issues with some applications we've deployed and maintain. I have the feeling we have approached this with some anti-patterns up to now, but I would like to see how to make this more flexible and stable. In one situation, we have a server at a client which pushes data to us to parse every night (yes, Windows Task Scheduler). This is highly unstable however, so once every month this doesn't happen because of reasons out of our control. This heavily impacts our business since we run with stale data in that situation. In another scenario we have a lot of background job processes that should be running. We already keep them up using bluepill ( http://www.github.com/arya/bluepill ) but obviously restarts happen, both automatically and manually, and people forget things or systems mess up. What I would like to track is events that should occur or should be available. Like the existence of a process, the execution of a program, or the creation/age of a file, and track it when they don't happen or exist. We develop most things in Ruby on Rails, use NewRelic, Bluepill and Munin, and run on Ubuntu. I've been toying around with counting ps aux | grep processname | wc -l in Munin scripts, or capturing the age of a file and raising alerts over 24-26 hours, stuff like that. Is there better tooling to track things that should happen, and raise alerts if they don't? P.S. I know some things are suboptimal, like manually having to define bluepill for applications and then forgetting to do so. The same goes for the push based approach of the first application, a dedicated daemon that manages that on the client side that we control and can track its connection to us might be a much better solution.

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• NAS for Mac OS X Server

  - by SamAdmin

  I'm using Mac OS X Server and want to allow the users that connect to their network accounts to store their data on a NAS drive. I want the users to connect to the Lion server as this allows for better policies and management for me and for their afp share to be located on a NAS drive. I've looked into home directories and network logins however I don't want the users to connect into a different login environment, just an authentication against their provided account on the Lion server and for their finder to take them to their own storage area - located on the NAS drive. Currently I am using FreeNAS for both authentication and storage however there are getting to be far too many people to manage each afp share and account, plus just using FreeNAS is extremely limiting for expansion and if something goes wrong with 1 entity the entire system goes down. Using the Lion server for user accounts and policies will be much better for this expanding business. I have looked into LDAP, using the Lion server as an LDAP server to authenticate against for FreeNAS however I have had issues with this and thought a different approach could be better from the other side of the situation... Providing the account with somewhere to store data rather than the afp share authenticating against an LDAP server. I am wrong to try it this way? Is it possible to logically add storage to a Mac OS X Server which can be recognised as a local drive, so can be used for network accounts?

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• Euro character messed up during FTP transfer

  - by djechelon

  My customer is using a very outdated ecommerce management system on my hosting service. For that product, no support is being provided anymore by the vendor. Brief explanation: the shop website, that claims to run under LAMP stack, is built by an old Visual Basic Windows application running on MS Access. The user constructs the shop, defines the HTML template, adds products and categories, etc. Then the VB exe builds the PHP pages (one for each template page) and the SQL script to run on MySQL. It also uploads everything via FTP and runs the installation/upgrade script on its own. The problem Browsing the website, many products' descriptions are cut before the euro sign. For example, what was supposed to be "Product price €1000" becomes "Product price" The analysis MySQL contains a cutted description until the € sign, so it's not PHP fault The Access databases contain full description with € sign, so it's not fault of the webmaster writing bad description or eDisplay cutting them The SQL that will run once the site gets uploaded, stored on my local machine before upload, contains the € sign The same script, after being FTPed by eDisplay and opened with nano from SSH, shows the € sign messed up like this: ^À vsftpd log reports (obfuscated for privacy) Sat Dec 15 11:16:57 2012 22 xxx.xxx.128.13 1112727 /srv/www/domains/xxxxxx.it/htdocs/db.sql b _ i r xxxxxxx ftp 0 * c which seems to be a binary transfer (and also a huge security vulnerability because you can download the whole database from unauthenticated HTTP) The eDisplay internal FTP client provides no option for ascii/binary transfer modes [Add] Trying to manually upload the SQL file via SFTP shows messing up euro [Add2] Trying to manually upload using Xftp client with explicit ASCII mode doesn't fix too It looks like the file gets uploaded as binary. Perhaps on the customer's previous host it all worked fine because that was a Windows host. The server It's an Azure virtual machine running openSUSE 12.2 with both vsftpd and openSSH The question Without asking the customer to manually upload files using FileZilla or replacing € with &euro;, because he refuses, what can I do on server side to prevent vsftpd to screw up euro sign?

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• Windows 7 using llt for ipv6

  - by Seoman

  The question asked below is based on the specific implementations of the Os not the RFC. Looking on a way to be able to assign a fixed ip address to a host, before it boots I found that Centos 6 works fine with no modifications and Windows 7 does not work at all. As defined in enter link description here exists 3 valid ways of generate a DUID: 1 Link-layer address plus time 2 Vendor-assigned unique ID based on Enterprise Number 3 Link-layer address Looking at the centos, that works fine, I can see the following autogenerated DUID: option dhcp6.client-id 0:1:0:1:19:60:25:f1:52:54:0:6b:b9:9e; and the MAC address for this host is: ifconfig eth1 | grep HWaddr eth1 Link encap:Ethernet HWaddr 52:54:00:6B:B9:9E As you can see, the DUID containts the MAC address. I can assign a fixed ip address to this host by including an entry on my dhcp server similar to: host vm { hardware ethernet 52:54:00:6B:B9:9E; fixed-address6 2001:db8:0:1::200; if packet(0,1) = 1 { log(debug,"VM Request match!"); } } And the Centos 6 gets his ip. On the windows side, I faced a common problem explained on this other link enter link description here As summary, Win7 uses the option 2 of the DUID generation or a variation of this one. On the link explains how to move it to a llt (link layer + time) but is not working fine. If I modify the DUID to one that looks like the one generated on Centos (but with the right MAC) it works as expected. Question 1 How Can I change the DUID generation for Windows 7 to be based on MAC as Centos 6 does? Thanks

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• Updating files with a Perforce trigger before submit [migrated]

  - by phantom-99w

  I understand that this question has, in essence, already been asked, but that question did not have an unequivocal answer, so please bear with me. Background: In my company, we use Perforce submission numbers as part of our versioning. Regardless of whether this is a correct method or not, that is how things are. Currently, many developers do separate submissions for code and documentation: first the code and then the documentation to update the client-facing docs with what the new version numbers should be. I would like to streamline this process. My thoughts are as follows: create a Perforce trigger (which runs on the server side) which scans the submitted documentation files (such as .txt) for a unique term (such as #####PERFORCE##CHANGELIST##NUMBER###ROFL###LOL###WHATEVER#####) and then replaces it with the value of what the change list would be when submitted. I already know how to determine this value. What I cannot figure out, is how or where to update the files. I have already determined that using the change-content trigger (whether possible or not), which "fire[s] after changelist creation and file transfer, but prior to committing the submit to the database", is the way to go. At this point the files need to exist somewhere on the server. How do I determine the (temporary?) location of these files from within, say, a Python script so that I can update or sed to replace the placeholder value with the intended value? The online documentation for Perforce which I have found so far have not been very explicit on whether this is possible or how the mechanics of a submission at this stage would work.

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• Truecrypt files corrupted after moving PC into another case

  - by Dygerati

  I recently bought a new PC case and transferred all of my PC hardware into it. The only hardware modification was the addition of two identical ram modules. The entire process went smoothly, and everything worked and booted as before. The only side-effect I found when accessing one my of file-based hidden truecrypt volumes shortly there after. Some of the files in the volume - NOT all - seemed to be entirely corrupted. The directory and file names are garbled characters, but a few of the directories in the same volume appear and function normally. Also, all files in the non-hidden tc volume were still intact. Is this not weird? The only other real change I could think of would be that the hard drives were connected to different SATA ports on the mobo. I really don't know how the truecrypt encryption works well enough to know what could cause this...and the fact that not all the files were corrupted makes it more bizarre still. So, first off (and I'm not too hopeful on this point), would it be possible to restore these files? I had a backup of most, but not all of the files involved. Other than that I'm just curious how this happened and how I can prevent it next time. Thanks!

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• Wildcard subdomain setup ... want to change host IP throws off client A records... what to do...

  - by Joe

  Here is the current set up (in a nutshell). The site is set up with a wildcard subdomain, so *.website.com is accessible. Clients can then domain map their own domains with an A record to the server IP address and it will translate the to appropriate *.website.com with re directions and env variables in htaccess. Everything is working perfect... but now comes the problem. The site has grown larger than a single DQC Xeon server can handle at peak times. Looking at cloud options seems tempting, but clients are pointing their domains to a single IP address with the A record (our server). Now, this was probably bad planing from the start, but the question is, if this was to be done today, how would we set it up so that clients use a CNAME perhaps to point their domains to our server rather than an A record. And, if that is not possible for the root domain, how can we then use multiple IP addresses on our side to translate the incoming http request? Complex enough? Hope I've explained it well!

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• Single application through OpenVPN tunnel (Debian Lenny)

  - by user14124

  I'm using Debian Lenny and I want to tunnel rtorrent only through a OpenVPN tunnel. I have a tunnel running, the config file looks like this: client dev tun proto udp remote openvpn.xxx.com 1194 resolv-retry infinite nobind persist-key persist-tun ca /etc/openvpn/xxx/keys/ca.crt cert /etc/openvpn/xxx/keys/client.crt key /etc/openvpn/xxx/keys/client.key tls-auth /etc/openvpn/xxx/keys/tls.key 1 ns-cert-type server comp-lzo verb 3 auth-user-pass script-security 3 reneg-sec 0 My idea is that I could run a sockd proxy internally that redirects traffic to the openvpn tunnel. I could use the *nix "proxifier" application "tsocks" to make it possible for rtorrent to connect through that proxy (as rtorrent doesn't support proxies). I have trouble configuring sockd as my IP inside the VPN changes every time I connect. This is a config file someone said would help: http://ircpimps.org/sockd.conf As my IP changes at each connect I don't know what to put in that config file. I have no control over the host side config file. Any help wanted. Any other method is very welcome.

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• Internet compression proxy for low speed broadband?

  - by user23150

  I live in a rural location, using high-latency wireless off a local ISP's tower. My speed tests vary day to day, but I can get around 1Mb up/down. The problem is, I work with large files, uploading and downloading (HD videos, development software, etc.). It can be painful to wait sometimes. Plus I do some side contract game development, and it can be very difficult to playtest with other developers (200ms ping is a good day for me). Now, obviously it's not going to be easy to solve the latency problem without different wireless hardware. But speedwise, I am wondering if I can use some kind of compression technology on a proxy. For instance, my work computer has full access to a 26Mb down, 10Mb up connection, that is totally unused at night and the weekends. If I could run some kind of compression technology on our server, and use it as a proxy to route to my home computer, I could stand to gain some major speed. I realize that by bogging down a system with compression, I could potentially lose whatever speed gain I had. But the proxy server is a quad core xeon, and the receiving computer is a pretty decent i7 computer, so that shouldn't be a concern. I found http://toonel.net/ but it seems more geared toward very slow narrowband users, like dial-up. Plus, I would prefer to just be able to point my browser to a proxy server, rather then install software on my client machine. EDIT I thought about my question a little more, and realize I am going to need to install software on my client in order to decompress, and possible compress (for uploading). That's not a huge deal.

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• Nexenta, NFS and LOCK_EX

  - by Givre

  I'm currently using an LAMP architecture and I expect a big problem :( I have several http web server using PHP5. All are mounting via NFS (v3) the directory for all the hosted websites. The file server is running the Nexenta Storage Appliance using ZFS . The problem is all the NFS client trying to write something in a file over the NFS get this problem : This is inside the apache2 process: open("/nfs/website1/file.txt", ORDWR|OCREAT, 0600) = 11647 fstat(11647, {stmode=SIFREG|0600, st_size=23754, ...}) = 0 flock(11647, LOCK_EX And the process never get the LOCK and keep waiting for... always. The effect? All the apache2 procces get used and waiting.. my severs can't still proccess the others requests because there is no more proccess available. I don't now where to find a solution.. for me it.'s on the NFS server side.. but wich configuration is wrong or missing ? How can I find what is wrong? If you need more information about the configuration, just ask me what can help you more :)

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• Are there any benchmarks showing difference between hardware virtualisation enabled/disabled?

  - by Wil

  I have a 13" sub-laptop/large-netbook, it has an AMD Athlon Neo X2 L335, and I chose this one because it supports hardware virtualisation. In the end, I hardly do any virtualisation on it, however, when I do... it is fast. To my shock, I went in to the BIOS and saw that virtualisation was disabled! I turned this on and, I see no speed difference.... or at least none that I can tell. I do not have time to do a full set of benchmarks - and I run quite a bit of software on the host, so it wouldn't be scientific. I have searched quite a few places and I just can not find any benchmarks showing the difference of virtualisation bit enabled/disabled on the same hardware. Does anyone have any benchmarks they have seen that they can share? In addition, I know there was an uproar a while ago as Sony disable the hardware virtualisation on some models and only offer it in their higher models as a premium feature, however, apart from forcing an up-sell, are there any benefits to having it disabled e.g. battery/heat? I just can't find any information and can't work out why it would be disabled by default. Edit--- To add, The only thing I can find is that without it, you can not perform x64 virtualisation as fast. This is the only down side I can find. However, if this is the only difference, then I am still interested in the second part of the question - why offer the option to disable it?

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• ESX 3.5 refuses to update

  - by Speeddymon

  I have a set of ESX 3.5 servers in 2 different datacenters. One is DR, one is production. They are on the same vlan and so I can access any of them on the private network from my vCenter server. Last month, as a learning experience (I hadn't dealt with ESX much before), I updated the DR server. Other than finding out that a couple of bundles had to be installed manually in order to get the rest to install from vCenter, it went off without a hitch. Now, I'm trying to do the same for our production servers and it is not working. I've googled around for the error I get during scan, and investigate loads of different solutions (editing the integrity file, checking DNS, etc) -- I did install the 2 bundles that had to be installed manually already -- but scan from vCenter is just not working. Side note: I did just scan the DR server again and that scan works fine so shouldn't be a problem with vCenter that has cropped up recently -- it has to be something else. The error I get is: Patch metadata for (servername) missing. Please download updates metadata first. Failed to scan (servername) for updates. I'm all out of ideas on how to make this work, so any help would be hugely appreciated.

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• How should an experienced Windows SysAdmin learn Linux? [closed]

  - by Systemspoet

  I have a new hire starting in a few weeks who is an experienced Windows SysAdmin. I think he's fairly senior on the Windows side, with a pretty deep AD understanding and experience with Exchange 2007, 2010, and exchange migrations. He's done a little PowerShell but I suspect more of the "run this command to do this" variety then "write a script to do this" sort. However, we are a mixed shop and (he knows this) I expect him to become a reasonably competent Linux SysAdmin over time. I'm looking for good starting points to bring him along. I have over ten years of Linux/UNIX experience, so it all sort of seems intuitive to me, but I've been thinking about the toolkit you actually need to be productive in the Linux CLI world. Just to be able to use the machines at all, off the top of my head... vi Basic CLI stuff -- move around, rename files, copy files, tar, gzip, changing passwords, finding relevant manpages, keep track of where you are, find things in your history, etc, etc. More advanced things that I take for granted but are actually pretty hard -- doing things with 'find', extracting relevant text via 'awk' and/or 'cut', knowing when to use 'grep' and when to use 'grep -e' or 'egrep'. Distribution specific stuff... compiling software, rpm, yum, apt-get, you name it. This all seems pretty basic to me, but when I think back to 1995 when I was first learning my way, some of those things took me years to master. So my question is -- where should I send him to pick up those skills? I'm not just thinking of classes, but rather also websites and books? Where do you all suggest as a starting point for picking up Linux skills?

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• How can I optimize my ajax calls to deliver at 60ms.

  - by Quintin Par

  I am building an autocomplete functionality for my site and the Google instant results are my benchmark. When I look at Google, the 50-60 ms response time baffle me. They look insane. In comparison here’s how mine looks like. To give you an idea my results are cached on the load balancer and served from a machine that has httpd slowstart and initcwnd fixed. My site is also behind cloudflare From a server side perspective I don’t think I can do anything more. Can someone help me take this 500 ms response time to 60ms? What more should I be doing to achieve Google level performance? Edit: People, you seemed to be angry that I did a comparison to Google and the question is very generic. Sorry about that. To rephrase: How can I bring down response time from 500 ms to 60 ms provided my server response time is just a fraction of ms. Assume the results are served from Nginx - Varnish with a cache hit. Here are some answers I would like to answer myself assume the response sizes remained more or less the same. Ensure results are http compressed Ensure SPDY if you are on https Ensure you have initcwnd set to 10 and disable slow start on linux machines. Etc. I don’t think I’ll end up with 60 ms at Google level but your collective expertise can help easily shave off a 100 ms and that’s a big win.

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