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  • Handling timeout in network application

    - by user2175831
    How can I handle timeouts in a network application. I'm implementing a provisioning system on a Linux server, the code is huge so I'm going to put the algorithm, it works as like this Read provisioning commands from file Send it to another server using TCP Save the request in hash. Receive the response then if successful response received then remove request from hash if failed response received then retry the message The problem I'm in now is when the program didn't receive the response for a timeout reason then the request will be waiting for a response forever and won't be retried. And please note that I'll be sending hundreds of commands and I have to monitor the timeout commands for all of them. I tried to use timer but that didn't help because I'll end up with so many waiting timers and I'm not sure if this is a good way of doing this. The question is how can I save the message in some data structure and check to remove or retry it later when there is no response from the other end? Please note that I'm willing to change the algorithm to anything you suggest that could deal with the timeouts.

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  • Error code 0x80070035. The network path was not found

    - by user144606
    My system is connected with a local LAN connection with 30 PC's. I'm not able to access the shared drive in the network, but I'm able to ping the IP address in which the drive is present. I have checked to start all the services, which are to be started and i have check the TCP/UDP ports also, but even after that I'm not able to access the drive, the same error message is being displayed again and again. Please help me to rectify the problem. I'm trying to solve the problem for the last 1 week. I have tried various solutions which are present in various web site, but I'm not able to find a proper solution. So please help me.

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  • How to fix legacy code that uses <string.h> unsafely?

    - by Snowbody
    We've got a bunch of legacy code, written in straight C (some of which is K&R!), which for many, many years has been compiled using Visual C 6.0 (circa 1998) on an XP machine. We realize this is unsustainable, and we're trying to move it to a modern compiler. Political issues have said that the most recent compiler allowed is VC++ 2005. When compiling the project, there are many warnings about the unsafe string manipulation functions used (sprintf(), strcpy(), etc). Reviewing some of these places shows that the code is indeed unsafe; it does not check for buffer overflows. The compiler warning recommends that we move to using sprintf_s(), strcpy_s(), etc. However, these are Microsoft-created (and proprietary) functions and aren't available on (say) gcc (although we're primarily a Windows shop we do have some clients on various flavors of *NIX) How ought we to proceed? I don't want to roll our own string libraries. I only want to go over the code once. I'd rather not switch to C++ if we can help it.

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  • iSCSI drives suddenly inaccessible or corrupted

    - by Hammer1
    I have two NAS (Seagate Black Armors) connected to our network through iSCSI to a Dell Optiplex 760 running 32-bit Windows 7 and Windows iSCSI Initiator. For some unknown reason within the last week both are reportedly inaccessible and/or corrupt (that is the error message generated when I attempt to open the on the iSCSI computer). However, connecting to either of them via direct IP goes off without a hitch. I've tried Error checking but received "The disk check could not be performed because Windows could not access the disk." I've tried System Recover to a date almost two weeks back thinking Windows update may have caused the issue but there is no change. Anyone have an explanation and/or a solution to get them reconnected? Thanks.

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  • How can I run fsck on a disk image via Mac Terminal?

    - by mvizual
    I want to run fsck on a disk image before I use it to restore (replace) a corrupted volume. Using Terminal, what would be the proper command, syntax, and options for this operation? I've just recently become acquainted with Terminal and line commands, so syntax and specific options aren't part of my computing vocabulary. I'm using Terminal 2.1.2, bash, OS 10.6.8. Ultimately, I'm trying to restore an image to a secondary startup volume (external drive). The image is mounted on my desktop and I want to check it for errors before I use it. Disk Utility runs "repair disk" successfully but the integrity of the image is suspect.

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  • Having trouble searching for a ‘.’ using htaccess.

    - by ThisLanham
    I'm setting up a website that (ideally) would allow users to access other users' homepages with a url in the format "www.mysite.com/ThisLanham" where 'ThisLanham' is the username. The username begins with a letter and can consists of any alphanumeric character along with an underscore, hyphen, or period. So far, the redirection has worked perfectly when I ignore usage of the period character. The following code handles that request: RewriteRule ^([a-zA-Z][0-9a-zA-Z-_]*)/?$ Page/?un=$1 [NC,L] However, I've tried a number of ways it check for the period as well, but all have resulted in a 500 Internal Server Error. Here are some my attempts: RewriteRule ^([a-zA-Z][0-9a-zA-Z-\_\\.]\*)/?$ Page/?un=$1 [NC,L] RewriteRule ^([0-9a-zA-Z-\_\\.]\*)/?$ Page/?un=$1 [NC,L] RewriteRule ^([a-zA-Z].\*)/?$ Page/?un=$1 [NC,L] RewriteRule ^(.\*)/?$ Page/?un=$1 [NC,L] also tried... RewriteCond $1 != index.php RewriteRule ^([a-z][0-9a-z-_.]*)/?$ Page/?un=$1 [NC,L] My backup plan is to no longer allow users to include periods in their usernames, but I'd much rather find a solution. Any ideas?

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  • pine sometimes not update new received emails

    - by Tim
    Hi, I am using pine on a KUbuntu linux email server to check my emails. Most of the time when I am under "Inbox", the list of emails is updated automatically so I don't have to do things like pushing the refresh button when I am under web. But sometimes it does not and I have to type "<" to go to the upper level and then select "Inbox" to enter again into the inbox directory to find out that I do receive new emails that are not shown previously. I was wondering what the problem is? Thanks and regards!

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  • Deploy multiple django instances on one Host [migrated]

    - by tvn
    I am trying to setup multiple Django instances on one Host with lighttpd. My problem is to get Djangos FCGI working on subdirectories served by my Webserver. So my aim is the following: www.myhost.org/django0 - django1.fcgi on localhost:3000 www.myhost.org/django1 - django2.fcgi on localhost:3001 www.myhost.org/django2 - django3.fcgi on localhost:3002 Unfortunately the following configuration doesn't even work for one: $HTTP["url"] =~ "^/django0/static($|/)" { server.document-root = "/home/django0/django/static/" } $HTTP["url"] =~ "^/django0/media($|/)" { server.document-root = "/usr/lib/python2.7/dist-packages/django/contrib/admin/media/" } $HTTP["url"] =~ "^/django0($|/)" { proxy.server = ( "" => ( ( "host" => "127.0.0.1", "port" => "3001", "check-local" => "disable", ) ) ) } The only response I get is an 404 and even this takes a long time till I get this. I found nothing suspicious neither in the access.log nor in the error.log.

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  • Windows 8 Metro Applications not working

    - by cgoddard
    I have been using Windows 8 now for the past 2 weeks, and have had some interesting experiences with it. At first, nothing on it worked, but after uninstalling Lenovo One Key Theater, and it worked again for a bit. But then the metro apps stopped working, but after uninstalling Kaspersky, they started working again. But now it is doing it again. Whenever I try to open a metro app, the app screen comes up (lets use store as an example), but the icon and the spinner move from the centre of the screen to the top left, and just spins on for ever and never loads, does anyone know what could be causing it, or at least how to check it? Out of interest, the camera app still works fine.

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  • What is the best appliance you've used?

    - by phuzion
    Post your favorite appliances or "all-in-one" programs. Whether it runs in a virtual machine, or on its own hardware, it all goes. My submission is Untangle. It's an open source network gateway (their term). Essentially, it can run a plethora of things that you may otherwise end up buying another appliance for: Web filtering logging mail spam filtering phishing monitor spyware blocking VPN You name it, it's all there. Best of all, it's mostly free. A few appliances have annual costs due to inherent licensing or subscription costs. If you are looking for a new network perimeter device, definitely check it out. The underlying OS doesn't matter, because it's the application we want to praise, not the OS beneath it.

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  • pine sometimes not update new received emails

    - by Tim
    Hi, I am using pine on a KUbuntu linux email server to check my emails. Most of the time when I am under "Inbox", the list of emails is updated automatically so I don't have to do things like pushing the refresh button when I am under web. But sometimes it does not and I have to type "<" to go to the upper level and then select "Inbox" to enter again into the inbox directory to find out that I do receive new emails that are not shown previously. I was wondering what the problem is? Thanks and regards!

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  • which mail server is better suited for high volume? [closed]

    - by crashintoty
    I'm planning out a project (web/mobile app) that would require a mail server that could handle hundreds of thousands connections per hour (both IMAP/POP and SMTP) and has the ability to interface with PHP (or python or whatever) to dynamically create, delete and check for mailboxes? This is not for spam stuff, I just need my app to generate random mailboxes (and static/permanent ones too) to receive mail and process it for items listed on my service. The little research I've done so far has turned up courier, dovecot, cyrus and haraka. I think the ability to scale and/or load balance (I'm new to these terms, pardon me) would also be a requirement. Any ideas?

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  • Change Exchange Server Name Before Upgrade

    - by ffrugone
    I need to upgrade the Exchange Server from 2003 to 2010. I'm physically changing servers as well as software. I'm worried about redirecting the Outlook clients after the upgrade is going to be troublesome. So, I thought that before doing anything else, that I would change the name of the Exchange server on the client from 'server-name.domain.com' to 'mail.domain.com' and add an entry in dns that points 'mail.domain.com' to the same ip as 'server-name.domain.com'. However, even though I added 'mail.domain.com' to the dns, I cannot get the Exchange server to change to that on the client computers. I found out that the Outlook clients check the Global Catalog for the name of the Exchange server computer. My question is: can I change the Global Catalog address of the Exchange computer from 'server-name.domain.com' to 'mail.domain.com'? If so/not, is there a better way to do this? thanks.

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  • Is it possible to open several web pages when browser is started?

    - by gotqn
    I am searching for browser option or plugin (it will be best if it is available in Web Kit browsers,Opera or Firefox - not IE) that allows me to open several web pages when it is initially started. For example, let's say that I have some file with settings in which I have pointed the following websites: Google + gmail StackOverflow.com SuperUser.com dba.stackexchange.com linkedin etc... and when I firstly started the Chrome browser, all this sites will be opened in new tabs and because the browser has saved my passwords I will be logged in. I will find this very helpful because: It will saves me time I will not miss anything when I turn off my computer (for example to forget to check my mail)

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  • connections on port 80 suddenly refused / server not responding

    - by user1394013
    my dedicated server stopped responding to requests on port 80 today out of sudden, i havent touched anything in more than a month. its ubuntu 10, varnish + nginx + php-fpm, only 1 website. load is at 0. i messaged my ISP if they changed something but no reply yet. i tried to access the site via http://web-sniffer.net/ and it times out on port 80, but if i connect directly to nginx on port 8080 it loads just fine. for normal users, it doesnt load on neither of these in normal browser. any tips what to check or what could be causing this?

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  • Boot failure on Ubuntu 11.04

    - by B Seven
    I was using my laptop with Ubuntu without problem for a few months. I did not update any software or install any OS updates. This morning when it started, I got error: no such device:.... error: no such disk error: you need to load the kernel first. Press any key to continue... Then takes me back to GRUB menu. Both Ubuntu option and recovery mode option show the same thing (above). What does this mean? How do I fix it? Since I did not install anything new, does it mean the SSD is dying (again)? How to check the SSD to and fix any file system errors? Ubuntu 11.04 EDIT: Just remembered something: when the system was shutting down, it did not turn off. There were a bunch of weird output statements, and I assumed the system had shut down so I turned it off with the power button. Perhaps something got corrupted because of that.

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  • How to handle notifications to several partial views of the same model?

    - by Seki
    I am working on refactoring an old simulation of a Turing machine. The application uses a class that contains the state and the logic of program execution, and several panels to display the tape representation and show the state, messages, and the GUI controls (start, stop, program listing, ...). I would like to refactor it using the MVC architecture that was not used originaly: the Frame is the only way to get access to the different panels and there is also a strong coupling between the "engine" class and the GUI updates in the way of frame.displayPanel.state.setText("halted"); or frame.outputPanel.messages.append("some thing"); It looks to me that I should put the state related code into an observable model class and make the different panels observers. My problem is that the java Observable class only provides a global notification to the Observers, while I would prefer not to refresh every Observers everytime, but only when the part that specificaly observe has changed. I am thinking of implementing myself several vectors of listeners (for the state / position, for the output messages, ...) but I feel like reinventing the wheel. I though also about adding some flags that the observers could check like isNewMessageAvailable(), hasTapeMoved(), etc but it sounds also approximative design. BTW, is it ok to keep the fetch / execute loop into the model or should I move it in another place? We can think in a theorical ideal way as I am completely revamping this small application.

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  • Is the community MySQL safe for production use?

    - by n_kips
    Or Will I need to get the enterprise version? This is because I found this on MySQL's site: If you are running a MySQL production level system, we would like to direct your attention to the product description of MySQL Enterprise Edition at: http://mysql.com/products/enterprise/ When I check the features, it seems like the community edition does not support transactions, while the enterprise version does. If it is true that the community edition is not right for production, then it seems like posgresql may be my way out, for it supports transactions and it is fully opensource. Will the sql syntax need to change (much) if I have to change? Thank you.

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  • Four Words That Go Together Well: Oracle. Technology. Network. Lounge.

    - by Oracle OpenWorld Blog Team
    Again this year the Oracle Technology Network (OTN) Lounge will be in the Howard Street Tent, on Howard Street (surprise!) between Moscone North and South. The OTN Lounge is a central meeting place for all Oracle OpenWorld and JavaOne attendees to network with Oracle experts, ACEs, and peers. And to discuss areas of common technology interest - or discuss anything at all. Check out this OTN blog post to get the details on exciting special activities, drawings, and contests happening at the lounge the week of the conference. Stop by - there could be a t-shirt in it for you. OTN Lounge Hours Sunday, September 30    7:00 p.m. - 8:30 p.m.Monday, October 1          8:00 a.m. - 7:00 p.m.Tuesday, October 2         8:00 a.m. - 7:00 p.m.Wednesday, October 3    8:00 a.m. - 5:00 p.m.Thursday, October 4        8:00 a.m. - 2:00 p.m.

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  • Debian Based Server not booting, soon after GRUB screen it restarts?

    - by Krauser
    I have tried running memtest, it start get about half way then abruptly restarts. I assume this is not a problem with the OS itself but rather a hardware issue, I have checked various logs when after about 10 reboots it starts ok, /var/log/kern.log /var/log/syslog /var/log/dmesg All I get is: EXT4-fs(sdc1): re-mounted. Opts: errors=remount-ro restart So I ran fcsk on the drive, to check if the fs was failing and it was fine. Really don't know how to find why the server is continuosly restarting andif I get lucky it will boot up.

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  • Imap subfolders not shown in list command - perhaps acls misconfiguration

    - by mschenk74
    My goal is to copy the whole folder structure with all mails from one imap account to another. The tool I am using for this is imapcopy (the java based version from code.google.com since the unix/linux tool packaged with debian doesn't support imaps). Now, there is one problem: The tool only copies the top-level folders and not the nested ones. To narrow down the problem I have downloaded the source code of imapcopy and debugged into the code. There I noticed that the folder.list() (which is mapped to the list "%" imap command) returns an empty list. But when I do a getFolder(<subfoldername>) I can access those subfolders. After reading some documentation about the features of imap I think that the problem might be some misconfigured ACLs which prohibit the listing of those folders but allow to read ad write to them. How should I check this ACLs? which tools do I need for this task?

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  • compromised site

    - by pinniger
    So, I have a web site that has been compromised twice in two weeks. every index.php and .js file gets a script injecting into the source code of the file. The problem is that I have no idea how they're doing it. I've seen this done via sql injection before, but I don't know how they are actually writing to the file. I've dug through the Apache logs but didn't find anything interesting. The site is built using the cakephp framework on a godaddy shared server. Anybody know what secturity settings or log files to check to see how they are doing this?

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  • Why does Exim puts emails on hold if there are frozen messages in the queue?

    - by user51932
    Hi, I've a CentOS with CPanel server working as a SMTP server, which currently uses 20 different hostnames and IP addresses to deliver email for an email newsletter service. However, it's extremely slow in sending emails. It's sending like 10 emails per minute, which I check by running the "exim -bpc" command. What could be affecting this? One thing I'm supposing, is that there are frozen messages in the queue, which are slowing down the sending until they're sent out, and are putting new messages on hold. What are the most common reasons a message can get frozen? Also, would it be more efficient to use 20 different small VPSs to send out email rather than use one large VPS with the 20 different hostnames and IPs in it?

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  • Random Connections to MySQL refused (Error 111)

    - by joatis
    A Perl/CGI webapp that has been running fine for almost a year has started to randomly been unable to connect to a remotely hosted MySQL. The Error thrown is : Can't connect to MySQL server on 'xx.x.xxx.xx' (111) Reloading the page often solves the problem The client is using Perl, DBI and SSL to connect to MySQL using the same configuration file each time. MySQL 5.0 Server Running RH EL5 Quad-Core AMD Opteron(tm) Processor 2374 HE, 8 cores Real Memory: 15.73 GB total, 11.81 GB used allows networking in my.cnf max-connections are not being met load is low. The servers firewall is open to the client's subnet. The mysql user has permissions from the client's subnet. I have my host looking into the problem but so far we're all stumped as to way the occasional connection is (increasingly getting refused) Any advice what to check that would cause the random refusal of connections?

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  • Prioritize file sharing capabilities in Windows Server 2008

    - by cmbrnt
    I've got a server running Windows Server 2008, and use it mainly for sharing files throughout the domain from a number of disks. It's running on VMware ESXi 4.0, in case that matters. My problem is that when I log in to the server to check user permissions etc, the access speed the files on the remote disks almost grinds to a halt. I havn't been able to measure the speeds, but I would guess it slows down to about 100kB/s as soon as I log in. This is on a gigabit network and the problems are equal for all users, even the ones connected to the same switch as the server. I've assigned 2 GB RAM to the server, and reserved it 1,5Ghz processor power. I don't have to do anything special on the server for this halt to occur. How can I make sure file sharing is prioritized on the server, so no matter what applications I'm using it will always make sure file sharing works properly? Could this be a VMware issue?

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