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• Input traffic shaping

  - by whitequark

  I know that I can shape output traffic with tc or a similar tool. However, I want to shape the input traffic now—actually, I want to prioritize downloading of files of certain type through a slow lossy connection. I know the reason tc can only shape output traffic: the host itself has no direct control over the amount of input traffic. On the other hand, TCP has some measures built in it which prevent the TCP traffic from overflowing a slow connection. So, can I mangle something in TCP header so that the remote host will think my connection is slower than it thinks? Suppose that I am able to set the corresponding mark on both types of connections with iptables. Is there any way to reduce the input bandwidth of connections of first type, but only if connections of second type are present?

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• Will Hotmail DELIVER to spam-friendly ISP?

  - by Oddthinking

  I have a user who is using Hotmail to communicate with one of our suppliers. Recently, Hotmail started bouncing emails to that address (while other ISPs are working fine.) Hotmail bounce messages contain very little details. Investigating, I found that the supplier's ISP has appeared on a blacklist of ISPs who do not do enough to prevent spamming from their users. (Note: Neither my user nor the supplier are mass-mailing.) In the circumstances, I can understand Hotmail declining to accept emails from the host, or accepting them but being quick to mark them as spam. However, I am surprised that they might refuse delivery. Does this sound plausible to you, or am I barking up the wrong tree?

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• Is it possible to extend a 504 timeout in nginx on a per location basis

  - by codecowboy

  Is it possible to set timeout directives within a location block to prevent nginx returning a 504 from a long running PHP script (PHP-FPM? location /myurlsegment/ { client_body_timeout 1000000; send_timeout 1000000; fastcgi_read_timeout 1000000; } This has no effect when making a request to example.com/myurlsegment. The timeout occurs after approximately 60 seconds. PHP is configured to allow the script to run until completion (set_time_limit(0)) I don't want to set a global timeout for all scripts.

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• frequent errors with subversion repository on fat32 on USB memory stick

  - by sal

  I keep a copy of a Subversion Repository on a USB memory stick that is formatted with FAT32. I am using TortoiseSVN on XP and command line svn 1.6.x on Ubuntu and OSX with this memory stick. I notice that I need to do an svn cleanup just about every time or updates and commits will not work. I routinely have errors with .lock and *.svn/text-base/** files getting corrupted. Errors tend to be parameter is incorrect or lock file can not be read Sometimes svn cleanup works and sometimes chflags -R nouchg * Is there anything I can do to prevent this?

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• My BrowserHelperObject is detected by avg as a malware, what is going wrong.

  - by BHOdevelopper

  Hi i'm building a BrowserHelperObject in c++ for Internet Explorer 8. It is a friendly add-on that gives you fonctionalities in a sidebar. The thing is that when you download the add-on executable from the web, AVG (AntiVirusGuard) detects the executable file as a malware. I did a lot of research and i can't find a way to not being seen as a bad malware. I know that BrowserHelperObject are often seen as malware, but mine is just a good and friendly add-on. Does anyone as info on how antivirus detection works and what can i do to prevent being seen as a malware. What has to be done to the BHO to pass avg detection ? Thank you.

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• How to figure out which record has been deleted in an effiecient way?

  - by janetsmith

  Hi, I am working on an in-house ETL solution, from db1 (Oracle) to db2 (Sybase). We needs to transfer data incrementally (Change Data Capture?) into db2. I have only read access to tables, so I can't create any table or trigger in Oracle db1. The challenge I am facing is, how to detect record deletion in Oracle? The solution which I can think of, is by using additional standalone/embedded db (e.g. derby, h2 etc). This db contains 2 tables, namely old_data, new_data. old_data contains primary key field from tahle of interest in Oracle. Every time ETL process runs, new_data table will be populated with primary key field from Oracle table. After that, I will run the following sql command to get the deleted rows: SELECT old_data.id FROM old_data WHERE old_data.id NOT IN (SELECT new_data.id FROM new_data) I think this will be a very expensive operation when the volume of data become very large. Do you have any better idea of doing this? Thanks.

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• Is WEP used in conjunction with a wireless access list adequate security?

  - by LeopardSkinPillBoxHat

  I use a Netgear wireless router, with various wireless devices connecting to it. One of my wireless devices doesn't support WPA2 security, so I had to downgrade the security on the router to WEP. We all know WEP is broken, so as an added measure I enabled a wireless access list on the router so that only devices with specified MAC addresses which are in my access list are permitted to connect to the router. I know it is possible to spoof a MAC address from a device for the purposes of accessing a secure network like this. But is it easy? Is using WEP and a wireless access list good enough to prevent most hacking attacks? Or should I do whatever I can to ensure all devices support WPA2 in the future?

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• How to reduce disk thrashing (paging)?

  - by skevar7

  I have 4 GB of RAM, but Windows still thrashes disk sometimes (especially often when an application is minimized for some time and then I activate it again). Completely stupid, because Task Manager shows 2 GB of RAM are free. Is there any way to prevent Windows swapping out program memory? I tried setting Superfetch to cache startup files only (it helped a bit) and turning off paging file (it helped much, and worked well for me in Windows XP; but Windows Vista/Windows 7 don't allow that - it shows "low on memory" message frequently, even when I have 1 GB of RAM free.) What can you advise me to do?

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• Why does OS X automatically logout my user?

  - by MBA_fv

  I have a new MacBook Air set up with filevault. In the Security preference pane I have "Require password 1 hour after sleep or screen saver begins" enabled, but the "Logout after 60 minutes of inactivity" is disabled. When I leave the computer on overnight I manually lock the screen (from the Keychain status menu bar, which I enabled via the Keychain Access preferences). Alas, in the morning I find that instead of a locked screen I see the login window, after my user was logged out with all applications terminated... (e.g. Firefox thinks it previously crashed when I launch it). This type of behavior only started after I enabled Filevault. Why is this happening? How do I prevent such auto-logout?

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• Can I run my MacBook in clamshell mode without being connected to power?

  - by kch

  Hi, At home, I run my MacBook in clamshell mode (closed lid, external display). This works fine when you're connected to the power adapter, but it doesn't work when running on battery. That's how it's supposed to be and Apple has some kb entry on the issue. But it's also lame. You can prevent the machine from sleeping when closed by running InsomniaX, but then it'll assume the builtin display is still active, so you end up with a two-display setup when you really only want the external. This is obviously less than ideal. So, is there any work around, hack, utility, black magic that I can use to make it run in clamshell mode while strictly on battery power? Also, bonus points for a solution that makes the AC status not affect the machine state at all. (Like, you know, it does normally, when not in clamshell.)

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• Is it Possible to Use Constraints on Hierarchical Data in a Self-Referential Table?

  - by pbarney

  Suppose you have the following table, intended to represent hierarchical data: +--------+-------------+ | Field | Type | +--------+-------------+ | id | int(10) | | parent | int(10) | | name | varchar(45) | +--------+-------------+ The table is self-referential in that the parent_id refers to id. So you might have the following data: +----+--------+---------------+ | id | parent | name | +----+--------+---------------+ | 1 | 0 | fruit | | 2 | 0 | vegetable | | 3 | 1 | apple | | 4 | 1 | orange | | 5 | 3 | red delicious | | 6 | 3 | granny smith | | 7 | 3 | gala | +----+--------+---------------+ Using MySQL, I am trying to impose a (self-referential) foreign key constraint upon the data to cascade on update and prevent deletion of a record if it has any "children." So I used the following: CREATE TABLE `test`.`fruit` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `parent` INT(10) UNSIGNED, `name` VARCHAR(45) NOT NULL, PRIMARY KEY (`id`), CONSTRAINT `fk_parent` FOREIGN KEY (`parent`) REFERENCES `fruit` (`id`) ON UPDATE CASCADE ON DELETE RESTRICT ) ENGINE = InnoDB; From what I understand, this should fit my requirements. (And parent must default to null to allow insertions, correct?) The problem is, if I change the id of a record, it will not cascade: Cannot delete or update a parent row: a foreign key constraint fails (`test`.`fruit`, CONSTRAINT `fk_parent` FOREIGN KEY (`parent`) REFERENCES `fruit` (`id`) ON UPDATE CASCADE) What am I missing? Feel free to correct me if my terminology is screwed up... I'm new to constraints.

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• Disable page cache on a specific page

  - by David Brunelle

  Hi, Not sure if I really am on the right forum, but if not, just tell me. I have a page that is coded in ASP (not .net) which is used to send email. We are currently having a problem in which the page seem to be sent twice sometime. Upon checking, we found out that those who have this problem are coming from big organisation, so it was suggested that their server might cache the file for some reason. I would like to know, is there a way in HTML (or ASP ) to prevent that from happening ? Or is it in IIS that we must set this up ? Thanks,

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• How do I disable automatic updates on OpenSUSE 12.2

  - by MathematicalOrchid

  For reasons unknown, OpenSUSE seems to have half a dozen different places that mention auto-update. Is there a way I can definitely, permanently, irreversibly disable auto-update so that new software will never, ever, under any circumstances, be installed? Ideally I want to prevent the OS from even connecting to the Internet to see if any updates are available. I've unchecked half a dozen things, but I'm still getting alerts telling me updates are available. I do now want updates! I can't believe this is so hard to turn off... In case it makes any difference, OpenSUSE 12.2 with a GNOME desktop.

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• Is it possible to detect that a database connection is to a copy rather than to the original database?

  - by user149238

  I have an application that needs to know if it is connected to the original database that it was installed with or if the connection is to a copy of that database. Is there any known method to know if the database has been cloned and the application is no longer connected to the original? I am specifically interested in MS SQL Server and Oracle. I was kicking ideas around for a stored procedure but that most likely doesn't have access to the hardware to confirm unique hardware information that would somewhat guarantee that the database is the one that it was originally connected to during installation. I'm trying to prevent/detect cloning of a database so that there is only 1 "true location of truth". Thanks!

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• What exactly is an invalid HTTP_HOST header

  - by rolling stone

  I've implemented Django's relatively new allowed hosts setting, which is meant to prevent attackers from submitting requests with a fake HTTP Host header. Since adding that setting, I now get anywhere from 20-100 emails a day notifying me of invalid HTTP_HOST headers. I've copied in an example of a typical error message below. I'm hosting my site on EC2, and am relatively new to setting up/maintaining a server, so my question is what exactly is happening here, and what is the best way to manage these invalid and I assume malicious requests? [Django] ERROR: Invalid HTTP_HOST header: 'www.launchastartup.com'.You may need to add u'www.launchastartup.com' to ALLOWED_HOSTS.

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• Game logic dynamically extendable architecture implementation patterns

  - by Vlad

  When coding games there are a lot of cases when you need to inject your logic into existing class dynamically and without making unnecessary dependencies. For an example I have a Rabbit which can be affected by freeze ability so it can't jump. It could be implemented like this: class Rabbit { public bool CanJump { get; set; } void Jump() { if (!CanJump) return; ... } } But If I have more than one ability that can prevent it from jumping? I can't just set one property because some circumstances can be activated simultanously. Another solution? class Rabbit { public bool Frozen { get; set; } public bool InWater { get; set; } bool CanJump { get { return !Frozen && !InWater; } } } Bad. The Rabbit class can't know all the circumstances it can run into. Who knows what else will game designer want to add: may be an ability that changes gravity on an area? May be make a stack of bool values for CanJump property? No, because abilities can be deactivated not in that order in which they were activated. I need a way to seperate ability logic that prevent the Rabbit from jumping from the Rabbit itself. One possible solution for this is making special checking event: class Rabbit { class CheckJumpEventArgs : EventArgs { public bool Veto { get; set; } } public event EventHandler<CheckJumpEvent> OnCheckJump; void Jump() { var args = new CheckJumpEventArgs(); if (OnCheckJump != null) OnCheckJump(this, args); if (!args.Veto) return; ... } } But it's a lot of code! A real Rabbit class would have a lot of properties like this (health and speed attributes, etc). I'm thinking of borrowing something from MVVM pattern where you have all the properties and methods of an object implemented in a way where they can be easily extended from outside. Then I want to use it like this: class FreezeAbility { void ActivateAbility() { _rabbit.CanJump.Push(ReturnFalse); } void DeactivateAbility() { _rabbit.CanJump.Remove(ReturnFalse); } // should be implemented as instance member // so it can be "unsubscribed" bool ReturnFalse(bool previousValue) { return false; } } Is this approach good? What also should I consider? What are other suitable options and patterns? Any ready to use solutions? UPDATE The question is not about how to add different behaviors to an object dynamically but how its (or its behavior) implementation can be extended with external logic. I don't need to add a different behavior but I need a way to modify an exitsing one and I also need a possibiliity to undo changes.

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• How Do I Make A Bash Script for Git Checkin/Checkout?

  - by ServerChecker

  I was thinking of bringing up a git service on an Ubuntu server. However, the way me and another programmer operate -- we really want to try and stick to one person working on a project at a time. How would I make a Bash script to create a check in and check out with git? We want to prevent anyone from checking in code that hasn't already been checked in, and it should error out with the name of the person who has the code checked out. EDIT: I'm not really interested in using Git with its fantastic diff features. I move 100mph and don't have time to play diff games with the other developers. That's why we're using Git. If the other developers want to play the diff game, they can still do so. But when I check something out, I want it locked to everyone until I check it back in again.

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• Automatically Log off Google when logging in using Google OpenID?

  - by Ross Charette

  I use Google as my OpenID provider. Once you log into a website with Google's OpenID I am then logged into Google as well. I do not desire this. Can I somehow automatically log off my Google account, or prevent Google from logging in every time I use my Google OpenID? I prefer not to have my personal google account always logged in. It's not a big deal going to gmail and clicking log off, but if there is a simpler way that would be good. Note to admins: this is not just for stack overflow, please don't close the question.

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• Ubuntu Volume overriding settings set in Alsamixer

  - by Hayek

  Problem: How do I "lock in" the volume I set through alsamixer? I'm running Ubuntu 9.10. I adjusted the bass/treble columns in alsamixer but changing the system volume resets them all back to 100% I did save the settings by running alsactl store but everything is reset once I touch Ubuntu's volume icon in the top menu bar. This is rather painful because the computer is hooked up to a 650watt system with a massive subwoofer. As much as I enjoy my music, there's no need to have the walls vibrate :) What can I do to prevent Ubuntu from overriding the settings?

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• nginx deny directory and files to be downloaded

  - by YeppThat'sMe

  gurus. I have a problem and i dont know how to solve it. I am working with Git and Compass/SASS on some projects. Now i want to protect those directories. When i go only to the folder its all fine – i get what i expected a 403 forbidden. location ~ /\.git { deny all; } But when i try use the full path to the config file from git the browser start to download it. Same scenario with compass. There is a config.rb file within the folder which also starts to download it. How can i prevent this behaviour? How can i deny downloading specific files?

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• SQL Server Reporting authentication not working

  - by Keith

  I'm not exactly sure what went wrong but our SQL Server Reporting Services authentication is no longer working correctly. When I try to load the site, it asks for a username and password, and mine doesn't work. I checked the service and it is using the NT AUTHORITY\NetworkService to logon. Since it is using NetworkService to logon, I read on Microsoft's site that I need to use these settings in the RSReportServer.config file: <AuthenticationTypes> <RSWindowsNegotiate /> </AuthenticationTypes> <EnableAuthPersistence>true</EnableAuthPersistence> Which is what I have set. It still asks for the password. When I set the Authentication to RSWindowsNTLM, it does login but everytime I click on a link, it asks for a password (the password doesn't seem to prevent anything from loading). Anyone know what is going on here? I'm not an expert to SQL Server so I may be missing something.

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• Adding a W2008 Authenticating Server to existing W2003 Domain?

  - by spelk

  I have an existing W2003 Domain, simple setup with one DC and a SQL Server (approx 100 users). There are issues with Windows 7 Clients and login scripts and we're now seeing much greater numbers of Windows 7 users turning up as they upgrade their PC/Laptops. What I want to do, is add another Server with W2008 on it, and authenticate the Windows 7 Clients - but leave the W2003 server running as is - to prevent disruption to the network and the existing WinXP users. Is it possible? Any advice as to how do this, without major disruption to the W2003 network?

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• Help w/ error "Account exceeded bandwidth limits" Thunderbird 3 + Gmail

  - by boo

  Over the past two days I have been receiving the following message on a new computer running Windows 7: Account exceeded bandwidth limits. (Failure) Whenever I try to access my emails through Thunderbird, this is followed by: Login to server imap.gmail.com failed. Credentials are correct as I have access via HTTP. And then it requests me to enter my password (I have also unlocked the captcha on this account, but this didn't stop any error messages) I'm looking for a details on why this is happening, to prevent it from reoccurring, such as whether this is specific to something in Thunderbird 3 or google?

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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• Database abstraction/adapters for ruby

  - by Stiivi

  What are the database abstractions/adapters you are using in Ruby? I am mainly interested in data oriented features, not in those with object mapping (like active record or data mapper). I am currently using Sequel. Are there any other options? I am mostly interested in: simple, clean and non-ambiguous API data selection (obviously), filtering and aggregation raw value selection without field mapping: SELECT col1, col2, col3 = [val1, val2, val3] not hash of { :col1 = val1 ...} API takes into account table schemas 'some_schema.some_table' in a consistent (and working) way; also reflection for this (get schema from table) database reflection: get list of table columns, their database storage types and perhaps adaptor's abstracted types table creation, deletion be able to work with other tables (insert, update) in a loop enumerating selection from another table without requiring to fetch all records from table being enumerated Purpose is to manipulate data with unknown structure at the time of writing code, which is the opposite to object mapping where structure or most of the structure is usually well known. I do not need the object mapping overhead. What are the options, including back-ends for object-mapping libraries?

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