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• How to handle input and parameter validation between layers?

  - by developr

  If I have a 3 layer web forms application that takes user input, I know I can validate that input using validation controls in the presentation layer. Should I also validate in the business and data layers as well to protect against SQL injection and also issues? What validations should go in each layer? Another example would be passing a ID to return a record. Should the data layer ensure that the id is valid or should that happen in BLL / UI?

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• Using excel as UI without VB

  - by 01

  I think every business person would like to have excel UI, however they are forced into using web applications that sometimes look like really bad excel. Are there any frameworks that help build excel ui without VB? I dont mean framework like POI or JExcel that allows you to generate excel reports.

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• Should I replace libapache2-mod-php5-filter with libapache2-mod-php5 on Debian 6 Apache 2.2.16?

  - by luison

  Upgrading various virtual machines we are having an issue with the Debian package upgrade to version 2.2.16 The upgrade (surprisingly) seems to remove libapache2-mod-php5 replacing it with libapache2-mod-php5-filter. This gave us some headache as the php.ini was pointing to the "old" one and some of the apache.conf conditional module rules stopped working. We can fix all those but we can't figure out if there would be any issues if we just "reversed" this and simply install libapache2-mod-php5 again and load that module instead of the "filter" one or in there is anyway to "alias" a module. I tend to think that the change "has a reason" but after reading apache2 and php5: module or filter I understand the module differences are to do with post delivery security issues.

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• Download file popup in IE not working it works well in Fire Fox

  - by Yogesh

  Hi window.location.href, using hidden Iframe and setting its source dynamically, setting return false; for onclick Nothing is working for IE. Basically, my dwr response generates a log file (foo.log) @business layer and it sends file name as response to dwr rpc request. Now I know the file name and its location I just want to download that file.(It works in FF not in IE).

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• SPAN/Port mirroring on Linksys switch

  - by Bastien974

  Hi all, I'm trying to deploy a Snort box in my LAN. I have a Linksys SRW248G4 and trying to configure Port mirroring so that Snort can listen everything on the network in promiscuous mode. So in ADMIN / Port Mirroring, I have 3 things: Source Port (e1,...e48, g1...g4) Type (Rx, Tx, Both) Target (e1...e48, g1...g4) Last time I played with it, I killed all traffic on the switch, I had to reboot it several times... so now I'm asking question before: Do I need to configure each Source Port (from 1 to 48) to forward to the single promiscuous port ? 48 rules !? Is that correct ? Thanks !

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• Why empty String is treated as null in oracle?

  - by GK

  We are using empty string in DB2 database for some business logic. but when the same record tried to insert into the Oracle it throws some not null property references to null value error. that is oracle treats empty string as null. So i am wondering why it is like that. and if there is a requirement of storing empty string how to do that on oracle?

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• Which dynamic language can easily use libraries from other languages?

  - by marienbad

  Tell why you think Python, Perl, Ruby, etc is easiest for plugging in modules from other languages with minimal thought. To clarify, an example: I want to write business logic in Python, but use functionality that conveniently exists as a Perl module. In other words, which language "just works" with the most modules?

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• What is model driven development good for?

  - by happyappa

  Microsoft, of Cairo fame, is working on Oslo, a new modeling platform. Bob Muglia, Senior Vice President of Microsoft Server & Tools Business, states that the benefits of modeling have always been clear. In simple, practical terms, what are the clear benefits that Oslo bestows upon its users?

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• JSF generic Exception Handling

  - by gaurav

  If I have an exception in my business layer (e.g. a SQL exception in my JDBC connection bean) how can I propagate it with a custom message to a global error.jsp page? Please help.

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• How to choose programming language for projects?

  - by bdhar

  This is a question I constantly encounter when I attend any technical forums / discussions / interviews. There is a similar article but it focuses on business merits as well. What I am looking for is a guide (not a checklist like this one which is abstract and not so accurate) which helps an architect to choose the programming language to implement a requirement. Is there a book or article available for the same purpose?

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• Syncronizing multiple exchange servers 2007

  - by Mustafa Ismail Mustafa

  We're introducing a new exchange server for several reasons. After the introduction of the new server, and synchronizing it with the old one (mailboxes, contacts, rules, the whole shebang) we're going to be formatting the old machine, install XenServer 5.5 on it, and create a slices, one of which will have Exchange server, which again will need to be synchronized. Then, we'll have 2 different routes to the mail servers (mx1, mx2) so that if there is an outage on one, the other should be available. So now, I'm wondering how to synch? I can move a mailbox from one server to the other, and I'm sure that can be done in bulk, but that's not what I'm looking for. I'm looking to make both Servers equal, the first time so I can make a backup of the original, and the second time so that they can be made into peers. This is with Exchange 2007 on Windows 2008 R2 (x64) Suggestions? TIA

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• Apache file negotiation failed

  - by lorenzo.marcon

  I'm having the following issue on a host using Apache 2.2.22 + PHP 5.4.0 I need to provide the file /home/server1/htdocs/admin/contents.php when a user makes the request: http://server1/admin/contents, but I obtain this message on the server error_log. Negotiation: discovered file(s) matching request: /home/server1/htdocs/admin/contents (None could be negotiated) Notice that I have mod_negotiation enabled and MultiViews among the options for the related virtualhost: <Directory "/home/server1/htdocs"> Options Indexes Includes FollowSymLinks MultiViews Order allow,deny Allow from all AllowOverride All </Directory> I also use mod_rewrite, with the following .htaccess rules: RewriteEngine On RewriteBase / RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^([^\./]*)$ index.php?t=$1 [L] </IfModule> It seems very strange, but on the same box with PHP 5.3.6 it used to work correctly. I'm just trying an upgrade to PHP 5.4.0, but I cannot solve this negotiation issue. Any idea on why Apache cannot match contents.php when asking for content (which should be what mod_negotiation is supposed to do)?

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• ESXi 5.1 on Poweredge 510 freezes after base-esx update

  - by goober

  Background / Problem Just experienced an issue where an ESXi host was upgraded from 5.0 -- 5.1 perfectly fine. Then, I did a scan and remediated a patch (ESXi510-201210401-BG) Looking into the host on via the kvm switch, this appears to complete successfully. However, on reboot, the server hangs at the "Initializing Power Management" phase. I've read from various spots around the internet that this usually clears itself up again upon a cold boot, but given that our servers are in a different building with different access rules, the less I have to physically go there, the better. :) Question Is there anything I can do to avoid an ESXi host hanging at the "initialize power management" phase of boot after remediating the host to apply patches?

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• Torrent, ISA Server 2006 and packet dropped due to TCP_NOT_SYNC

  - by Pascal

  Hi, I'm trying to get uTorrent 2.0.4 to work in a DMZ machine, protected by a ISA Server 2006. I've opened 1 inbound port (via publishing) and opened all the higher ports for that specific machine that runs uTorrent on my DMZ, and it's working almost fine. The problem is that I keep getting packets dropped with 0xc0040017 FWX_E_TCP_NOT_SYN_PACKET_DROPPED. Is there any way to disable this via registry? Is there any way around this? The download speed fluctuates a lot, and when I starts hitting the upper limit that I've defined in uTorrent, the errors start poping up a lot, and the download speed goes way down, and the process repeats on and on Tks Edit My outbound rules are: Port Range: TCP 10000-65535 Outbound Port Range: UDP 10000-65535 Send Edit It's probably a bug handling requests from Windows 7. When I installed the uTorrent on a XP machine, the problem went away

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• VirtuaWin shows Visual Studio 2010 in all Desktops

  - by w0lf

  I'm using VirtuaWin in Windows 7 to have virtual desktop functionality and I think this program is awesome. There's one small issue, though: on the computer at work, when moving to another desktop it hides all windows in the current desktop, except any windows of Visual Studio 2010. This means that VS 2010 shows up in all desktops, while for all other windows, VirtuaWin applies the correct behavior. The strange thing is that this issue happens on one computer only; on the others I have it works OK. I have checked the Window Rules section and nothing seems strange in there. Is anyone else experiencing this kind of problem? Any ideas on how to solve it?

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• Easy to use web-based reporting tool

  - by SuperFurryToad

  I'm looking for recommendations for an easy to use reporting/business intelligence tool that can interface with an sql server or access database. It can be web-based or a desktop tool. Ideally it would be freeware or low cost, and easy to use for users who are not that technically savvy (below the level of someone who can generate reports and complicated queries in Access). Any tools I've seen so far (such as Crystal Reports) are either too expensive or too complicated to use for non-power users.

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• Windows host MIA on network

  - by andrewbadera

  I've had a machine effectively disappear off my home office network. 192.168.1.100 - Windows 7 laptop (on domain) - problem machine 192.168.1.42 - Windows 2008 server (domain controller) 192.168.1.101 - Windows 7 laptop (guest; not on domain) For some reason I am unable to ping, tracert or remote desktop to 192.168.1.100 from .42 or .101. I can remote between .42 and .101 no problem however. .100 cannot ping nor remote desktop to .42 or .101. Remote Desktop access is enabled on .100. I've opened the firewall rules. I've disabled the firewall domain profile. I've turned the firewall service off entirely. No matter what I do, the .100 host is unreachable by any other host on the network. I'm at my wit's end. Thanks in advance for any debug advice!

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• Use Adblock to allow most ads on a site

  - by jrob

  I leave Adblock turned on for all sites by default. I allow ads on some sites. You can do this by adding an exception for a site that is allowed to show ads. This puts a site in the white list. However, I do not know how to allow most ads on a page, but block a specific ad. I am not even sure Adblock will do this. I believe it is all or none. If a site is in the white list, it appears that all other rules are ignored. Is there a way to allow most ads on a website, but still block specific ads?

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• Can I port forward to an established reverse ssh tunnel

  - by Ben Holness

  I have three computers, A, B and C A has initiated a reverse ssh tunnel to B: ssh -nTNx -p 443 -R 22222:localhost:22 [user]@[server] If I log in to B, I can use 'ssh -p 22222 localhost' and I get a login prompt for A. If I try 'ssh -p 22222 [public IP of B]', it doesn't work What I would like to be able to do is have C connect to A without needing to login to B. So from C I could 'ssh -p 22222 [public IP of B]' and I would get the login prompt for A. I am using debian and shorewall and I have a basic understanding of how things work. I have tried various combinations of REDIRECT and DNAT rules, but haven't had any luck. I have tried using the same port (22222) and a different port (forwarding 22223 from C to 22222 on localhost). Any ideas? Cheers, Ben

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• N-Tiered application design tool

  - by Ben V

  I'm beginning the design of a medium-sized web application. I usually like to design from the top down, i.e., start at the highest level and design my way down. I am planning to have the following layers: Presentation (PHP/Ajax) Business Logic Data Access Database Now I'd like to start sketching out the major objects in each layer and the interaction between layers. Is there a tool more specific to this purpose than just using a graphics/diagramming tool like Visio?

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• Specification Pattern vs Spec in BDD

  - by cadmium

  I'm trying to explore Behavior Driven Design and Domain Driven Design. I'm getting that written specifications drive the tests in BDD, but also that business logic can be encapsulated using the specification pattern for re-use in domain objects and repositories, etc. Are these basically the same concept just used in different ways, used in conjunction together, or am I completely confusing the concepts? Please shed some light, if possible.

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• Why Hire Programmers?

  - by editorial photography

  You might keep pondering over this question a million times in your head. When there are so many softwares available that can make the work easy, why to hire web programmer. There is a difference. Building a website on your own and seeking the help of professionals can create a major impact on your business.

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• Excel VBA Application.OnTime. I think its a bad idea to use this... thoughts either way?

  - by FinancialRadDeveloper

  I have a number of users I support that are asking for things to happen automatically ( well more automagically but that's another point!). One want events to happen every 120 secs ( see my other question ) and also another wants 1 thing to happen say at 5pm each business day. This has to be on the Excel sheet so therefore VBA as addins etc will be a no no, as it needs to be self contained. I have a big dislike of using Application.OnTime I think its dangerous and unreliable, what does everyone else think?

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• OpenVPN Bridge on pfsense: once LAN pings clients, connectivity breaks

  - by Lucas Kauffman

  So I'm using a pfsense openvpn to bridge my LAN segment so VPN users can access the servers. The problem I'm having now is that I can establish a connection, I can ping the LAN server from the VPN, but as soon as I ping the client from the LAN server, there is no connectivity anymore between both parties. So: connect from the VPN client to the LAN = works ping the LAN from the VPN client = works access server from the VPN (ssh, ftp,...) = works ping client from server = doesn't work ping LAN from the VPN client = doesn't work anymore My bridge has em1 and ovpns1 bridged. I noted with tcpdump that ICMP is reaching the bridge between LAN and the VPN segment. But it's not put onto the em1 interface for some reason. My pfsense is running on an ESXi host with th vSwitch port enabled in promiscious mode. Firewall rules allow in and outbound traffic regardless origin or destination.

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• SQL Server 2008 lincensing question relating to web servers

  - by Matty Brown

  We purchased SQL Server 2008 Standard licences last year under the server + device CAL licencing model. Since our server has 2 physical CPUs and only 46 clients, this option was by far the cheapest. Now we'd like to be able to query a small number of stored procedures from our Windows Server 2003 Web Edition server, which is in a seperate zone on our firewall. I think SQL Server 2008 Web Edition could be an option to us, but is it possible to replicate/mirror stored procedures and tables to such a server and would we be breaking any rules by doing so? Is this a form of multiplexing? Also, would replication/mirroring work both ways, if we were to want to write back data from the web server?

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