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• What is the maximum number of TCP connections I can have in Windows Server 2008?

  - by evilfred

  I would like to have as many connections (single connections from many different clients) as humanly possible in a server running on Windows Server 2008, in order to support a Comet-style application. The application is written in C#. The connections will not be chatty, they just need to be open (and stay open). Buying boatloads of memory and fast CPUs are not a problem. As far as I can tell, I will be limited to 65k simultaneous open connections per NIC - the maximum number of ports. Is this accurate? Or can I go beyond 65k connections / NIC somehow? It seems like there are server products for Linux at least that support hundreds of thousands of connections. How do they do this?

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• Can a client determine whether the server has accept()'d a unix socket?

  - by Havoc P

  I'm dealing with a buggy server that will sometimes fail to accept() connections (but leaves its listening socket open). This is on Linux with unix domain sockets. Currently the only way to detect this is that after sending a bunch of data, the buffer fills up and blocks, and the server isn't sending any replies. This long-after-the-fact failure mode is hard to distinguish from other bugs - the server could be unresponsive for other reasons. Especially for unix domain sockets it seems the kernel should know whether accept() has occurred; is there any way to find this out? Can the client block until accept() happens somehow, or at least check whether it has? This is just for debugging purposes so it can be a little ugly.

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• Eclipse hangs when rebuilding after the addition of an external JAR file.

  - by celestialorb

  I'm fairly new to Eclipse so if this is something simple I apologize, however when I attempt to add an external JAR file to my build path (specifically the "rt.jar" file which contains certain tools that I require) and then rebuild my project, Eclipse will hang at the end of the Build process. It'll get to 100% then just hang there using 100% of one of my CPU cores. At first I thought it may have been due to the relatively large size of the rt.jar file, but I tried using smaller JAR files and it still hung at 100%. Any help would be greatly appreciated! If there is something wrong with using the rt.jar file does anyone know of another JAR file that contains both tools for dealing with SOAP requests as well as XML/DOM manipulation? Thanks again!

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• How to Generate Edifact message from a xml ?

  - by Clem

  Hello, I'm currently dealing with customs messages Beans in Java. After filling in the Beans with different values, I want to produce an EDIFACT CUSDEC message corresponding to each message. For each attribute of a message Bean, I have the information to put the attribute in the right place in EDIFACT CUSEDC format. Thus, I am looking for a free tool (a Java API) which could ideally convert my full-filled Bean into an EDIFACT CUSDEC message. I found a commercial solution (not free) there : http://www.datadirect.com/products/edifact-grid/index.ssp And a quick tutorial here : http://biemond.blogspot.com/2008/09/generate-edifact-message-from-xml.html But ... unfortunately it is not free.. Thanks in advance for your help!

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• TightVNC (or any VNC) client windows scaling

  - by mr.b

  Hi, I am currently using TightVNC to connect to multiple remote hosts in LAN. I start 16 VNC instances, set Scaling by: Auto (in connection options display), set Hextile encoding, and then select all windows and use Tile Horizontally, which covers my entire screen with VNC screens. It all works sort of nice, except that desktop interaction is really slow when there are more then 4 VNC clients. My question is, does VNC client (not just TightVNC, but any compatible client) support some kind of smart scaling option, so that client tells server something along the lines of: "Okay, I'm displaying your entire screen in a window size 300x225 px, so can you please start sending encoded images on that resolution?", at which point interactiveness of open connections dramatically increase, and when I decide to go full screen on some connection, client and server re-negotiate and server starts sending full resolution images again? Thanks!!

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• How to store private pictures and videos in Ruby on Rails

  - by TK

  Here's a story: User A should be able to upload an image. User A should be able to set a privacy. ("Public" or "Private"). User B should not be able to access "Private" images of User A. I'm planning to user Paperclip for dealing with uploads. If I store the images under "RAILS_ROOT/public/images", anyone who could guess the name of the files might access the files. (e.g., accessing http://example.com/public/images/uploads/john/family.png ) I need to show the images using img tags, so I cannot place a file except public. How can I ensure that images of a user or group is not accessible by others?

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• EJB3.1 Remote invocation - is it distributed automatically? is it expensive?

  - by Hank

  I'm building a JEE6 application with performance and scalability in the forefront of my mind. Business logic and JPA2-facade is held in stateless session beans (EJB3.1). As of right now, the SLSBs implement only @Remote-interfaces. When a bean needs to access another bean, it does so via RMI. My reasoning behind this is the assumption that, once the application runs on a bunch of clustered application servers, the RMI-part allows the execution to be distributed across the whole cluster automagically. Is that a correct assumption? I'm fine with dealing with the downsides of that (objects lose entityManager session, pass-by-value), at least I think so. But I am wondering if constant remote invocation isn't adding more load then necessary.

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• SSL certificates with password encrypted key at hosting provider

  - by Jurian Sluiman

  We are a software company and offer hosting to our clients. We have a VPS at a large Dutch datacenter. For some of the applications, we need an SSL certificate which we'd like to encrypt with a password protected keyfile. Our VPS reboots now and then because of updates whatsoever, but that means our apache doesn't start right away because the passwords are needed. This results in downtime and is of course a real big problem. We can give the passwords to our VPS datacenter, or create certificates based on keyfiles without passwords. Both solutions seem not the best one, because they compromise the security of our certificates. What's the best solution for this issue?

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• BITS http download job fails to connect for owner Local SYSTEM account

  - by MikeT

  A service I have written that uses BITS (Background Intelligent Transfer Service) to auto update itself is having a problem on some machines (Windows 7 so far). I have been investigating and have discovered that some of the jobs that my service adds to the bits queue are failing immediately with the error code 0x80072efd (a connection with this server could not be established). The is not problem with connecting to the server for the download as it works fine on the same machine using IE (or any other web browser) and other clients can connect and update from the same server. I tried using the BITSADMIN.exe tool to add the jobs manually and they worked ok. I then changed the account my service was running under to the network service account so the bits jobs would be created with a different owner and the jobs completed successfully. My question is I don't want to run my service as this account as it wont have the required local permissions, so how to I change the permissions of the local system user to allow it to download from the HTTP source, I'm not aware of any way of this being restricted for this account but it obviously is.

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• Software to cache a web application for use offline

  - by littlecharva

  My boss quite regularly has to demo our web application to clients in a situation with no wifi available and sketchy 3G access, quite often the 3G lets him down. I have considered setting a copy of our server up in a virtual machine on his laptop so he could demo it offline, but I fear this will just introduce more headaches when he forgets how to boot the VM up. What I'd ideally like is an app that records you logging into a web app, saves copies of all the pages and ties the links and buttons you click up to offline copies of the pages it saves. So you could run through the demonstration you're going to give and have it cache the pages. When you then click the same buttons and links in offline mode it will present the relevant offline pages. Does such a thing exist? Can anyone recommend any alternative solutions to this problem? Thanks, Anthony

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• How can I get pidgin to replace animations/graphics with their alt text?

  - by Flimzy

  I have a few contacts who use annoying text-to-animation plugins in their clients, that do things like turn the word "hi" into an animation of Kermit the Frog waving at me, or other equally annoying non-sense. This is even more annoying when it does the conversion mid-word, like turning "This" into "T<Kermit waving>s". To get around this annoying behavior, I often find myself copying their text from pidgin, and pasting into a text editor, which always replaces the animations with their original text (presumably by way of some html ALT tag, or the moral equivalent). Obviously pidgin knows what the original text was, because it was able to provide that text to the copy buffer. So how can I get Pidgin to just show me the original text, as if there were no annoying animations in the first place?

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• Firewall GPO not applying despite being enumerated by gpresult

  - by jshin47

  I have a need to open up the admin$ share on all of my domain's client PC's and I am trying to do so using group policy. I defined computer policy for Windows Firewall with Advanced Security in a policy object linked to the appropriate container and added the appropriate rules. However, they are not being applied! I feel like I have tried all of the obvious steps: I've checked gpresult and the resulting set of policy is the way that I would expect it to look. I've gpupdate /force and gpupdate /sync on a few client computers, but no matter what I do they don't seem to respond to my changes. I know that other computer policies in the GPO are being applied so it is strange that these are not. I have also disabled exceptions on clients in the firewall GPO, but that doesn't seem to be applying either. Here is a screenshot of the firewall.cpl from a client: Basically, although other options in the same GPO ARE applied for computer policy, the firewall settings seem to be ignored.

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• Sending large files - do any vendors sell their solution?

  - by Rob Nicholson

  We currently have an account with www.mailbigfile.com to allow us to send & receive files which exceed our client's email limits. In our industry, a 10MB limit is not unknown. Mailbigfile works fine for what it is but increasingly, our clients are starting to block it as a security risk. A solution would be for us to license the software and run it from our own web server which is far less likely to be blocked. Does anyone know of vendors in this market? We are looking at web collaboration systems but that's a much bigger project. The technology behind www.mailbigfile.com isn't that complex (http upload, email notification and then http download) so I'm hoping it won't be very expensive. Cheers, Rob.

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• Conceptual question about NSAutoreleasePools

  - by ryyst

  In my Cocoa program, wouldn't a really simple way of dealing with autoreleased objects be to just create a timer object inside the app delegate that calls the following method e.g. every 10 seconds: if (pool) { // Release & drain the current pool to free the memory. [pool release]; } // Create a new pool. pool = [[NSAutoreleasePool alloc] init]; The only problems I can imagine are: 1) If the above code runs in a separate thread, an object might get autoreleased between the release call to the old pool and the creation of the new pool - that seems highly unlikely though. 2) It's obviously not that efficient, because the pool might get released if there's nothing in it. Likewise, in the 10 second gap, many many objects might be autoreleased, causing the pool to grow a lot. Still, the above solution seems pretty suitable to small and simple projects. Why doesn't anybody use it? What's the best practice of using NSAutoreleasePools?

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• What Windows licenses are required to run additional terminal service sessions

  - by John P

  We need to build out a server running Windows 2008 R2 Standard that can allow up to 10 simultaneous RDP/Terminal Services connections and I'm a little confused about how the CAL licenses work. From one source I was told I needed 10 "server CALs" and an additional 10 "RDP CALs" (total of 20 CALs). From another, I was told I just needed the 10 "RDP CALs", which implicitly came with the server CAL. The Microsoft licensing website (http://www.microsoft.com/windowsserver2008/en/us/licensing-rds.aspx) seems to support scenario #1, but it is still not real clear what those server CALs are needed for. Also, can we use the 2 "built-in" RDP clients, meaning we only need to purchase 8 CALs to reach a total of 10?

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• Properly removing an Integer from a List<Integer>

  - by Yuval A

  Here's a nice pitfall I just encountered. Consider a list of integers: List<Integer> list = new ArrayList<Integer>(); list.add(5); list.add(6); list.add(7); list.add(1); Any educated guess on what happens when you execute list.remove(1)? What about list.remove(new Integer(1))? This can cause some nasty bugs. What is the proper way to differentiate between remove(int index), which removes an element from given index and remove(Object o), which removes an element by reference, when dealing with lists of integers? The main point to consider here is the one @Nikita mentioned - exact parameter matching takes precedence over auto-boxing.

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• Replacing sick NTP server source and re-synching (with internal time currently 2 minutes late)

  - by l0c0b0x

  One of the external NTP servers (the primary one--currently) we're using as source seems to not be responding to NTP calls. Unfortunately, on our core router (Cisco 6509), the NTP functionality hasn't switched to the secondary NTP external server as it was expected. As a result, our core router which is pretty much our main internal NTP source is 2 minutes late. I'm planning to fix the external router issue by making the external NTP source be the one currently working. I'm wondering, how much will a 2 minute change affect my users and services? Specially since these days, we're heavily relying on certificate-based authentication. We're a Windows/Cisco shop. Internal NTP setup: [Core Router 1 / Cisco 6509]: looking out to two external NTP servers (in which the primary one is not responding to NTP calls) [Core Router 2]: Synching with Core router 1 (primary), working external router (secondary) [Other Cisco network devices]: Synching with Core router 1 (primary), core router 2 (secondary) [Domain controller(s)]: Synching with Core router 1 [All windows clients/servers]: Synching with domain controllers

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• UDP Reverse Proxy

  - by user180195

  I have found a way to make reverse-proxy to an external IP. Here is how someone making a request will see it's request being passed: Clients sends request Request reaches the Datacenter one in some place That datacenter, acting as a reverse proxy will redirect the same exact request to another datacenter. The datacenter will then process the request Although, this only works with TCP/HTTP (Looking currently at HaProxy). I am hosting game servers at the other datacenter (where the proxy is not) that are using UDP protocol. Do you know how can I setup a reverse proxy using the UDP protocol.

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• Recovering mail from hardrive (broken os).

  - by Maciek Sawicki

  Hi, Friend of mine broke his Windows (doesn't boot). I will probably have to reinstall OS. I want to mount his hard drive in my OS to beck up some important files. He sad he uses Outlook express, but he Use Vista so I'm not sure it's Vistas Mail Client or Outlook. What files I have to copy to backup mail and adders book from Outlook, Outlook Express and Windows Mail? Is it any good program for doing it automatically (for Linux or Windows)? If there are tools or special procedures for other mail clients (for example Thunderbird) you can also name them to make this question more generic.

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• GCC/XCode equivalent of _CrtCheckMemory?

  - by Chris Becke

  When dealing with random memory overwrites, in MSVC it is possible to validate the state of the heap at various points with a call to _CrtCheckMemory, and know with at least a small level of confidence that the code up until the check was not responsible for any errors that might cause new or malloc to fail later. In XCode, whats the equivalent way to try and box in a memory overwrite? All I have at the moment is a random failure of a call to new, somewhere deep in the bowels of some code with no real idea of how long the code has been running with a corrupt heap up until that point.

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• Parsing Complex Text File with C#

  - by David

  Hello, I need to parse a text file that has a lot of levels and characters. I've been trying different ways to parse it but I haven't been able to get anything to work. I've included a sample of the text file I'm dealing with. Any suggestions on how I can parse this file? I have denoted the parts of the file I need with TEXTINEED. (bean name: 'TEXTINEED context: (list '/text '/content/home/left-nav/text '/content/home/landing-page) type: '/text/types/text module: '/modules/TEXTINEED source: '|moretext| ((contents (list (list (bean type: '/directory/TEXTINEED ((directives (bean ((chartSize (list 600 400)) (showCorners (list #f)) (showColHeader (list #f)) (showRowHeader (list #f))))))) (bean type: '/directory/TEXTINEED ((directives (bean ((displayName (list "MTD")) (showCorners (list #f)) (showColHeader (list #f)) (showRowLabels (list #f)) (hideDetailedLink (list #t)) (showRowHeader (list #f)) (chartSize (list 600 400))))))) (bean type: '/directory/TEXTINEED ((directives (bean ((displayName (list "QTD")) (showCorners (list #f)) (showColHeader (list #f)) (showRowLabels (list #f)) (hideDetailedLink (list #t)) (showRowHeader (list #f)) (chartSize (list 600 400)))))))) Thanks!

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• Is it still "wrong" to require TLS on incoming SMTP messages

  - by jackweirdy

  According to the STARTTLS Spec Section 5: A publicly-referenced SMTP server MUST NOT require use of the STARTTLS extension in order to deliver mail locally. This rule prevents the STARTTLS extension from damaging the interoperability of the Internet's SMTP infrastructure. A publicly-referenced SMTP server is an SMTP server which runs on port 25 of an Internet host listed in the MX record (or A record if an MX record is not present) for the domain name on the right hand side of an Internet mail address. However, this spec was written in 1999, and considering it's 2014, I'd expect most SMTP clients, servers, and relays to have some kind of implementation of STARTTLS. How much email can I expect to lose if I require TLS for incoming messages?

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• How can i set new domains to respond to my server

  - by André

  I would like to create a page for new clients in my hosting. When someone register a domain, sometimes that person don't have a dns, or the hosting didn't created the account. So the page will not respond. Is there any way to set in my primary domain DNS to respond to all domains pointing to me, to a specific new page like home/resseler/public_html/soon.html ? Like a CNAME myserver.com/soon.html CNAME ~~all domains pointing to my ns1 and ns2. A normal default page for news domains pointed to my server without account creation.

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• Looking for something like Google's Picasa [closed]

  - by Skizz

  I almost like Picasa, but there are two issues that irk me and I wondered if anyone knew of an application that does what Picasa does but without the following problems: Network drives. Picasa is hopeless with network drives. Ideally, I'd like photos to be stored remotely and thumbnail databases to be stored locally with a client-server set-up to update client databases. The main aim is to get updates propagated to clients efficently, reduce network bandwidth and have quick browsing on the client. It needs to be snappy when used over a wireless network. This is just a minor point but the folder view looks awful, especially when it uses those tiny thumbnails. (Also, what is it with folders being drawn vertically. Having spent years looking at folders orientated horizontally, turning them on their side looks so wrong.)

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• Solaris TCP/IP performance tuning

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck? PS I posted this on StackOverflow originally. One person suggested snoop and dtrace. dtrace seems pretty general - are there any additional pointers on how to use it to diagnose TCP issues?

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