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• Java dropping half of UDP packets

  - by Andrew Klofas

  Greetings, I have a simple client/server setup. The server is in C and the client that is querying the server is Java. My problem is that, when I send bandwidth-intensive data over the connection, such as Video frames, it drops up to half the packets. I make sure that I properly fragment the udp packets on the server side (udp has a max payload length of 2^16). I verified that the server is sending the packets (printf the result of sendto()). But java doesn't seem to be getting half the data. Furthermore, when I switch to TCP, all the video frames get through but the latency starts to build up, adding several seconds delay after a few seconds of runtime. Is there anything obvious that I'm missing? I just can't seem to figure this out. Thanks, Andrew

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• NHibernate's automatic (dirty checking) update behaviour - turning it off

  - by Andrew Bullock

  I've just discovered that if I get an object from an NHibernate session and change a property on object, NHibernate will automatically update the object on commit without me calling Session.Update(myObj)! I can see how this could be helpful, but as default behaviour it seems crazy! How can I stop this happening? Is this default NHib behaviour or something coming from Fluent NHibs AutoPersistenceModel? If there's no way to stop this, what do I do? Unless I'm missing the point this behaviour seems to create a right mess, violating my UoW. Im using NHibernate 2.0.1.4 and a Fluent NHib build from 18/3/2009 Edit, is this guy right with his answer? Edit: I've also read that overriding an Event Listener could be a solution to this. However, IDirtyCheckEventListener.OnDirtyCheck isn't called in this situation. Does anyone know which listener I need to override? Thanks Andrew

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• wheel of fortune collision detection

  - by Andrew

  Hey, I have a wheel segmented into 8 pie pieces, and a picker that is pointing at the currently selected segment (think wheel of fortune). I want to highlight the currently selected segment, and so have started to use Chipmunk to construct the 8 segments, attached to a rotating body, and then the picker that is put in a position to collide with each of the segments. The trick is, how do you allow the picker to pass over top of the segments, while still getting the collision, but not actually colliding and slowing down the wheel? I haven't started down this path yet, but thought this may solve the problem: removing the colliding segment and then putting it back after the picker has started colliding with another segment a bit away (like two segments away). There may be a much simpler solution not even involving Chipmunk that I haven't thought of. Thanks, Andrew

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• Tips on debugging copy and paste into powerpoint 2010

  - by Andrew S.

  I have a custom application in C++ that has been used to successfully copy-and-paste an object from the application into MS Office 2003 and 2007 (Word, Excel and PowerPoint). The object opens in our own custom activeX control. Now with windows XP and PowerPoint 2010, nothing happens on the cut-and-paste. I have tried turning off the smart copy/paste to no avail. Copy/paste works with Word and Excel 2010. Do you have tips on how to debug this? Thanks Andrew

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• filtering for multiple values on one column. All values must exist, else - return zero

  - by Andrew

  Hello All, I would like to filter one column in a table for couple values and show results only if all those values are there. If one or more is missing, then return zero results. example table +----+--------+----------+ | id | Fruit | Color | +----+--------+----------+ | 1 | apple | red | | 2 | mango | yellow | | 3 | banana | yellow | +----+--------+----------+ example "wrong" code: (this must return 3 rows) select Fruit FROM table WHERE Color = red AND Color = yellow but select Fruit FROM table WHERE Color = red AND Color = green must return 0 rows. (If i use select Fruit FROM table WHERE Color = red OR Color = green i get 1 row which is not what i need) I am using PHP with form where user checks different checkboxes that represent different values of the same column. So when he selects multiple checkboxes, all those values should be in the result set, otherwise no result should be given. Thank you, Andrew

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• NHibernate Linq queries not returning data saved in the same transaction

  - by Andrew

  Hi, I have a situation where I am using NHibernate in a WCF service and using a TransactionScope for the transaction management. NHibernate enlists in the ambient transaction fine, but, any changes I make and save inside the transaction, are not visible to any queries I make while still in that transaction. So if I add an entity and session.save() it, then further on in the code, there is a linq query against that entities table, the entity I just added is not returned. Strangely this seems to work fine if I use explicit NHibernate transactions in my tests. Anyone have any ideas as to why and what I can do about it? Many thanks Andrew

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• Windows Installer using usb drive for temp purposes

  - by Douglas Anderson

  When installing apps that are built around Windows Installer, it would appear that it often uses my external usb hard disk (when it's connected) as the temp location while it expands and installs the application (creates a folder off the root with a guid name). Is there anyway to change this so it always defaults to a specific drive? This appears to be the case on Windows Vista and 7, not sure about previous releases. EDIT: Current environment variables look like this: TEMP=C:\Users\<me>\AppData\Local\Temp TMP=C:\Users\<me>\AppData\Local\Temp EDIT: I have a funny suspicion that it's using the drive with the largest available free space.

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• Exim - send certain "local" user mail to smtp

  - by Ryan Anderson

  I'm using Exim 3 and would like to know how to send some local addresses to the smtp server instead of Exim handling them as a localuser. They are local addresses in the sense that they have the same domain as listed in 'local_domains' in exim.conf. I tried using the "require_files" option on the localuser director in exim.conf, but with no luck. Any help appreciated. Thanks, Ryan

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• Automatically Applying Security Updates for AWS Elastic Beanstalk

  - by Eric Anderson

  I've been a fan of Heroku since it's earliest days. But I like the fact that AWS Elastic Beanstalk gives you more control over the characteristics of the instances. One thing I love about Heroku is the fact that I can deploy an app and not worry about managing it. I am assuming Heroku is ensuring all OS security updates are timely applied. I just need to make sure my app is secure. My initial research on Beanstalk shows that although it builds and configures the instances for you, after that it moves to a more manual management process. Security updates won't automatically be applied to the instances. It seems there are two areas of concerns: New AMI releases - As new AMI releases hit it seems we would want to run the latest (presumably most secure). But my research seems to indicate you need to manually launch a new setup to see the latest AMI version and then create a new environment to use that new version. Is there a better automated way of rotating your instances into new AMI releases? In between releases there will be security updates released for packages. Seems we want to upgrade those as well. My research seems to indicate people install commands to occasionally run a yum update. But since new instances are created/destroyed based on usage it seems that the new instances would not always have the updates (i.e. the time between the instance creation and the first yum update). So occasionally you will have instances that aren't patched. And you are also going to have instances constantly patching themselves until the new AMI release is applied. My other concern is that perhaps these security updates haven't gone through Amazon's own review (like the AMI releases do) and it might break my app to automatically update them. I know Dreamhost once had a 12 hour outage because they were applying debian updates completely automatically without any review. I want to make sure the same thing doesn't happen to me. So my question is does Amazon provide a way to offer fully managed PaaS like Heroku? Or is AWS Elastic Beanstalk really more of just a install script and after that you are on your own (other than the monitoring and deployment tools they provide)?

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• How do I fix "getaddrinfo: localhost Name or service not found" for telnet server?

  - by Nick Anderson

  I need to enable telnet (no i can't use ssh, and I don't want to discuss why I have to use telnet either), I have 127.0.0.1 localhost.localdomain localhost in /etc/hosts. I have installed telnet-server, chkconfigd it on, and enabled xinetd. SElinux is disabled. But every time I try and telnet to the host I get "getaddrinfo: localhost Name or service not known". Any ideas?

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• Running Safari from the command line adds current directory to the URL

  - by Charles Anderson

  I am trying to run the Safari browser (on Mac OS 10.4) from the command line, as follows: /Applications/Safari.app/Contents/MacOS/Safari http://localhost/dev/myfile.html However, Safari starts up and tries to access file:///Users/charlesanderson/scripts/http://localhost/dev/myfile.html /Users/charlesanderson/scripts happens to be my current directory. Can someone explain why Safari does this? Firefox is much better behaved?

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• What configuration changes can I make to speed up extremely slow Windows VM's in ESXi 4.0.

  - by Shawn Anderson

  I've recently moved from VMWare Server to ESXi 4.0. Running on Dell T310. My VM's have been restored but they are running dog slow compared to VMWare Server. I loaded ESXi 4.0 using only default values. Where are some areas where I can tweak the performance? Even logging onto the VM's can be extremely sluggish. Trying to install software on any of them is a new experience in pain. Dell PowerEdge T310 Xeon X3460 2.80 GHz 32 GB RAM 1 HD (2 TB) I have 16 VM's on this server, but only six or so will be running during my testing. I keep an eye on the Resource Allocation and Performance tabs for the host and I never see CPU or RAM getting anywhere close to pegged. Events tab does show some notices for video RAM issues and some hints on Windows activation issues, but nothing that would point to the sort of sluggishness that I'm experiencing. 1 Windows Server 2008 R2 (64-bit) - 4 GB RAM 1 Windows 7 (32-bit) - 2 GB RAM 1 Vista (32-bit) - 1 GB RAM 3 XP (32-bit) - 1 GB RAM Over to you! Thanks - Shawn

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• How well will ntpd work when the latency is highly variable?

  - by JP Anderson

  I have an application where we are using some non-standard networking equipment (cannot be changed) that goes into a dormant state between traffic bursts. The network latency is very high for the first packet since it's essentially waking the system, waiting for it to reconnect, and then making the first round-trip. Subsequent messages (provided they are within the next minute or so) are much faster, but still highly-latent. A typical set of pings will look like 2500ms, 900ms, 880ms, 885ms, 900ms, 890ms, etc. Given that NTP uses several round trips before computing the offset, how well can I expect ntpd to work over this kind of link? Will the initially slow first round trip be ignored based on the much different (and faster) following messages to/from the ntp server? Thanks and Regards.

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• nginx - Redirect specific page paths to https while keeping everything else on http (in a single server call)?

  - by Kris Anderson

  From what I've gathered so far it's clear that running if statements in nginx should be avoided at all costs. Most of the examples I've found so far regarding specific page redirects involve multiple servers being used. But, isn't that a bit wasteful? I'm not sure, but I would think multiple servers to accomplish this would be somewhat slower then a single server when under heavy load. My current server call is this: server { listen 10.0.0.60:80; listen 10.0.0.60:443 default ssl; #other code } What I want to do is redirect certain http requests to https requests. For example, I want /login/ and /my-account/ to always be forced to use SSL. If you're on /help/ though, I want that served over the default http. Is there a way to accomplish this within a single server call? Or is there no downside to using 2 server calls to get this working? nginx seems to be under pretty active development and a lot of the older guides I've followed were from times when you couldn't listen to requests for port 80 and 443 within the same server call. But now that nginx has been updated to support that (I'm running 1.2.4), I'm wondering if there's a "best practice" way of handling this today. Any help would be greatly appreciated. EDIT: I did find this guide: http://redant.com.au/blog/manage-ssl-redirection-in-nginx-using-maps-and-save-the-universe/ and I updated my code as follows: map $uri $my_preferred_proto { default "http"; ~^/#/user/login "https"; } server { listen 10.0.0.60:80; ## listen for ipv4; this line is default and implied listen 10.0.0.60:443 default ssl; if ($my_preferred_proto = "none") { set $my_preferred_proto $scheme; } if ($my_preferred_proto != $scheme) { return 301 $my_preferred_proto://mysite.com$request_uri; } It's not working though. When I change the default to https everything is redirected to SSL so it does somewhat work. But the redirect of /#/user/login is not redirecting to HTTPS. Any ideas? Also, is this a good way to go about this?

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• How to create a readonly root linux: Can be mounted as writeable for persistent changes?

  - by Mr Anderson

  I'd like a read only file system that runs almost entirely in RAM but the compact flash or hardrive can be mounted and made writeable to make persistent changes. How do I do this on Linux? I've looked at several tutorials but none really explain how to create such a system with the option of being able to mount the storage device and make persistent changes. I looked at this so far: http://chschneider.eu/linux/thin_client/ I also looked on the old gentoo wiki but the article was very specific to Gentoo. I'll be using a debian based Linux but it would be nice I've someone could explain to me how to do this in pretty generic instructions ,that would work on any Linux distro. Thanks.

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• Green System Administrator looking for helpful tips

  - by Joshua Anderson

  I have just been promoted to Systems Administrator for our product. We are designing a application that communicates with the cloud(Amazon EC2). I will be in charge of maintaining all Instances and their underlying components. So far this involves a set of load balanced services instances that connect to a central DB in a multi-tennant DB design. Im interested in what other Sys. Admins have discovered as invaluable tools or practices. Any resources provided will be greatly appreciated.

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• Can I cancel a resize operation in GParted without causing data loss?

  - by Anderson Green

  I'm currently waiting for GParted to finish resizing a partition, but the progress bar is currently at 0, and it's been taking much longer than usual (perhaps an hour). Is it safe to cancel the resize operation? I don't want to wait days for the resize operation to complete, but I don't want to lose all of my files either. (Is there any way that I can simply pause the resize operation, attempt to recover files, and then resume the resize operation?) (An update: the operation has finally completed, and my files are still intact!)

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• How to troubleshoot Hyper-V VSS writer causing backup failure on Server 2008 R2

  - by Tim Anderson

  I have a Windows Server 2008 R2 machine running Hyper-V. Backups using Windows Server Backup fail with the error: The backup operation that started at '?2011?-?01?-?02T10:37:01.230000000Z' has failed because the Volume Shadow Copy Service operation to create a shadow copy of the volumes being backed up failed with following error code '2155348129'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved. I have traced this to a problem with the Hyper-V VSS writer. vssadmin list writers reports: Writer name: 'Microsoft Hyper-V VSS Writer' Writer Id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de} Writer Instance Id: {fcf0dd79-d282-4465-88ae-7b6857e055c2} State: [8] Failed Last error: Inconsistent shadow copy However I can't get any further. A few relevant facts: I get the error even if all the VMs are shut down If I disable the Hyper-V VSS Writer by stopping the Hyper-V Management Service backup completes OK There are no errors in the Hyper-V-VMMS application log I tried to set tracing for VSS but can't get any output for some reason. I set the correct registry entries but no trace log is generated. Tim

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• Setup a new domain controller over a temporary VPN, but now Windows delays startup?

  - by Kris Anderson

  I'm migrating servers from colo locations to Amazon's VPC EC2 instances. If anyone hasn't worked with Amazon VPC before, VPN is a pain in the arse! Anyways, I setup a new server that acts as the domain controller for our Amazon VPC. In order to migrate all the user accounts from our existing domain controllers I manually connected to our colo VPN using my user account on the new Amazon EC2 machine. I was able to join the domain and the new Amazon server became another domain controller on our network. So far so good. The problem I'm having is that when booting the EC2 domain controller (which is no longer connected to the VPN so it can't communicate with the existing controllers), it takes a good 6-8 minuted before I can remote into the server (instead of the 1-2 minutes it should take). Also, during this time most of the services we also run (like IIS) also give 404 errors until the 6-8 minutes have passed. It's almost like the domain controller is attempting to reach the other domain controllers first and after 6-8 minutes it falls back to the one located on the local machine? I don't think that's what's happening though, because Server 2008 R2 doesn't have primary and backup domain controllers. They're all equal as far as Windows is concerned. For my network adapter I have only one DNS listed, 127.0.0.1, so it should be looking up the local domain controller and not the other domain controllers it connected to over VPN when VPN was enabled. In the server logs I'm seeing these warnings pop up during a reboot: The winlogon notification subscriber is taking long time to handle the notification event (CreateSession). The winlogon notification subscriber took 409 second(s) to handle the notification event (CreateSession). Any ideas on what's happening here? I would try removing the existing domain controllers from the new Amazon EC2 machine, but I still need to connect over VPN a few times to migrate some data between the servers, and I don't want that change being reflected back to the other domain controllers in our colo locations.

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• How to backup/restore OSX Parental Controls before/after complete reimage?

  - by Jim Anderson

  We typically "nuke and pave" users Mac OSX laptops if they have software issue. Prior to doing so, we backup the primary (non-admin) user's home folder. Our standard image has four accounts: Admin (uber admin user); Parent (admin account for the parents of students); Loaner (so our standard image will also work for our loaner laptop pool); Student (this is the primary, non-admin user of the laptop) Our standard image has only minimal Parental controls on the Loaner and Student accounts. Some parents choose to tighten the parental controls. We never know when parents have made changes to parental controls, or what those changes are. Once we have reimaged the machine with our standard image (minimal parental controls) we would like to be able to restore any custom parental controls parents may have placed on their student's account. Any help in this would be appreciated. Thanks.

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• MSSQL Auditing Recomendations

  - by Josh Anderson

  As an aspiring DBA, I have recently been asssigned the task of implementing the tracking of all data changes in the database for a peice of software we are developing. After playing with microsoft's change data capture methods, Im looking into some other solutions. We are planing to distribute our product as a hosted solution and unlimited installations would be desired for maximum scalability. Ive looked at IBM's Guardium as well as DB Audit by SoftTree. Im curious if anyone has any solutions they may have used in the past or possibly any suggestions or methods to achieve complete, and of course cost effective, auditing of data changes.

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• What is the harm in giving developers read access to application server application event logs?

  - by Jim Anderson

  I am a developer working on an ASP.NET application. The application writes logging messages to the Windows event log - a custom application log just for this application. However, I do not have any access to testing or staging web/application servers. I thought an admin could just give me read access to this event log to help in debugging problems (currently a service that is working in dev is not working in test environment and I have no idea why) but that is against my client's (I'm a consultant) policy. I feel silly to keep asking an admin to look at the event log for me. What is the harm in giving developers read access to application server application event logs? Is there a different method of application logging that sysadmins prefer programmers use? Surely, admins don't want to be fetching logging messages for developers all the time.

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• Sas/Sata raid controller with dedicated management interface?

  - by Nick Anderson

  I am looking for an internal raid controller that has a dedicated Ethernet port for management. I would really like to have operating system independent management of the raid without having to drop to BIOS. For some reason I think I have seen these in the past but cant find any for the life of me now.

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• Fax in Small Business Server 2003 fails to hang up

  - by Tim Anderson

  We have a problem with fax in SBS 2003. External modem, Courier v Everything which is a recommended model. It receives a fax OK, but then sometimes (quite often) fails to hang up. Attempts to send faxes thereafter get an engaged tone. The only fix when this happens is to reset the fax modem. Even restarting the server is not enough. We've tried with a different model modem, same problem. Any ideas? Tim

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• Accessing multiple local HD's or RAID with ESXi 4.0

  - by Shawn Anderson

  How to I get additional HD's to be recognized and used by ESXi 4.0. When I purchased my system I had two 2TB HD's, but when I installed ESXi it only recognized one of them. I'm happy to get whatever number of drives that I need (I have a four bay SATA in my Dell T310). What are some options? RAID? If so, is it supported. I guess I would need hardware instead of software since ESXi is so small. The VMWare forums (where I've lived for the last two days) are a charlie foxtrot of outdated and conflicting info. I want to utilize my T310, with 32 GB RAM, 2.8GHz quad core to run many lab Windows VM's. I don't need production level availability but I do want decent performance, even though it's in a lab environment. A huge thanks to Jim B., Zypher, Helvick, and Jeff Hengesbach who posted answers to my earlier predecessor question on why ESXi was so sluggish.

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