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• Where is the actual content in a TCP segment

  - by packetloss

  When I email something or download a program, or do anything else over a network, where in the segment is the actual content? If I am emailing a 20KB word document, and the maximum data field size in a segment is 1500 bytes, does that mean it takes about 14 segments to mail my document wherever it is going? I get, I think, the OSI model and I have a decent grasp of the IP protocol. I think I understand the concept of header wrapping of each successive layer in the protocol stack. What I can't get a definitive answer to is where does the actual content go in a TCP segment? Is that the datagram? Maybe the fact I am asking proves I have no clue... Many thanks.

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• Firefox 3.5.6 Uninstaller not working

  - by Wesley

  Hi all, I want to uninstall Firefox 3.5.6 in favor of Opera 10.10. However, I've went into Control Panel Add or Remove Programs and tried clicking Remove from there, but nothing happens. I go into the Program Files for FIrefox and find the Uninstaller folder and click the helper.exe found in there. Still, nothing happens. Is there some possible way to uninstall Firefox without screwing up the rest of my computer? Computer is a EMACHINES T2482: http://emachines.com/support/product_support.html?cat=Desktops&subcat=T%20Series&model=T2482 RAM has been upgraded to 1 GB PC3200 DDR, GPU has been upgraded to 128MB GeForce 6200, HDD has been upgraded to 160 GB, PSU has been upgraded to 350W and Floppy and DVD Reader have been disconnected from mobo and power. OS is XP Pro SP3

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• How much processor speed and cores do I need for these tasks?

  - by ajay

  I am planning to buy a new laptop as I find my current one very slow. My question here is specifically related to RAM size and CPU power. I will mostly be doing development (not much games). I would be dabbling in distributed computing, multithreaded and data intensive parallelizable tasks on multi-cores. For e.g. I would want to be able to Concurrent programming in Scala/Java/Clojure etc. and be able to see parallelization. Furthermore, I would want the RAM to be enough. But from a developer machine standpoint, do you think 4GB RAM and 2.53GHz Dual Core processor would be enough. I'm basically looking at this model: http://store.apple.com/us/configure/MC118LL/A?mco=MTM3NDcyODk (link dead)

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• finding the user of iis apppool \ defaultapppool

  - by LosManos

  My IIS apppool user is trying to create a folder but fails. How do I find out which User it is? Let's say I don't know much about IIS7 but need to trace whatever is happening through tools. Place of crime is WinSrv2008 with IIS7. So I fire up Sysinternals/ProcessMonitor to find out what is happening. I find Access denied on a folder just as I suspected. But which user? I add the User column to the output and it says IIS Apppool\Defaultapppool in capitals. Well... that isn't a user is it? If I go to IIS and its Apppools and Advanced settings and Process model and Identity I can see clues about which user it is but that is only because I know IIS. What if it had been Apache or LightHttpd or whatever? How do I see the user to give the appropriate rights to?

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• Does vmWare ESXi 4.0 U1 support the Promise SuperTrak EX8650 SATA card?

  - by RTNN

  Hi, can anyone tell me if vmWare ESXi 4.0 U1 has support for the Promise SuperTrak EX8650 SATA card? In the hardware support guide I find that VmWare should have support for the Promise SuperTrak EX8650 SATA card but only in version ESX 3.5. Is this card not supported for ESXi 4.0 U1 or what? From the hardware guide! Partner Name Model Manufacturer Device Type Supported Releases Promise SuperTrak EX8650 Promise Technology Inc SAS-RAID ESX 3.5 U5*1 1 , ESX 3.5 U4*1 1 Promise SuperTrak EX8760T Promise Technology Inc SAS ESX / ESXi 4.0 U1*2 2 , ESX / ESXi 4.0*2 2

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• My Windows 8 computer does not come out of Standby

  - by Jikag

  My computer will not come out out of standby. It has had this issue ever since I bought it ~4 years ago. When I purchased it, It came with Vista, I have since upgraded it to 7 and now 8 Pro, each time hoping that it would fix the problem, each time finding that it did not. My computer is an HP Pavilion Model #: m9500y. The computer goes into standby, but does not come out of it properly. If Hybrid sleep in on, it does not respond at all. If Hybrid sleep is off, It comes out and I can see the desktop for a bit, but then the screen goes black again and I have to reboot. I have tried Running a sfc, and a chkdsk in case it's a corrupted file, but it hasn't helped. This isn't too serious an issue because I can just shutdown my computer and turn it on the old fashioned way, but it is annoying and I would appreciate some advice going forward as I'm currently stumped.

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• GNU/Linux: SAS-disk detected as /dev/sg7 - not as /dev/sdb

  - by Ole Tange

  I have just installed a SAS disk into a Debian server. It was detected correctly and everything was fine. Then I moved the SAS disk to a different Debian server, the same hardware model and running same version of Debian, but here the SAS disk is detected as /dev/sg7 and not /dev/sdb. smartctl -a /dev/sg7 works fine, but fdisk and cat hang. I tried putting the SAS disk in another slot: Same problem. How can I force the SAS disk to be detected as /dev/sdb? # uname -a Linux maxwell 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2+deb7u2 x86_64 GNU/Linux

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• Skipping scheduled self-tests and predicting drive EOL

  - by Steve Madsen

  For a few weeks now, smartd has been reporting that it is skipping some of its scheduled self-tests on the weekends: Apr 24 18:29:32 calvin smartd[4758]: Device: /dev/sda, skip scheduled Offline Immediate Test; 40% remaining of current Self-Test. Apr 24 18:29:33 calvin smartd[4758]: Device: /dev/sdb, skip scheduled Offline Immediate Test; 50% remaining of current Self-Test. The drives in this RAID-1 array are set to run an offline test four times a day, a short self-test at 2am every day, and a long self-test on Saturdays at 2am. For some reason, it looks like the long self-test is taking longer, causing the other scheduled tests to be skipped. First question: is this a sign of likely drive failure? Then today, smartd reported that a self-test failed. Here is the output of smartctl -a /dev/sdb: smartctl version 5.38 [i686-pc-linux-gnu] Copyright (C) 2002-8 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Model Family: Seagate Barracuda 7200.8 family Device Model: ST3250823AS Serial Number: 3ND1GNBC Firmware Version: 3.03 User Capacity: 250,059,350,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 7 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Sun Apr 25 13:15:34 2010 EDT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 430) seconds. Offline data collection capabilities: (0x5b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 1) minutes. Extended self-test routine recommended polling time: ( 84) minutes. SMART Attributes Data Structure revision number: 10 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 047 039 006 Pre-fail Always - 168450357 3 Spin_Up_Time 0x0003 098 098 000 Pre-fail Always - 0 4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 33 5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 9 7 Seek_Error_Rate 0x000f 087 060 030 Pre-fail Always - 654745480 9 Power_On_Hours 0x0032 055 055 000 Old_age Always - 40141 10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 51 194 Temperature_Celsius 0x0022 037 062 000 Old_age Always - 37 (0 17 0 0) 195 Hardware_ECC_Recovered 0x001a 047 039 000 Old_age Always - 168450357 197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0000 100 253 000 Old_age Offline - 0 202 TA_Increase_Count 0x0032 100 253 000 Old_age Always - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Short offline Completed without error 00% 40131 - # 2 Extended offline Completed: read failure 30% 40129 379795511 # 3 Short offline Completed without error 00% 40084 - # 4 Short offline Completed without error 00% 40060 - # 5 Short offline Completed without error 00% 40036 - # 6 Short offline Completed without error 00% 40013 - # 7 Short offline Completed without error 00% 39990 - # 8 Extended offline Completed without error 00% 39977 - # 9 Short offline Completed without error 00% 39919 - #10 Short offline Completed without error 00% 39895 - #11 Short offline Completed without error 00% 39872 - #12 Short offline Completed without error 00% 39848 - #13 Short offline Completed without error 00% 39824 - #14 Short offline Completed without error 00% 39801 - #15 Extended offline Completed without error 00% 39789 - #16 Short offline Completed without error 00% 39754 - #17 Short offline Completed without error 00% 39732 - #18 Short offline Completed without error 00% 39707 - #19 Short offline Completed without error 00% 39683 - #20 Short offline Completed without error 00% 39660 - #21 Short offline Completed without error 00% 39636 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. Given that this drive is about 4.5 years old, I am probably tempting fate by keeping it in service. SMART doesn't seem to get much respect as a reliable way to predict drive failure. What else can I use to get an early indication of drive failure?

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• Reverse Engineer a .pyo python file

  - by Brian

  I have 2 .pyo python files that I can convert to .py source files, but they don't compile perfectly as hinted by decompyle's verify. Therefore looking at the source code, I can tell that config.pyo simply had variables in in an array: ADMIN_USERIDS = [116901, 141, 349244, 39, 1159488] I would like to take the original .pyo and disassembly or whatever I need to do inorder to change one of these IDs. Or.... in model.pyo the source indicates a if (productsDeveloperId != self.getUserId()): All I would want to do is hex edit the != to be a == .....Simple with a windows exe program but I can't find a good python disassembler anywhere. Any suggestions are welcomed...I am new to reading bytecode and new to python as well.

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• Toshiba eStudio 281c turn off snmp in driver.

  - by Matt

  I have a customer with an eStudio 281c colour copier/printer and I'm having an issue with terminal services. Basically, the driver has the ability to query the printer for its configuration over snmp. I've set it to manual rather than auto so it's effectively switched off. Trouble is, when logging into terminal services it's still trying to communicate with the printer. This is an issue because when it fails it then defaults to being a different printer model with a different tray configuration. Users can still print but the settings are wrong. Any ideas?

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• Can a Shadow Copy of SQL 2000 databases files be used as a restore?

  - by Keith Sirmons

  Howdy, I have a SQL 2000 instance (version 8.00.760) that is on a drive that gets regular shadow copies. Can a shadow copy be used to restore the database? It seems possible to stop the SQL service, restore the Data folder from the shadow copy (includes msdb, master, model, temp, and the user databases, then restart the service. Would the files be in a crash consistent case in the worst case? If so, when restarting the service wouldn't it recover as if the power were pulled from the server? Thank you, Keith

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• No dual cpu support for VirtualBox with a CPU that doesn't support multicore?

  - by djangofan

  With VMWare it works fine and I can run multiple cores on a VMWare image. With Sun VirtualBox I can only run 1 cpu on a image. Its annoying. Why does Sun Virtualbox not work the same as VMWare in this respect?? My CPU is: XEON 3.00GHz Intel 90nm 2MBCache QUAD CPU x14 Socket 604 mPGA Family 15 Model 4(04) Stepping 3 Revision 05 MMX SSE3 XD SIV.exe tells me: No virtual machine extensions x86 with 64-bit support NO IA64 support MPS but with NO MCP 2 physical processors, 2 cores, 4 logical processors

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• Website with large number of users keeps going down due to memory leaks:Tomcat6 and Java 6

  - by user1766478

  We host many websites on one of our two virtual servers. We use tomcat 6 and Java 6. It is an MVC model with a hibernate like layer. The problem is, one of our biggest clients with the most number of members, keeps crashing the server every 6-8 hours(precisely in the mornings when most members login) We have been having this issue for 4 days now. Trying to figure out the problem but we suspect memory leaks. Any suggestions?

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• Modeling RBAC actors using LDAP (Core X.5xx)

  - by Tetsujin no Oni

  Mirrored from stackoverflow... When implementing an RBAC model using an LDAP store (I'm using Apache Directory 1.0.2 as a testbed), some of the actors are obviously mappable to specific objectClasses: Resources - I don't see a clear mapping for this one. applictionEntity seems only tangentially intended for this purpose Permissions - a Permission can be viewed as a single-purpose Role; obviously I'm not thinking of an LDAP permission, as they govern access to LDAP objects and attributes rather than an RBAC permission to a Resource Roles - maps fairly directly to groupOfNames or groupOfUniqueNames, right? Users - person In the past I've seen models where a Resource isn't dealt with in the directory in any fashion, and Permissions and Roles were mapped to Active Directory Groups. Is there a better way to represent these actors? How about a document discussing good mappings and intents of the schema?

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• Partitions on Linux and their CHS dependance

  - by FractalizeR

  Hello. Recently I came into a problem with partitioning WD20EARS disk (with 4k sectors). I needed partitions to be aligned correctly so I just used parted in "unit s" mode and started all partitions at mod8 sector (drive itself reports, that sector is 512b) and ended all of them at mod8-1 sector. But then I thought, that may be I should take into account also the cylinder boundaries (I've seen some posts on the net where fdisk complains about partitions not to start/end on cylinder boundary). And then... I thought, that if drive lies about it's sector size, may be it's lying about the whole geometry? Should I care about partitions to be aligned against cylinder boundaries? If so, how do I find these boundaries? I guess each drive model can contain different sectors per track/cylinder... Or sector alignment is all I should take care of?

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• Good fractal visualizer

  - by Gnoupi

  Each time it's the same thing, I find one, then I forget the name of it the next time I want to "dive" into such things. I'm looking for a good fractal "visualizer". The kind in which you just select a well-known fractal model (or variations on it), and in which you can then "dive" into, just zooming in or out smoothly, for the cheer pleasure of losing yourself in it. I'm looking for an executable, preferably for Windows, but any OS accepted. Keep to one program per answer (and one answer per program), as this is community wiki.

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• Acer Aspire 3820TG video card driver issue for Windows 8 Pro

  - by supernx

  The model for Acer laptop is ATI mobility Radeon 5650. I am using Windows 8 Pro from MSDN. It was working fine until two days ago when Microsoft pushes an update. After the update, my video card stops working and I only see black screen after loading splash screen. I can go in Safe Mode. I tried to install driver from AMD website but it failed with error message "load detection driver failed". Anyone else have the same issue? Any idea how to solve this? I need to go in Win8 for my latest development.

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• How to setup a simple self-hosted dynamic DNS server

  - by Cerin

  I have a small internal network of physical machines running hypervisors, which in turn run several KVM Ubuntu virtual machines. How would I setup an internal dynamic DNS server so that when I run a script to create a new virtual machine, that VM could automatically register itself in the DNS server? Bind seems to be the standard DNS server for Linux, but it seems designed for a much more "static" DNS model. Dynamically updating this would require a complicated script that would have to SSH into the DNS server, edit configuration files, and then restart the server. This doesn't seem like a very elegant solution. Are there better options? I saw a similar question, although they're asking for a solution for a public setting on Amazon. My servers are entirely private, and I don't want to rely on an external VM host or Dynamic DNS provider.

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• Sound stopped working on Toshiba Satelite C855

  - by Eric Wilson

  I have a Toshiba Satallite C855 running Windows 7 with a Realtek High Definition Audio card. Sound worked fine yesterday. Today, my two-year old did something to the machine, and I have no sound. I have adjusted sound through the icon in the lower right corner, and using the Fn keys. I have rebooted. I've verified that there are no external speakers plugged in to the laptop. It seems that this model does not have an external volume control. (If it does I can't find it.) Any ideas?

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• Upgrading NAS hard drives

  - by Mihai Damian

  I was thinking of buying a NAS for home-usage. I've never used a NAS or had HDDs set up in Raids. Before I commit myself to moving all my data to a NAS I need to find out how difficult it is to upgrade and replace the NAS' hard drives. Suppose I set up a Raid 1 NAS with two 1TB hdds. At some point in the future I will use up all the space and will have to install two new 2TB hdds. Now I'll need to migrate the data from the old disks to the new ones. Will I have to hook up one of the old disks in a computer and copy all the data back in the NAS? Or can the migration be done using only the NAS? I realize the answer to the question might depend on the NAS model. Being a simple for-home solution I was thinking of getting something along the lines of D-link's 323.

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• Why did windows change the elevation requirements of my AutoHotKey script, and how can I prevent such in the future?

  - by monsto

  I was working on an AutoHotKey (AHK) script to create prefab mouse movements for a very simple model viewer. I worked on it for a good hour. I zipped the script, posted it to a forum, and thought "oh hey, I should add bla bla bla to the script". When I returned to the program, the AHK script would not work. I could see the mouse movements working in other programs (notepad, chrome, etc), but not where I had been working the previous hour. After several hours of throwing darts at the troubleshooting wall, I discovered that the fix was to set the AHK.exe to Run as Administrator. The question here are multiple Why did Windows 7, in all it's wisdom, suddenly decide that elevation was necessary in the middle of usage? Can these permission requirements somehow be reverted by, say, removing a key from the registry or something? How can this kind of Windows behaviour be avoided in the future?

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• Help importing video from old Sony digital tape HandyCam

  - by thatryan

  Some friends gave me their old HandyCam and a bunch of tapes asking me to put them on a DVD. The model is Sony DCR-TVR103 and it records onto Hi8 digital tapes. It has a firewire port also. I am trying to use import function in iMovie on OS X 10.6. Every import though the video is super fast, like playing in fast forward. Ever seen anything like this? How can I import this video? Thank you.

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• What all laptops can replace a compaq presario v2000's monitor ?

  - by Nishant

  I am planning to buy laptop for parts/repair from Ebay to replace by broken LCD of Compaq presario v2000 . I know the monitor is 14" WXGA and LTNW140-l01 model made by samsung . I have removed the LCD panel and I can see 2 cables , one power and other video signal Can I buy a 14.1" LAPTOP and fit to this ? 14.1 WXGA seems very common . Please can any one tell which all laptops can replace this monitor ? I know HP DV 1000 does ? Any advices would be great .

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• Cannot boot from windows 7 DVD

  - by webnoob

  Hi All, I have just purchased windows 7 64bit. I entered the disk in the drive and it told me I couldn't upgrade as I am using XP so I have tried to boot from CD instead but it doesn't work. It seems to look at the disk for a few seconds and then ends up at a screen saying windows failed to start and then I hit enter and it loads windows XP again. Does anyone know what could cause this? Here is my system info: Time of this report: 4/15/2010, 18:11:39 Machine name: MYCOMP Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.100216-1514) Language: English (Regional Setting: English) System Manufacturer: Dell Inc. System Model: OptiPlex 755 BIOS: Phoenix ROM BIOS PLUS Version 1.10 A09 Processor: Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz (2 CPUs) Memory: 3316MB RAM Page File: 568MB used, 4631MB available Windows Dir: C:\WINDOWS DirectX Version: DirectX 9.0c (4.09.0000.0904) DX Setup Parameters: Not found DxDiag Version: 5.03.2600.5512 32bit Unicode

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• Cannot boot from windows 7 DVD

  - by webnoob

  Hi All, I have just purchased windows 7 64bit. I entered the disk in the drive and it told me I couldn't upgrade as I am using XP so I have tried to boot from CD instead but it doesn't work. It seems to look at the disk for a few seconds and then ends up at a screen saying windows failed to start and then I hit enter and it loads windows XP again. Does anyone know what could cause this? Here is my system info: Time of this report: 4/15/2010, 18:11:39 Machine name: MYCOMP Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.100216-1514) Language: English (Regional Setting: English) System Manufacturer: Dell Inc. System Model: OptiPlex 755 BIOS: Phoenix ROM BIOS PLUS Version 1.10 A09 Processor: Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz (2 CPUs) Memory: 3316MB RAM Page File: 568MB used, 4631MB available Windows Dir: C:\WINDOWS DirectX Version: DirectX 9.0c (4.09.0000.0904) DX Setup Parameters: Not found DxDiag Version: 5.03.2600.5512 32bit Unicode

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