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  • SMB2 traffic crashes network?

    - by Phil Cross
    We've been having significant network slowdown issues over the past few weeks, primarily on a Friday morning. We run Windows 7 client machines, with Windows Server 2008 R2 servers. What generally happens is the network starts to slow down massively at 08:55 and resumes normal speeds at around 09:20 This affects everything on the network from logging on, resetting passwords, opening programs and files etc. On my client machine, Physical Memory usage remains at around 40% (normal) and CPU usage hovers around 0-10% idle. The servers show memory usage spikes massively and remains quite intense during the times mentioned above. I have taken several wireshark captures, both during the slowdown and when the network operates fine. One of the main things I noticed is the increase in SMB2 entries in the wireshark log during the slowdown. Record Time Source Destination Protocol Length Info 382 3.976460000 10.47.35.11 10.47.32.3 SMB2 362 Create Request File: pcross\My Documents 413 4.525047000 10.47.35.11 10.47.32.3 SMB2 146 Close Request File: pcross\My Documents 441 5.235927000 10.47.32.3 10.47.35.11 SMB2 298 Create Response File: pcross\My Documents\Downloads 442 5.236199000 10.47.35.11 10.47.32.3 SMB2 260 Find Request File: pcross\My Documents\Downloads SMB2_FIND_ID_BOTH_DIRECTORY_INFO Pattern: *;Find Request File: pcross\My Documents\Downloads SMB2_FIND_ID_BOTH_DIRECTORY_INFO Pattern: * 573 6.327634000 10.47.35.11 10.47.32.3 SMB2 146 Close Request File: pcross\My Documents\Downloads 703 7.664186000 10.47.35.11 10.47.32.3 SMB2 394 Create Request File: pcross\My Documents\Downloads\WestlandsProspectus\P24 __ P21.pdf These are some of the SMB2 records from a list of a couple of hundred which original from my computer with a destination of the fileserver. One of the interesting things to note is the last entry in the examples above is for a PDF file. That file was not open anywhere on my computer, or on anyone elses. No folders with the files in were open either. When I took another capture when the network was running fine, there were hardly any SMB2 entries, and the ones that were displayed were mainly from Wireshark. We currently have around 800 computers, 90 Macs and 200 Laptops and Netbooks. Our concern is if this traffic is happening on my computer, is it happening on other computers, and if so, would those computers be adding to the slow network issues? Again, this only happens during certain times. We're pretty sure its not the our antivirus. Is there anything to narrow down whats initializing this SMB traffic during the particular times? Or if anyone has any extra advice, or links to resources it would be appreciate.

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  • Free solution to backup folders to external SFTP server with shadow copy

    - by Sergiy Byelozyorov
    I have an account in university on Linux machine with 10TB of free space accessible via SFTP. I would like to backup my Windows 7 x64 laptop to university. Currently I am using rsync+cygwin, but backup is pretty slow (without shadow copy) and I hate console window appearing every day on my screen when I login. So I am looking for something like Windows Backup but with support for SFTP. Combination of tools will work too.

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  • How to make Ultra VNC viewer faster ?

    - by karthik
    I am trying to share the screen of a system A to another system B. The normal screen sharing is good. But when i run a 3-D program in System A and try to view it from System B, i see the screen frame by frame. The response time is too slow. My Req. is to show the 3-D program to another person. How can i make VNC faster, to its best ?

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  • How to make Ultra VNC viewer faster ?

    - by karthik
    I am trying to share the screen of a system A to another system B. The normal screen sharing is good. But when i run a 3-D program in System A and try to view it from System B, i see the screen frame by frame. The response time is too slow. My Req. is to show the 3-D program to another person. How can i make VNC faster, to its best ?

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  • copy windows registry and/or other locked files

    - by karolrvn
    Hi. While improving my (personal) backup system, I noticed, that I cannot copy certain locked files, like the windows registry files. Is there a way to copy such things? Or a specific solution for the registry (I know of the regedit-File-Export ,,solution'' but this is to text format and seems slow). AFAIK, On Linux the locking system is advisory and on Windows it is mandatory. Can I somehow bypass the mandatory-ness for backup purposes etc.? TIA.

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  • Queston about torrents

    - by c0mrade
    Why do my torrents go at rate 25/30 kb/s and my regular http downloads rate up to 300 kb/s .. is my ISP to blame for this, I meant torrents have like thousand seeders and again its very slow.How are they blocking torrent speed, can I bypass it?

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  • Debian (wheezy) force cache to RAM

    - by Marek Javurek
    I have Linux server running about 6 game servers. I have 3 GB total of RAM but I use only about 500 MB. Is there a way to cache one of my game servers (all the files - even not actually used maps etc. - about 1,5 GB) to RAM? The reason I want to do this is because my Linux server is virtual and the hard drives ar very slow, so there is really big IO wait time. IO: http://i.stack.imgur.com/7HLhB.png

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  • How to switch between the upper and lower pane in emacs?

    - by Anthony Kong
    I am using the erlang mode in Aquamacs. The mode, by default, creates a new pane and buffer "*erlang*" when I hit C-C C-K to compile an erlang file. (as seen in the attached screen shot) What is the easiest way to switch between these two panes? I do not think "C-x b" is applicable in this case because 'C-X b' then "*erlang" is slow considering I have to switch between my files and the erlang shell rather frequently.

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  • How to retrieve names of all private MSMQ queues - efficiently?

    - by Damian Powell
    How can I retrieve the names of all of the private MSMQ queues on the local machine, without using System.Messaging.MessageQueue.GetPrivateQueuesByMachine(".")? I'm using PowerShell so any solution using COM, WMI, or .NET is acceptable, although the latter is preferable. Note that this StackOverflow question has a solution that returns all of the queue objects. I don't want the objects (it's too slow and a little flakey when there are lots of queues), I just want their names.

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  • VMWare Esxi Looking for Bottlenecks

    - by nextgenneo
    I have a VMWare ESxi box, 22GB ram, Dual Quad Core Xeon, 2 Sas drives + Write caching raid controller etc. Anyways, have about 30 small XP VM's running on it and starting to get some very slow boot times and other performance issues. I THINK its I/O but looking at the graphs not too sure what to look for. Any ideas on what to look for would be appreciated. Here is the data I've got so far: (I feel like my IO is high but not sure what to bench it against)

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  • Persistent Issues on small business network using Cisco 871W and Catalyst Express 500

    - by Ben Campbell
    Being the most qualified (read: still not qualified) to solve our persistant network issues, I've turned to serverfault for guidance. I've done some searching, reading related documentation on cisco.com and tried a bit of troubleshooting. Here is the config: 100mb synchronous connection from a business internet provider (tested multiple times at 100meg at the source) Cisco 871W wireless point & router is where the WAN connection starts (this serves all our wireless). The only wired connection in the 871W is the Catalyst switch listed below. Cisco Catalyst Express 500 (24TT) is where all the wired connections terminate. About 20 Windows workstations and servers (AD/Webservers only). Some services in EC2 including mail and other web servers/apps. I've been TOLD cabling internally should be gigabit-ready. Here are the problems: generally slow download rates from the internet to the desktop/laptop frequent "page cannot be displayed" errors in browsers-sometimes 3 or 4 reloads are necessary... often times CSS wont load or other content requiring the browser to connect to a different server. slow speed within the LAN from workstation to workstation copying files. I would expect extremely fast data transfer workstation to workstation / server to workstation in this simple network. Several things I need to admit: I'm not primarily a network guy. Funding is relatively low, I need to be the guy that finds the solution. I understand most of the terminology and most of the technology. Implementation is where I fail due to lack of experience. Getting to the point: I'm wondering whether experienced network admins think that our small network should be sufficiently served with our current hardware if configured properly... or if we should purchase new equipment and start fresh? If starting fresh is the plan, whatever that new equipment may be is a likely different question entirely. If I haven't provided enough information, I will happily do some troubleshooting and update with the results. I have experience using wireshark and some other tools. Please let me know what you think would be most helpful and thanks in advance. EDIT: I forgot to add that the Cisco applicance will not finish loading the SDM Express console. It hangs every time at the "populating modules... DHCP". It eventually crashes and closes. I've rebooted the hardware and this still happens.

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  • Fast window switching without Alt-Tab or Command-Tab?

    - by Sridhar Ratnakumar
    Alt-Tab or Command-Tab can sometimes be slow, especially when you have many windows open and you frequently switch to only a few of those windows. How do you work around this problem -- any tool to switch to desired windows (most frequently accessed) directly, other than tapping the Alt-Tab combination multiple times? Note: This should work on Windows 7, Linux and Mac. Update: Please post your keyboard-shortcut solutions (using the mouse cannot be any faster - especially when you were touch-typing/writing-code before switching to a window).

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  • ASP.NET web application can't find an assembly

    - by Charlie Somerville
    I deployed an ASP.NET web application last night and I when I woke up this morning it was very slow and would occasionally just throw a 'Service Unavailable' error. I checked the Event Viewer and it was filled up with these errors: I'm puzzled as it was working perfectly when I deployed it (MonoTorrent is required to retrieve the number of seeders/leechers for a certain torrent off the tracker - this was working fine), but it's no longer working and whenever code that uses MonoTorrent gets involved, the worker process just crashes. MonoTorrent.dll is in the /bin/ directory.

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  • How to disable "Attachment Execution Service" in Windows?

    - by netvope
    If I run an executable file downloaded from the Internet, Windows displays a warning that this file can potentially harm my computer. This happens even for files downloaded by Firefox (not just IE.) On networked drive, this seems to slow down program launch time a lot. From Wikipedia, I learned that the feature is called "Attachment Execution Service". How can I completely disable it? If this cannot be done, how can I instruct Firefox not to set the "downloaded" flag on the file?

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  • internet disconnects

    - by Smokezzaj
    Internet disconnects and reconnects, computer is in a peer to peer workstation with two other computers XP o/s. Only one computer has this problem the other two don't disconnect. Computer's connect to switch no router is being used. Ipconfig shows a DHCP connection, local area connection status shows packets being sent out but packets are not being received or being received at a extremely slow rate. Tried Winstock tool, reinstalling network card driver, restored to previous date, checked ethernet cable and release/renew IP.

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  • D-Link DIR-300 slows down / loses network

    - by basic6
    Hi there, there are 2 buildings (A and B). In bldg A is an open WLAN (which I'm allowed to use btw). In bldg B is a computer that I want to connect to that network. So I flashed an old D-Link DIR-300 AP with DD-WRT, mounted it to the wall (bldg B) near a window, attached a 13 dBi directional antenna (pointing to bldg A) and configured it as AP client in that wireless network. Then there's another AP, connected to the D-Link AP, acting as standard access point, which the computer is connected to. That's basically working so far, but: Every now and then the connection is lost. Not the connection between the computer and the D-Link (I can access the DD-WRT admin page normally) or the connection between the D-Link and the WLAN (in Status - Wireless it says it's still connected to the network), but when I want to access a web page (which only works if I'm connected to the wireless network from bldg A), my Firefox keeps "Looking for" (name resolution) without finding anything. When I reset the D-Link (power off, power on) in this situation, after some moments, everything's working fine again (Internet access). I've no idea why this is happening, but usually it's at most every few weeks (most times when nobody was using the computer, so no traffic). Compared to the connection speed when I connect directly to the WLAN in bldg A (Laptop), the speed in bldg B is rather slow, but I have the impression that this difference is worse in the last few days. A few minutes ago, I got 582 KB/s down and 911 KB/s up in bldg A (directly/laptop) and 84 KB/s down and 9 KB/s up in bldg B. The speed in bldg B used to be way higher (I remember 200 KB/s up) while the actual network speed in bldg A was lower than it is now (close to those 200). I'm aware that the wireless connection between those buildings should slow things down, but I'm wondering why this difference has become that extreme. Thanks for any tips... Update: I currently want to upload a large file (1.5 GB) via FTP (FileZilla). Since that caused the D-Link to disconnect (as described in first post), I took my laptop to bldg A, connected directly to the original WLAN (bypassing my D-Link) and tried the same upload. Guess what - same issue: At some point the connection is dead (at this point I would have reset my D-Link if I was connected to it). Just as the D-Link, my laptop is still connected, but not even name resolution is working ("Looking for..." in Firefox). After reconnecting, it's working again. Maybe my D-Link isn't the problem at all...

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  • How can i recover a zip password using CUDA (GPU) ?

    - by marc
    How can i recover a zip password on linux using CUDA (GPU). For the past two days i tried using "fcrackzip" but it's too slow Few months back i saw some application that can use GPU / CUDA and get large performance boost in comparison to CPU. If brute-force using cuda is not possible, please tell me what's the best application for performing a dictionary attack, and where can i find best (largest) dictionary. Regards

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  • possible wildcard cname setup

    - by majestiq
    I'm trying to do the following: get a cname setup so that *.subdomain.domain.com points to anotherdomain.com. Then in the anotherdomain.com DNS, I want to look for things like one.subdomain.domain.com and point it to another server and two.subdomain.domain.com pointed to a fourth server. Is this possible in any way? I need that wildcard cname initially because our IT department is very slow in assigning additional CNAMEs. Any help would be appreciated here.

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  • Autoloading Development or Production configs (best practices)

    - by Xeoncross
    When programming sites you usually have one set of config files for the development environment and another set for the production server (or one file with both settings). I am assuming all projects should be handled by version control like git or svn. Manual file transfers (like FTP) is wrong on so many levels. How you enable/disable the correct settings (so that your system knows which ones to use) is a problem for me. Each system I work on just kind of jimmy-rigs a solution. Below are the 3 methods I know of and I am hoping that someone can submit a more elegant solutions. 1) File Based The system loads a folder structure based on the URL requested. /site.com /site.fakeTLD /lib index.php For example, if the url is http://site.com then the system loads the production config files located in the site.com folder. However, if I'm working on the site locally I visit http://site.fakeTLD to work on the local copy of the site. To setup this I edit my hosts file and add site.fakeTLD to point to my own computer (127.0.0.1/localhost) and then create a vhost in apache. So now I can work on the codebase locally and then push to the server without any trouble. The problem is that this is susceptible to a "host" injection attack. So someone loading site.com could set the host to site.fakeTLD and then the system would load my development config files instead of production. 2) Config Based The config files contain on section for development - and one for production. The problem is that each time you go to push your changes to the repo you have to edit the file to specify which set of config options should be used. $use = 'production'; //'development'; This leaves the repo open to human error should one of the developers forget to enable the right setting. 3) File System Check Based All the development machines have an extra empty file called "development.txt" or something. Each time the system loads it checks for this file - if found then it knows it is in development mode - if missing then it knows it is in production mode. Since the file is NEVER ADDED to the repo then it will never be pushed (and checked out) on the production machine. However, this just doesn't feel right and causes a slight slow down since all filesystem checks are slow.

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  • How to scale bandwidth of a startup website?

    - by EmpireJones
    I would like to host a website using my home internet connection, with multiple computers acting as nodes of web server, db, apache cassandra clusters, and memcached clusters. When this website gets to the point where I outgrow my slow home internet connection, what is the easiest/best way to scale the internet bandwidth?

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  • Software to aid using camera as a scanner

    - by xxzoid
    I want to digitize some index cards with my camera. I'm looking for a program that would automatically fix geometry on the shots (as you would expect the cards come tilted on the picture). I have an app (droid scan lite) on my android phone that does exactly that, but I would prefer to do it on my pc (the phone camera has poor quality and it's slow and focuses badly while I have a decent slr). If the program is open source it's an advantage, cross platform -- even more so.

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