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  • Debugging "clogged" TCP connections

    - by Nikratio
    I'm having trouble with an internet connection that seems to randomly "freeze" arbitrary tcp connections. The connections stay established, but no data is coming through. When this happens, netstat still shows the connection status as ESTABLISHED on both the local computer: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 53 192.168.0.10:41129 173.255.235.238:143 ESTABLISHED 8219/gnutls-cli on (79.31/13/0) ..and the remote server: Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name Timer tcp 0 0 173.255.235.238:143 68.5.174.98:41129 ESTABLISHED 5303/imapd off (0.00/0/0) However, it seems that no data at all is transferred. If I run strace on the local and remote process, both just show a repeating sequence of select calls (with different fds of course), e.g. select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) select(6, [0 5], NULL, NULL, {0, 50000}) = 0 (Timeout) The internet connection overall does not seem affected, I can still establish new connections to the same service on the same server without any problems. However, the affected local applications seem to be unaware of the problem and just hang. When I look at a packet capture of this connection on the client side, the last thing that happens is that the client transmits some data, then nothing happens for about 1100 seconds, and then several TCP Retransmission requests go out, with intervals increasing from 4 seconds to 130 seconds. No activity is captured after that. After about 10 minutes, the connection on the remote end disappears from the netstat (I wasn't able to catch any intermediate state), but still stays ESTABLISHED on the local end. Finally, after some more minutes, the local application aborts with a timeout and disappears from the local netstat output as well. Does anyone have a suggestion of how I could debug this further to find out where the problem lies and how to fix it? Additionaly and/or as a temporary workaround: is is there some way to globally reduce the timeout on client and/or server to reduce the time before the local application aborts?

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  • Debugging a Drobo that chokes Windows 7x64 When Plugged In

    - by Pridkett
    I've had a love hate relationship with my Drobo for a long time. After two years of using it on a Linux box, I moved it over to a Windows 7 machine where it seemed to work just fine for a long time, but it was under very light usage. Mainly backups that never actually happened. Recently I began using it for additional backup services (through CrashPlan, which is great). This means the Drobo gets a lot more usage. Also it means that something interesting happens, the Drobo can choke my system on startup. Here's what I mean: Start computer without Drobo plugged in, CrashPlan and Drobo Dashboard services disabled: 105s Start computer with Drobo plugged in Crashplan disabled, Drobo Dashboard enabled: 250s (and 1 cpu at 100% for a very long time, drobo churning) Start computer with Drobo plugged in, CrashPlan and Drobo Dashboard disabled: 250s (1 cpu at 100% for a very long time, drobo churning) Start computer with Drobo plugged in, Crashplan and Drobo Dashboard enabled: 300s (1 cpu at 100% for a very long time, drobo churning) If I yank the USB plug on the Drobo the CPU usage goes down to nothing very quickly. The slow startup in the fourth scenario is because CrashPlan is trying desperately to load stuff up on the H: drive before it gives up, so I've disabled it for the time being. So here's my question: What the heck is going on when I plug the drobo in? I've fired up Process Explorer and see that the System process is hogging the CPU, specifically it's an ntoskrnl.exe/KdPollBreakIn thread that's going ape. Is this something that's wrong with Drobo? Windows? Any idea on how to find out? If it matters, here's tech info: Athlon 64x2 4400, 2GB RAM, Win7 Ultimate, Drobo USB (2x1TB, 2x320GB)

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  • Software Diagnostics Tool recommendations for Debugging a Windows 8 freeze

    - by Stuart
    I've had my HP Pavillion dv6 laptop since last November - and it has had 8GB RAM and a 256GB Crucial M4 SSD installed since the start. I use it for software development and it's had a Windows 8 RTM installation since early September. Yesterday I had to give a presentation at a customer site - so used Powerpoint for the first time since installing Win8... since that point my machine has 'frozen' every 2 hours or so after startup. There doesn't seem to be any easy to see reason behind the freeze - the system just freezes, even if I have left it idle with just a desktop there. My immediate suspicion is that the SSD is the mostly likely cause of the problem. I've looked at some of the questions on here - e.g. How do I troubleshoot hardware issues related to a computer freeze/crash? - but don't really want to start taking my laptop apart. Another suspicion is that this might be related to the WiFi adapter (Broadcom 802.11n) since I have noticed that this doesn't seem to play perfectly with things like Hyper-V in Win8. Can anyone recommend any software diagnostic tools that I can run in order to evaluate the health of the SSD or of other parts of the system? Thanks Stuart P.S. I doubt Powerpoint is the cause of this, but I may use it as an excuse never to use it again... More realistically perhaps something got damaged during travel to the customer site?

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  • System Center Configuration Manager 2007 - Debugging Client Installs

    - by Dayton Brown
    Hi All: Having an issue installing the CCMsetup client on desktops. The CCMSetup makes it to the PC, files are there, it gets added to the services for automatic start, it starts, but quits almost instantly. Logs on the desktop show a entry like this. <![LOG[Failed to successfully complete HTTP request. (StatusCode at WinHttpQueryHeaders: 404)]LOG]!><time="14:28:51.183+240" date="06-11-2009" component="ccmsetup" context="" type="3" thread="2388" file="ccmsetup.cpp:5808"> What am I missing? EDIT: Firewall is off on both client and server.

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  • ARM Linux kernel debugging on AT91SAM9261

    - by agg
    I have ported Linux to AT91SAM9261 board, I have compiled my own Bootstrap, Uboot, Kernel and filesystem. Now I want to debug my Linux kernel 2.6.30 using KGDB and GDB. I have host with Ubuntu installed and target (AT91SAM9261) with kernel 2.6.30, I want to debug my Linux kernel 2.6.30 using serial/Ethernet. In KGDB official site they have given KGDB patch for x86, but not for ARM. Is it possible to debug my ARM linux kernel on AT91SAM9261?

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  • Dummy HTTP server for debugging

    - by Andrea
    This is more or less the inverse of my previous question. I need to debug some HTTP requests that I am making. Since these requests arise from the use of some external libraries, sometimes I am not sure of what is the actual data I am sending. Is there some dummy server (for Linux) that accepts HTTP requests and just prints them somewhere so that I can inspect them? I would like to be able to see in plain text the full request, like POST /foo HTTP/1.1 Host: www.example.com Accept: text/xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5 Accept-Language: en-gb,en;q=0.5 Content-Type: text/plain Content-Length: 11 Hello world

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  • terminal tools and logs for debugging TCP issues

    - by kellogs
    I have a server which I am testing for functionality (not load, not stress) with tsung. 50 users / second, 100 total users. Judging from tsung (tsung is the testing framework) graphs, there TCP connections (red line) drops to 0 while the commenced user sessions (green line) does not. Server logs show nothing to be gripping onto, so I am speculating some kind of TCP issue. Should this be the case ? Where would I look further on the server, any logs / tools to be looking at ? Only SSH available, no GUI. > root@XMPP:~# cat /etc/lsb-release > DISTRIB_ID=Ubuntu > DISTRIB_RELEASE=11.10 > DISTRIB_CODENAME=oneiric > DISTRIB_DESCRIPTION="Ubuntu 11.10" Thank you

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  • Debugging Windows PC freeze

    - by Violet Giraffe
    I have a problem with my computer, would appreciate any hints/ideas. It usually begins not immediately after booting Windows, but at some unpredictable point in time, which doesn't seem to correlate with any specific actions of mine. First sign of a problem is process System starting to consume 25% CPU time steadily. I have a quad-core CPU, so it might be one thread working non-stop. At this point micro-freezes start to occur - screen stops refreshing, but if I have, say, music player running - it continues playing. If I try to do something between the freezes, like open Start menu, it will freeze completely and forever. If I press reset button the PC will shut down and then start cold, as opposed to usual reset behavior (which doesn't include PC shutting down). I have noticed that full restart upon reset is usual for hardware problems, but I think this problem isn't related to at least motherboard-CPU-RAM-videoadapter. It certainly isn't caused by overheating. One very important not is that it seems to be related to Windows hosted WLAN network: I have USB Wi-Fi dongle and have configured a hosted network to share cable Internet connection with Wi-Fi devices. I am not 100% certain there's a strong connection, but in 9 or 10 cases when I enabled the network (by executing netsh wlan start hostednetwork), it did freeze eventually (sometimes within minutes of starting the network, sometimes within hours), and on at least 10 days when I didn't start the network it never froze, no matter how I used the computer). There are no critical/error entries in the events log that I can suspect as being related, only regular stuff like "driver not loaded". I have found no critical/error events that are being logged around the time of freeze occurring and are not logged during normal boot without starting the WLAN.

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  • Debugging taking a lot of time?

    - by Surya sasidhar
    hi, yesterday i install visual studio in my system, when i run my application it is taking a lot of time to run my application, i think it is due to virus. can u please tell me which is the best anti-virus in the market present. so that i can run my visual studio easily.

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  • Debugging Connection Issues Between Two Linux Servers

    - by clickfault
    I have two CentOS 5 servers running iptables and apf. I am having issues connecting with ssh from server 1 to server 2. I can connect from server 1 to a third server and from that third server to both 1 and 2. In all cases I am using the IP address and not a host name. I have stopped iptables and apf on all servers and it doesn't seem to change anything. What is the best way to debug this process?

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  • nginx: dump HTTP requests for debugging

    - by Alexander Gladysh
    Ubuntu 10.04.2 nginx 0.7.65 I see some weird HTTP requests coming to my nginx server. To better understand what is going on, I want to dump whole HTTP request data for such queries. (I.e. dump all request headers and body somewhere I can read them.) Can I do this with nginx? Alternatively, is there some HTTP server that allows me to do this out of the box, to which I can proxy these requests by the means of nginx? Update: Note that this box has a bunch of normal traffic, and I would like to avoid capturing all of it on low level (say, with tcpdump) and filtering it out later. I think it would be much easier to filter good traffic first in a rewrite rule (fortunately I can write one quite easily in this case), and then deal with bogus traffic only. And I do not want to channel bogus traffic to another box just to be able to capture it there with tcpdump. Update 2: To give a bit more details, bogus request have parameter named (say) foo in their GET query (the value of the parameter can differ). Good requests are guaranteed not to have this parameter ever. If I can filter by this in tcpdump or ngrep somehow — no problem, I'll use these.

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  • debugging connection to mysql from python script using MySQLdb

    - by timpone
    I am a python newbie and have a python 2.5 script that is using MySQLdb to connect on OS X 10.5.8. I haven't been able to succesfully connect to the database of interest with this. However, I am able to connect using php's mysqli and also via the mysql cli interface. I get the error: File "build/bdist.macosx-10.5-i386/egg/MySQLdb/connections.py", line 188, in __init__ _mysql_exceptions.OperationalError: (1045, "Access denied for user 'arc_development'@'localhost' (using password: YES)") On my linux box which has the same mysql perms, the script works fine logging in. On my OS X laptop, I am able to create a database named test_python which bypasses mysql authentication scheme. This makes me think that issues like 32bit / 64bit incompatabilities aren't occuring. If I turn on the query log, I get access denied: 100610 20:56:55 4 Connect Access denied for user 'arc_development'@'localhost' (using password: YES) I'm a little bit at a loss to what to do next. Is there any way I can specify in the general log or binary log to get the actual password set on the connection string? How about writing out from connections.py file the value (although not sure how I'd do that)? thanks

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  • Forward Hostname via my router to another PC for debugging

    - by Markive
    Hi, My web service runs on for example: http://mydomain.com/mywebservice.asmx. This works great, but I have a PDA application which I want to debug it synchronising through this web service. Currently the only way I can do this is to debug the webservice running on the actual server which is far from ideal. What I would like to do is for any device connecting on my wireless network, if it requests mywebservice.asmx for this to forward the request to my development PC and for IIS to then handle the request and allow me to debug in Visual Studio. So device on the network that requests the hostname: mywebservice.asmx will his this PC.. I am at a loss to set this up on my router (Zoom ADSL X6), this is massively out of my scope but any help would be much appreciated

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  • PC reboots spontaenously: debugging tips

    - by aaron
    I swapped my core 2 duo for a quad core recently, and generally things run fine, but every now and then my computer just restarts. I don't even get a blue screen (Vista 32). Core temp isn't a problem. My thinking is that my power supply is inadequate, but I haven't been able to test that (one idea was to under clock the cpu to see if that helped, but going up in speed was the only simple thing to do in the BIOS) Two cases where I semi-consistanly get problems: - Borderlands windowed after some period of time (and some other games, but Borderlands does it pretty regularly) - watching a video (e.g. quicktime/vlc) and having another video running Another thought is non-cpu heat? Maybe the graphics card? Any thoughts on how to track this down appreciated. Thanks!

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  • Debugging Internal Emails with Exchange 2003/2010

    - by user49995
    I am in the middle of migrating from Exchange 2003 to Exchange 2010 SP1. I have moved one mailbox over to the new server EXCHANGE2010 . For some reason if an internal email is sent from someone on EXCHANGE2003 (the old server), it is not delivered to the new mailbox on EXCHANGE2010. Where should I look to debug this problem? What logs should I consult? Update: I found the messages in Queues on the old server, listed as messages with an unreachable destination.

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  • Need Help Debugging BSOD

    - by nmuntz
    For the last few days I've been getting a BSOD at least once a day. Apparently the crash has been caused by ntkrpamp.exe and searching on google has revealed that the issue seems to be related to bad RAM. I have run memtest and my RAM modules have no errors on them. I'm pretty sure the issue is related to drivers, but I can't figure out which one. I'm not an expert in interpreting the output of windbg so any pointers would be greatly appreciated. Here is my analysis with WinDbg. It was too long to paste it here. One strange thing i noticed is that my Windows XP is in Spanish (SP3) and ntkrpamp.exe copyright info seems to be in portuguese. Not sure if that could be an issue, perhaps i have the wrong ntkrpamp.exe... Thanks a lot in advance

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  • Debugging info for authentication in tomcat

    - by Tom A
    I have a JDBC realm setup and a web-app using basic authentication, but I can't get it to work. It is putting up the password dialog but it never succeeds. If I could get the authentication process to spit out some logs, I would be fine. I have debug="99" in my realm specification but I see nothing getting logged in the usual places. Am I missing something?

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  • Debugging iFilter plug-in (PDF indexing)

    - by Trevor Sullivan
    I have the official Adobe x64 iFilter PDF plug-in and the FoxIt Software iFilter PDF plug-in installed, and neither one seems to be allowing me to index the contents of PDF files. So far, I've: Added my data folder into the Indexing service configuration Ensured that PDF files are configured to index "file properties and contents" Rebuilt the index from scratch But, when I search, I can only search for PDF file names, not the contents of them. Any ideas on how to debug this issue?

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  • Steps to debugging web site latency and timeout issues

    - by Paperjam
    I have a client who has multiple offices around the country, all of which share the same Internet connection via their WAN. One specific office for this client is experiencing severe latency and timeout issues with my web site. Most, but not all, of the latency occurs on a specific ASPX page where multiple postbacks are made while populating cascading dropdown lists (rapid form submits). The latency is sporadic and can be anywhere from a few seconds to a full timeout. There is no indication that the timeouts are occurring on the server's end. The IT guy for this client is having trouble narrowing down the problem. Since it is affecting only one location for one client, I am led to believe it is not something with my site but something specific to that location. He's measured ping times while using the site and has noticed no real variance in ping times even when the page has timed out. I believe this may be being caused by some sort of Internet filter that doesn't like rapid form submits, but beyond a hunch I haven't a clue. My question is what things should I tell the IT guy to look for? While I'm not trying to provide active tech support for this issue, I would at least like to glean an understanding of what is going on and try to offer some sort of advice. Thank you.

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  • Debugging COM+ applications

    - by cc0
    I have a number of separate COM+ applications that I have to figure out; The COM+ applications respond to a number of scheduled tasks, and I need to know which COM components within which applications are being used when I execute each of these tasks. It is easy to figure out what (if anything) goes wrong in the event log, but as I am working on testing each components compatibility with the others; I need to know which ones I have actually tested by executing the scheduled tasks. Does anyone have some useful tips here? I've been looking into the sysinternals tools, and specifically processmonitor, but I have not found a way to make it monitor the COM+ applications yet. (I initially started this question here, but realized it's probably more suited for serverfault)

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  • Synergy Locks up w7 when Visual Studio is debugging

    - by EdK
    I love synergy but as a developer this is driving me crazy. I use Synergy to go through two x64 Windows 7 machines (with all flavors of Visual studio from 2003 to 2010 professional) and an MacOS 10.6? desktop and most of the time it works flawlessly. However, if I happen to be in the middle of a transition from one windows 7 machine to the other (it's never happened to the mac but I don't flip to it that often) when Visual Studio hits a breakpoint, the mouse and keyboard both completely lock up and the only way I can seem to do anything is to physically unplug the mouse and keyboard and plug them back in. Unfortunately I have to crawl under my desk to do that, so you can see where it'd be annoying. Anybody have any idea how I can get around this? I did note that it was much more frequent with the previous version I had of synergy+ before I upgraded/sidegraded to the current version of synergy. But it's still happening. Thanks alot,

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  • Remote Debugging and deployment of a Project Built Locally

    - by Abhishek Gupta
    We work on our projects locally, and deploy them on remote servers for testing. This is currently done via git commits/push/pulls. But the problem here is that most of the commit contain errors and/or break the code in significant manner due to the lack of testing. Is there a way we can deploy the code on the remote server without using git commits, or some sort of temporary commits or patch or any other mechanism? And only commit, whenever it is important.

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  • Nagios escalation debugging

    - by Oesor
    I'm having some issues with escalations happening properly and I'm not sure if it's because of my config or because the nagios binary is nonstandard and something may be broken. I've got little experience with nagios, and just want to make sure this is being set appropriately. Should the following config file definition allow the escalations to take over and increment the notification interval as expected? Is there somewhere else in the config files I should be looking at to figure out what's going on? I've enabled debug 32 in the config and it's simply spitting out 'Host notification will NOT be escalated.' for each notification. The configuration does pass the pre flight check with no issues, and reports that it's parsing the three host escalations in the config. # test host definition define host { host_name test alias test address 10.0.0.10 hostgroups test check_interval 0 retry_interval 1 max_check_attempts 2 flap_detection_enabled 0 icon_image windows.png icon_image_alt LOGO - Windows vrml_image windows.png statusmap_image windows.png action_url /info/host/275 check_period 24x7 contact_groups hostgroup15_servicegroup1,hostgroup15_servicegroup10,hostgroup15_servicegroup13,hostgroup15_servicegroup14,hostgroup15_servicegroup2,hostgroup15_servicegroup3,hostgroup15_servicegroup4,hostgroup15_servicegroup42,hostgroup15_servicegroup45,hostgroup15_servicegroup46,hostgroup15_servicegroup47,hostgroup15_servicegroup5,hostgroup15_servicegroup8,hostgroup15_servicegroup9,ov_monitored_by_master check_command check_host_15!-H $HOSTADDRESS$ -t 3 -w 500.0,80% -c 1000.0,100% parents nagios notifications_enabled 1 notification_interval 3 notification_period 24x7 notification_options u,d,r use host-global } define hostescalation{ host_name test first_notification 3 last_notification 4 notification_interval 10 contact_groups hostgroup15_servicegroup1,hostgroup15_servicegroup10,hostgroup15_servicegroup13,hostgroup15_servicegroup14,hostgroup15_servicegroup2,hostgroup15_servicegroup3,hostgroup15_servicegroup4,hostgroup15_servicegroup42,hostgroup15_servicegroup45,hostgroup15_servicegroup46,hostgroup15_servicegroup47,hostgroup15_servicegroup5,hostgroup15_servicegroup8,hostgroup15_servicegroup9,ov_monitored_by_master } define hostescalation{ host_name test first_notification 4 last_notification 5 notification_interval 30 contact_groups hostgroup15_servicegroup1,hostgroup15_servicegroup10,hostgroup15_servicegroup13,hostgroup15_servicegroup14,hostgroup15_servicegroup2,hostgroup15_servicegroup3,hostgroup15_servicegroup4,hostgroup15_servicegroup42,hostgroup15_servicegroup45,hostgroup15_servicegroup46,hostgroup15_servicegroup47,hostgroup15_servicegroup5,hostgroup15_servicegroup8,hostgroup15_servicegroup9,ov_monitored_by_master } define hostescalation{ host_name test first_notification 5 last_notification 0 notification_interval 240 contact_groups hostgroup15_servicegroup1,hostgroup15_servicegroup10,hostgroup15_servicegroup13,hostgroup15_servicegroup14,hostgroup15_servicegroup2,hostgroup15_servicegroup3,hostgroup15_servicegroup4,hostgroup15_servicegroup42,hostgroup15_servicegroup45,hostgroup15_servicegroup46,hostgroup15_servicegroup47,hostgroup15_servicegroup5,hostgroup15_servicegroup8,hostgroup15_servicegroup9,ov_monitored_by_master }

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