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  • DNS lookup fails when with all the MAC workstations

    - by user39564
    Hi, I am having this insane problem. We are mac-heavy users. Around 10 workstations, one Xserve server, two windows workstation and one Linux (me). Last year I added an A record to our domain's DNS. However we had to change that a few months ago to a new IP. But all the Mac workstations fail to resolve the proper DNS and they still resolve to the old IP, even after 2 months. On both the windows workstation and my linux box a simple nslookup resolves to proper IP. However, on ALL the mac workstation, dig and nslookup report the old IP address. From my linux workstation: jp@lo:~$ nslookup - 208.67.222.222 client.xyz.com Server: 208.67.222.222 Address: 208.67.222.222#53 Non-authoritative answer: Name: client.xyz.com Address: 68.71.40.xx But when I am trying the exact same command from any Mac workstation, I get the old IP: $ nslookup - 208.67.222.222 client.xyz.com Server: 208.67.222.222 Address: 208.67.222.222#53 Non-authoritative answer: Name: client.xyz.com Address: 98.143.155.xx The strange thing is that this only happens in our internal network. No problem from home nor from another server. I did try to flush the DNS, don't worry. It did not help. I am starting to wonder if my router (OpenWRT) or Mac OS X Server is not in some way spoofing the DNS request and thus acting as a cache. Any suggestions/comments would be grateful. Thank you, JP

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  • Connecting a Wifi router to receivers with a cable instead of antenna?

    - by 31eee384
    This is a very strange question--I'd go so far as to say it's a stupid question. I'm being told that it is possible to, to describe it briefly, use a cable to connect an access point and a receiver directly to one another. This means that I would unscrew the access point's antenna, and attach one end of a cable to the port. Then, on the wireless receiver, I would also unscrew the antenna and plug in the other side of the cable. I'm being told the connection would work after this, just as a normal Wifi connection would. Bonus mini-question: if this works, would it still work if a splitter were attached to the access point and multiple receivers plugged in to the network? What would happen if I do this? Based on my surprisingly deficient knowledge of radio transmission, I don't think it would work. I would like some help knowing why it won't (or will) though, if possible. This is a somewhat hypothetical question--I realize that Ethernet does this exact job very handily, and I could just throw in a switch instead of the splitter. I simply feel that I should understand this scenario. Thanks for any help you can offer.

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  • MS Word custom dictionary making spellcheck slow - ideas?

    - by ezuk
    I have a user who edits technical materials. She uses MS Word's Custom Dictionary all the time for spelling; it has grown very large, and is now making spell check very slow. All of the advice I've read online says to disable the custom dictionary. This is an easy solution, but is not workable for the user, because she actually needs this dictionary. So, is there any way to optimize the custom dictionary and/or Word itself, so that a large dictionary file doesn't slow things down quite so badly? Many thanks. Update after suggestions: I ran contig on the file, and it reports just 1 frag, so that's not the issue I think. The file is 9.95KB -- 1,117 lines, each consisting of just a single word. I viewed the file using Notepad and none of the lines seems corrupted, strange, or overly long (no line seems to be over 10 chars or so). Both of your suggestions were helpful so I will upvote both; any further tips would be most welcome.

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  • VPS Memory Exchausted Even With Light Settings

    - by user101570
    Linux noob here. I have a 256MB VPS on Ubuntu 11.04 server and when I run "free -m" the result shows all memory being used (including the second line re: buffers/cache). I found this very strange, considering I only have 5 Apache processes running each chewing up about 20MB each. MYSQL is taking up 30MB. To my knowledge, and according to "top", I have no other memory hogs operating. Settings that may be relevant: PHP memory_limit = 32M MYSQL key_buffer = 16M Prefork MPM Maxclients = 10 So when I reviewed these settings, I naturally thought maxclients was too high, so I tried switching it to 5. Now not only does my memory still show as being 100% used, my website loads much, much slower, despite not getting any traffic aside from mine at the moment. I don't understand this. I thought a single Apache process handles all requests from a client received within the "KeepAliveTimeout" window, which I've set to 2 seconds. With my initial config. of 10 maxclients, my page load times are around .3ms, so a single process should handle that no problem, correct? So next I went to an extreme level of 1 for maxclients. My memory is still at 100% usage and my site loads painfully slow. I'm a noob at a complete loss here. According to the many tutorials I've read on basic server setup, I should be good to go. Help! Please! Edit: total used free shared buffers cached Mem: 256 256 0 0 0 0 -/+ buffers/cache: 256 0 Swap: 0 0 0

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  • Windows 7 - SBS - Why does copying a directory not include all subdirectories and files?

    - by indeed005
    Using Windows 7, fully updated... I have had some strange behaviour copying a whole user directory (e.g. "c:\users\bob" to "c:\backups\bob") I understand now that I should have used Easy Transfer or at least robocopy, but at the time all I wanted to do was backup the user's data before using the "Delete account" button. Unfortunately, I didn't check that my copy-paste had actually worked; all it had actually done was copied the appdata subdirectory of the user account. At the time of doing this backup I was logged in as the same user, bob (a local admin) in this example. When I discovered the missing files, I tried again using the domain admin account -- same story. Only appdata copied. No documents folders, nothing else. Then my boss tried, and it worked fine -- it copied all the files. Ctrl+C, Ctrl+V. I tried again... same profile... copied all the files. Same profile, same destination, same rights and permissions, same ownership, but different behaviour. Has anyone encountered this before and come up with a solution? BTW this was not using roaming profiles and the accounts are stored locally.

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  • mouse pointer moving on its own

    - by PA
    After two months of working correctly, I am experiencing an strange and very annoying problem. My mouse pointer is moving on its own. If I move the mouse to the left, as soon as I stop the movement, the pointer runs again to the far right. This makes the mouse totally unusable. The mouse device is an optical USB mouse. It is not a problem with the mouse itself. I have tried with another mouse, same problem. (both mice are OK, I have tried both mice on my laptop, both worked perfectly) Have tried different surfaces, too. Same problem. System is Windows XP Pro SP3. Computer is a desktop PC two months old. I suspected it could be a problem with the mouse driver. But both mice are from different brand, so I suppose they use different drivers. What else can I try? any suggestion?

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  • Are these three brand new sticks of RAM really dead?

    - by David Brown
    I'm working on a Dell Dimension 4700 desktop for a friend. It came with 512MB of DDR2 RAM (two sticks of 256MB). One morning, it started blue screening on startup with no helpful error messages. It refused to boot into any form of Windows installation, including Safe Mode, original recovery disk, and my custom Windows PE disk. It did boot into the Ultimate Boot CD, so I ran memtest86, which reported errors everywhere. I removed one stick of RAM and the system booted up just fine. I moved the remaining stick into each slot and the system continued to operate normally, so I came to the conclusion that the stick that I removed was dead. I ordered an exact replacement, along with 2 more sticks of 256MB DDR2 (again, exactly the same as the original), bringing the total system memory to 1GB. Upon installing the three brand new sticks, the system blue screened again, this time stating that win32k.sys attempted to write to read-only memory. I inserted my custom Windows PE disk in order to get a better look at the memory dump with BlueScreenView, but it refused to boot and produced another blue screen, but without an error message. I removed each new stick one-by-one, restarting each time. It continued to blue screen until I was left with only the original stick. I then tried inserting the new sticks in various different orders, but this only produced more blue screens. I reinserted all three sticks (along with the original) and ran memtest86 again, which reported errors all over the place. So, now I'm right back where I started. I don't think it could be the slots themselves, because I can plug the original stick into any slot and it works just fine. System setup reports each stick correctly and shows the total as 1GB, however. It just seems strange to me that all three brand new sticks of RAM could be dead on arrival. Is there something I missed? Or should I just go ahead and RMA them?

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  • External-Harddisk drive couldn't run unless in safe mode

    - by zfm
    This is the strangest thing ever happened to me... I have an external harddisk drive (ext-HDD), bought around 2 years ago (don't know whether this is an important issue or not). Here, I have a video file (.avi) in my internal harddisk dive (HDD), it worked very well, then I copy it to my ext-HDD, but I couldn't run the file directly from my ext-HDD! I tried to copy it back to my HDD (from the ext-HDD), and now the copy couldn't be run on my HDD too. Remember that I copy the file, so the original one was still there. I tried to go to safe mode (forget to mention, I use Windows 7 Pro), and this is where the strange thing happened, the copied files (both in ext-HDD and HDD) can be run in this safe mode. So, my question is, what could actually be happened there? PS: My ext-HDD is Axioo, 250 GB, exFAT... Edited: Currently I used MacOSX, and the file in the harddisk still can't be run. I haven't tried safe mode for Mac (is there one?), but will try later (if there is)

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  • MySQL fault linked to windows shutdown failure?

    - by Roy
    As far as i understand my computer is experiencing a strange coincidence (hopefully it isn't and somebody can enlighten me). Basically i shut down my laptop (Windows 7) (at 17.20, today, to be precise) successfully (and so also did XAMPP and its included components). However upon starting my laptop up again in the last hour i noticed that the MySQL module service in my xampp control panel was not coming on (just a big red tick; incidentally everything else was working fine). Now, i had the exact same problem about two weeks ago, whereby i just reinstalled xampp and got it working again. But rather than doing this straight away i thought i would just restart my laptop first. However it won't restart (or shut down first) to be precise now. I can remember Windows wasn't shutting down properly the last time it happened (about two weeks ago). Just wondered if this coincidence pointed to any specific diagnostic as regards the problem with MYSQL? If so i would appreciate greatly any help. Otherwise sorry for wasting your time.

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  • USB-to-Serial showing gibberish at 115200 Baud

    - by Mose
    I've got a serious problem which drives me crazy because I tried everything I could think of. First of all, I made a video: http://youtu.be/boghkuq7L_s but please read the following text for more information, not only view the video! When using a USB-to-Serial interface everything works as long as I don't go beyond 57600 Baud. At higher rates I only get giberish like this: év.­b0JNLYÆÿ¿iëd0U²(kßÞb! ú]/xscB!ï¯!BoXûÿ1ïâÖCÿ6ÌAnè*íÌC)º¿BíÞØ.C.@ÆÃwHJÂs "YE:ñ.èFðÌCÊ÷ÞÄ !x H w6@BtbHJ ̪ Ì6ì H¾a¿bH.">îvy®;f<ßBÌ p­L¨fæH­E ­þ¼MBÞI What makes the problem so strange is, I exchanged every component and the problem still presists. I tried differtent OSes (Ubuntu, WinXP, Win7, OSX 10.7) with 32 and 64 Bit. I tried USB-to-Serial interface from FTDI and Prolific. I tried reading the output from my Raspberry PI and from an Asterisk Appliance. I changed the cables and the wiring. Nothing helped. In the video I made a example with a old Notebook with native COM and put the USB-to-Serial to the same connection as "sniffer" (only Rx and GND connected) to make sure the output and everything is ok as one can see on the native port. The voltage is ok. Settings for both are 115200 Baud, 8 Bit with 1 Stop and no flow control. Native is ok. USB is messed up. I used the newest drivers and double checked all connections. I have no idea what is wrong here. As I couldn't find anyone describing problems like this I question my long experiance in computer science and think I'm doing some completly wrong... Please help :-/

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  • Can't remote into Virtual PC

    - by Spamela
    I used to be able to remote into my Virtual PCs. It has been working for at least a year. Yesterday just stopped working... I cannot figure it out... Things I have triple-checked: 1. My Virtual PCs have "Allow Remote Access" checked. 2. My Virtual PCs have an account in the Administrator group that is password protected. 3. My Host's entry in the registry for the Terminal Services Port is still the default of 3389. So here is the strange thing. I can't even remote into the Virtual PC from it's host much less another PC... From the host, I can ping the Virtual PC and get a response but when trying to remote into it from the host I get the following error: Remote Desktop can't connect to the remote computer for one of these reasons: 1)Remote access to the server is not enabled. 2)The remote computer is turned off 3)The remote computer is not available on the network My host is running Windows 7. Virtual PCs are running XP. Thank you for looking at this!

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  • PHP-FPM processes holding onto MongoDB connection states

    - by Brendan
    For the relevant part of our server stack, we're running: NGINX 1.2.3 PHP-FPM 5.3.10 with PECL mongo 1.2.12 MongoDB 2.0.7 CentOS 6.2 We're getting some strange, but predictable behavior when the MongoDB server goes away (crashes, gets killed, etc). Even with a try/catch block around the connection code, i.e: try { $mdb = new Mongo('mongodb://localhost:27017'); } catch (MongoConnectionException $e) { die( $e->getMessage() ); } $db = $mdb->selectDB('collection_name'); Depending on which PHP-FPM workers have connected to mongo already, the connection state is cached, causing further exceptions to go unhandled, because the $mdb connection handler can't be used. The troubling thing is that the try does not consistently fail for a considerable amount of time, up to 15 minutes later, when -- I assume -- the php-fpm processes die/respawn. Essentially, the behavior is that when you hit a worker that hasn't connected to mongo yet, you get the die message above, and when you connect to a worker that has, you get an unhandled exception from $mdb->selectDB('collection_name'); because catch does not run. When PHP is a single process, i.e. via Apache with mod_php, this behavior does not occur. Just for posterity, going back to Apache/mod_php is not an option for us at this time. Is there a way to fix this behavior? I don't want the connection state to be inconsistent between different php-fpm processes.

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  • What can be done to improve time synchronization on networks with sporadic internet access?

    - by anregen
    I'm looking for advice setting up time servers for a very non-typical network. I support many closed networks that have occasional access to the internet. A network would get access most days for a few hours, but would frequently go 1-3 weeks blacked-out. The computers/servers on this network are mostly *nix-based, but not all the same flavor. The entire network is mobile, so when it connects, it will have very different hops/latency to internet time servers. The servers on the closed network are powered-off frequently (at least daily). Right now, my gut tells me to use NTP (because I hate re-learning all the stuff that someone else already got working pretty well). But I have several issues, and am looking for someone with experience in this type of strange situation. I currently have no solution in place, I'm simply letting the internal clocks drift. This results in errors of ~600s in a majority of networks. I have seen mismatch worse than 10,000s. Is there something "better" than NTP in this situation? I know NTP likes to have very frequent, consistent access to servers that give nearly identical answers. I won't have that. How many internal NTP servers should I configure, so that during periods of internet blackout, I have internal time that is consistent within the closed network? There is no human access. No matter how large the mismatch, the server(s) must attempt to correct itself. Discrete steps are very bad. No matter how large the mismatch, the correction must be "slewed", not "stepped". I understand that this could take many hours to correct.

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  • SNMP query - operation not permitted

    - by jperovic
    I am working on API that reads a lot of data via SNMP (routes, interfaces, QoS policies, etc...). Lately, I have experienced a random error stating: Operation not permitted Now, I use SNMP4J as core library and cannot really pinpoint the source of error. Some Stackoverflow questions have suggested OS being unable to open sufficient number of file handles but increasing that parameter did not help much. The strange thing is that error occurs only when iptables is up and running. Could it be that firewall is blocking some traffic? I have tried writing JUnit test that mimicked application's logic but no errors were fired... Any help would be appreciated! Thanks! IPTABLES *nat :PREROUTING ACCEPT [2:96] :POSTROUTING ACCEPT [68:4218] :OUTPUT ACCEPT [68:4218] # route redirect za SNMP Trap i syslog -A PREROUTING -i eth0 -p udp -m udp --dport 514 -j REDIRECT --to-ports 33514 -A PREROUTING -i eth0 -p udp -m udp --dport 162 -j REDIRECT --to-ports 33162 COMMIT *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT ..... # SNMP -A INPUT -p udp -m state --state NEW -m udp --dport 161 -j ACCEPT # SNMP trap -A INPUT -p udp -m state --state NEW -m udp --dport 162 -j ACCEPT -A INPUT -p udp -m state --state NEW -m udp --dport 33162 -j ACCEPT ..... -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT

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  • Apps won't start after vanilla reboot

    - by Daniel R Hicks
    I had Adobe and Norton nagging me to reboot, so I did that -- clicked Reboot from the Start button. Everything seemed pretty normal as it shut down and came back up, but once up a bunch of apps won't start. The first one I noticed was Firefox. It would flash the disk light normally, but never appear on the screen. Then I tried to bring up an OpenOffice Calc window and same thing. I tried to bring up MS Word, and the splash screen appeared, but never the main screen, and the splash screen just sat there, with a swirly over it. But I tried Solitaire, Notepad++, Paint, and several others, and they popped up just fine. And I'm typing this from IE 8, which, if anything, came up faster than usual. When I try to open up "Network and Sharing Center" the window appears, but nothing appears in it, and eventually it's tagged "not responding". When I kill that window I get (after a delay) "Windows Explorer is not responding", and when I say "OK" the screen resets. I tried rebooting again, and no joy -- same as before. Have done nothing particularly strange on this box, and it's not generally at significant risk for malware. I haven't installed anything new other than the afore-mentioned updates. One other thing: Several minutes after rebooting I get the message "Error: Unable to start Bluetooth Stack Service." The Bluetooth radio is turned on, and I rarely have anything Bluetooth attached, and I don't recall that I've ever seen this message before. Added: Looking at Event Viewer, I'm getting a lot of "The description for Event ID 1 from source xxx cannot be found." Is there any significance to this? Added: I'm looking at restoring from backup, but the procedure is, at best, unclear. Is it sufficient to restore from "Backup and Restore Center", or must I restore from the restore DVD first?

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  • No partition on USB Flash Drive?

    - by Skytunnel
    A friend gave me a corrupted USB memory stick to try recovery data from. But I've had some unusual results, so thought I'd share to see if anyone is familiar with this problem... First off I just tried opening from my own PC. Windows prompted to Format the drive, which I of course declined Downloaded TestDisk to anaylsis the drive. And right away I noticed something strange, on the listed drives it comes up as Disk /dev/sdc - 6144 B - USB Flash Drive That's right, the first USB flash drive smaller than a floppy disk!? Moving on anyway... first anaylsis comes up with: Partition sector doesn't have the endmark 0xAA55 TestDisk's Quick Search gave no results, moved on to Deeper Search: No partition found or selected for recovery This left me stumped. I tired a couple of other programs with no success I did manage to get a backup image, but it was just as small as TestDisk indicated, so nothing of use on it After a few hours trying various suggestions from other sources, I gave in and just tried formatting the drive. But returned the message: Windows was unable to complete the format. From googling that, the suggestion was to delete the partition. But there is no partition to delete in this case. most recently I've tried formatting from cmd, and got this result: Format D: /FS:FAT32 The type of the file system is RAW The new file system is FAT32 Verifying 0M 11 bad sectors were encountered during the format. These sectors cannot be guaranteed to have been cleaned The volume is too small for FAT32 Anyone got any suggestions? UPDATE: As per suggestion from @Karen, I tried running a CLEAN from DISKPART, results as follows DiskPart has encountered an error: The request could not be preformed because of an I/O device error.

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  • is there a man in the middle attacking to my server machine?

    - by GongT
    My server works well about half a year. But a strange thing happened (several hours before). This server has two IP-address 58.17.85.19 & 117.21.178.19 When I navigate to http://58.17.85.19, nothing different as before. But http://117.21.178.19 will return a "302 Object moved" and become a "redirect loop" I do some test: ($cmd = "wget http://117.21.178.19/?xx=$RANDOM --max-redirect 0 -S --no-cache -O -") Step by step: run $cmd on my PC and my firend's one (we live in two side of China, far away). - got 302 run $cmd on this server - got 200 OK (content is correct result of index.php) run $cmd on another server in same computer room - got 200 OK telnet from my PC and build an HTTP request (type by hand) - got 200 OK shutdown php-fpm, run $cmd on my PC - got 302 run $cmd on server - 502 Bad Gateway shutdown nginx, run $cmd on both the server and my PC - Connection refused. create iptables rule, refuse any connection to 58.17.85.19:80. run nc -l 80 -k -vvv on server and run $cmd on my PC NC show me that.... Server accept connection (Connection from [my ip]) My connection closed ! (Remove fd xx from list) wget dump out response - got 302 I know that, normaly, NC will accept connection, then dump HTTP request from client, and client will wait for response. this connection will open forever(infact client will close connection becouse timeout), becouse NC can't give any response. So... where my request gone? who send an response to the client? some virus on my server system? If so, why 58.17.85.19 didn't has this error? or... I was attacked by a middleman?

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  • Weird Outlook Behavior; Creating its own file folder

    - by Carol Caref
    Outlook is doing a very strange thing. It has created a folder on its own (which, whenever I completely delete, comes back, with a different name). Mail that goes into this folder will not go to any other folder unless I forward it. If I move the email or create a rule to always move mail from particular senders to the Inbox, it moves for a while, but then goes back into the created folder. The first one was called "junk" but it was in addition to my normal junk email folder. When I forwarded all the messages (some were junk, but most were not) and totally deleted that folder, a new one, called "unwanted" appeared that acted the same way. It seems that once one email goes into this folder, then any email from that person also goes into the folder. I have discussed this with the tech person at work. There is no evidence of virus or any other identifiable reason for this to happen. We have searched the Internet and not found anything like this either.

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  • mod_rewrite changes case even if not matching RewriteCond?

    - by kirdie
    I have a really strange problem with my MediaWiki which I want to have articles of the form mywiki.org/MyArticle. Now I got most of it to work using the following code but it mysteriously cannot display the logo anymore. RewriteEngine On # don't rewrite valid requests to files and directories RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-f RewriteCond %{DOCUMENT_ROOT}%{REQUEST_URI} !-d # mywiki.org/MyArticle gets rewritten to mywiki.org/index.php/MyArticle RewriteRule ^/(.*)$ /index.php/$1 [L,QSA] Now when I type in mywiki.org/img/logo.jpg in my browser the adress changes to http://wiki.geoknow.eu/Img/logo.jpg (capital I) and I get to the empty article page but the image is definitely there (in my document root under the img folder): /var/www/mywiki.org$ ls img logo.jpg So far so bad. But now it gets really crazy: When I add RewriteCond %{REQUEST_URI} !^/.*\.jpg my adress still gets rewritten and my access log says - - [05/Dec/2012:16:30:21 +0100] "GET /Img/geoknow_logo.jpg HTTP/1.1" 404 509 "-" "Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Firefox/17.0" Where does that capital I in Img come from? The rule is not even executed because at least one condition is definitely not met now and I also don't have any to lowercase-transformation defined anywhere. What is happening there and how can I repair this? P.S.: Now all of the sudden the problem went away (the image is displayed as it should and there is no capital replacement anymore. What can cause this and why does it spontanously appear and disappear?

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  • XP - ping changes routing table?

    - by Corelgott
    Hey Folks, I have got a real strange behaviour with one of my XP-Sp3 machines. Setup: A Server in the lan (192.168.5.0) proviedes access to all roadwarriors in 10.8.0.0 The DCHP has a static route for all clients pronouncing 192.168.5.235 as gateway for 10.8.0.0 All Clients can ping & access the vpn-machines; everything works like a charm But one Xp-Sp3 is not willing to connect to them. It gets all the same routes as any other sytem in the lan and I trippel-checked - there are no static routes on this machine When I ping any 10.8.0.0 device from this machine, the first two packaged work like a charm; but the next two (and any package after them) fail and get lost. When I look back into the routing table: There is a new route; a special one just for the device I pinged, which points to the right gateway - but which wasn't there earlier... As Long as this route exists the machine can't ping anything on 10.8.0.0. But if I remove the route by hand: The next to ping packages work fine... Has anybody got an idea about that? Anybody every seen such a behaviour? Any hint / help / tip is greatly appreachiated! thx in advance Corelgott Ps: I attach an image of the cmd to clarify things - its in german, but reading a routing table shouldn't be that hard...

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  • "Server not found" errors all over after Wordpress installation

    - by picardo
    I uploaded my Wordpress blog from my local machine to Slicehost and then pointed the domain name to the IP address. Then I installed the blog as normal. Once I went to wp-login.php to login, though, I started getting "Server not found" errors. That was strange because the server process was still running, and I checked many times. I can't see anything wrong in the error log, or the access log either. This doesn't only affect Wordpress. I can't access phpmyadmin either now, which was mapped to a subdirectory of the same domain address. What is going on? Can anyone help? Edit: the blog is located on a subdomain. It's still accessible from IP address. The virtual host configs are ServerName and ServerAlias, both set to blog.mysite.com. When I changed those and restarted apache, phpmyadmin came back. Edit: also it's not a propagation issue because I installed the blog from the domain name. It's only when I tried to log into the admin section, I started getting these errors.

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  • SSH attcack CentOS Amazon EC2

    - by user37143
    Hi, I run a few Rightscale CentOS AMI based instances on Amazon EC2. Two months back I found that our SSHD security is compromised( I had added host.allow and host.deny for ssh). So I created new instances and done an IP based ssh that allows only our IPs through AWS Firewall(ec2-authorize) and chnaged the ssh 22 default port to some other port but two days back I found I was not able to login to the server and when I tried on 22 port the ssh got connected and I found that sshd_conf was changed and when I tried to edit sshd_config I found root had no write permission on the file. So I tried a chmod and it said access denied for 'root' user. This is very strange. I checked secure log and history and found nothing informative. I have PHP, Ruby On Rails, Java, Wordpress apps running on these server. This time I did a chkrootkit scan and found nothing. I renamed the /etc/ssh folder and reinstalled openssh through yum. I had faced this on 3 instances on CentOS(5.2, 5.4) I have instances on Debian as well those working fine. Is this a CentOS/Rightscale issue. Guys, what security measures I should take to prevent this. Please support me this is very critical. Thanks

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  • CentOS server. What does it mean when the total used RAM does not equal the sum of RES?

    - by Michael Green
    I'm having a problem with a virtual hosted server running CentOS. In the past month a process (java based) that had been running fine started having problems getting memory when the JVM was started. One strange thing I've noticed is that when I start the process, the PID says it is using 470mb of RAM while the 'used' memory immediately drops by over a 1GB. If I run 'top', the total RES used across all processes falls short of the 'used' listed at the top by almost 700mb. The support person says this means I have a memory leak with my process. I don't know what to believe because I would expect a memory leak to simply waste the memory the process is allocated not to consume additional memory that doesn't show up using 'top'. I'm a developer and not a server guy so I'm appealing to the experts. To me, if the total RES memory doesn't add up to the total 'used' it indicates that something is wrong with my virtual server set-up. Would you also suspect a memory leaking java process in this case? If I use free before: total used free shared buffers cached Mem: 2097152 149264 1947888 0 0 0 -/+ buffers/cache: 149264 1947888 Swap: 0 0 0 free after: total used free shared buffers cached Mem: 2097152 1094116 1003036 0 0 0 -/+ buffers/cache: 1094116 1003036 Swap: 0 0 0 So it looks as though the process is using (or causing to be used) nearly 1GB of RAM. Since the process (based on top is only using 452mb, does that mean that the kernal is all of a sudden using an additional 500mb?

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  • Input/output error reading USB backup drive on CentOS 6.4

    - by Kev
    I'm suddenly seeing some strange behaviour on our USB backup drive that doesn't make sense to me: (2013-10-21 14:58:23 [root@newdc /]$ cd /mnt/backup/ (2013-10-21 14:59:03 [root@newdc backup]$ ls -la ls: reading directory .: Input/output error total 0 (2013-10-21 14:59:05 [root@newdc backup]$ df -h /mnt/backup Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 843G 28G 97% /mnt/backup How is it possible for the OS to know how much is in use, but I can't ls any of it as root? Or more to the point, what problem does this indicate? /var/log/messages said this: Oct 21 14:57:54 g5 kernel: EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal Oct 21 14:57:54 g5 kernel: EXT4-fs (sda1): Remounting filesystem read-only But...read-only is something different than 'throw an io error'... After unmounting to try fsck on it, I had someone on-site look at it, and the drive was not spun up, and had a slow-flashing light, which I believe means it was in a power-suspend mode. So I had them unplug and replug the USB cable, and now (before remounting) it says: fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) /dev/sda1: clean, 2805106/61046784 files, 181934167/244182016 blocks I then mount it and now ls works and df reports: Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 680G 191G 79% /mnt/backup What would cause it to go into such a state without being asked to? Why all the weird behaviour, and now it appears to not be corrupt?

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  • Win 7 Remote Desktop connection failure when already logged in.

    - by Andy E
    I have a bit of a strange problem, magnified recently by my broadband dropouts. I wasn't sure whether to post this on SU or SF, so I thought I'd start here as more users would be likely to know what the problem is. In short, when I try and connect to my server (Windows Server 2008) from my laptop running Windows 7, I can only connect if my remote account was previously logged out. If I'm still logged in I get the error message: Windows cannot connect to the remote server. No explanation or anything. If my IP address is the same, I don't have this problem. If I boot up Windows XP Mode and run XP's remote desktop connection it works just fine -- I think the difference there is it takes me to the remote server's logon screen. With Win 7 RDC you never see the logon screen, it asks you for credentials before entering full screen mode. The real problem is that I'm having random broadband dropouts and my IP isn't static. If I logon via Win XP RDC, log out and then run Win 7 RDC then it works fine. I realize I can just use Win XP's RDC for now, but I don't really like keeping XP Mode open if I can help it. Does anyone know a way around this problem? Maybe forcing Win 7 RDC to go to the logon screen, or changing some server-side settings to work around the IP address issue?

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