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• OS X Leopard (10.5) Server -- Unwanted Emails

  - by David

  Our OS X Leopard (10.5) server is sending out an email EVERY DAY for a Disk Full Notification on an external HDD we use for Time Machine backups (which manages it's own disk space, so the disk full notifications are useless). In the Server Admin app, under Settings Notifications, there's this: which is clearly disabled. The email header and message: http://pastebin.com/V5PZ3Phk I've been told to check the mail.log, but it's mostly empty (except for a few logs in 2011 saying "Postfix mail system is not running". I've also been told to check the crontabs, but I'm not sure how to do that on OS X (or any OS for that matter). Can someone explain how to do this? Also, if there's any other suggestions on places/things/etc to look at/for, my ears are all open!

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• How iptables behaves on timezone change?

  - by pradipta

  I have doubt how iptables keep changing the info in iptables when timezone is change. I am using iptables s v 1.4.8 I have blocked one IP with following details # date Thu Jun 6 12:46:42 IST 2013 #iptables -A INPUT -s 10.0.3.128 -m time --datestart 2013-6-6T12:0:00 --datestop 2013-6-6T13:0:00 -j DROP # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 12:00:00 until date 2013-06-06 13:00:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination But after I change the timezone following things happened automatically . AFTER TIME ZONE CHANGE +++++++++++++++++++++++ #date Thu Jun 6 15:17:48 HKT 2013 # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 14:30:00 until date 2013-06-06 15:30:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # The time value is changed in the rule . It is changing with the timezone how. Where iptables keeps track of timezone. Kindly explain me.

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• Why would one server be sending DUP ACK packets to one PC, which is responding with HTTP RST packets?

  - by IronicMuffin

  I'm not a network profressional, so please excuse any wrong language. I was debugging why my DNS traffic was a constant 160Kbps on our corporate network. I opened up a wireshark trace, and I see one PC of a coworker broadcasting HTTP [RST] packets to one of our DMZ servers at the rate of 1000 a second. He restarted his machine, and as soon as it went offline, the server started broadcasting [DUP] [ACK] packets, until he came back online. It then resumed the HTTP [RST] packets. Apparently this server has been doing this kind of behavior since it went live. I believe it did this with a printer and an access point as well. Can anyone explain why this behavior is occurring? Any solutions? The initial research was done because there have been "bandwidth issues" and I wonder if this is contributing.

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• Where does Skype save its chat history & contacts?

  - by user4796

  I'm aware that there is a main.db file that is stored in a Windows directory. On XP: C:\Documents and Settings\<windows user>\Application Data\Skype\<username> But I just downloaded Skype onto my Android and noticed that all chats are sync'd. So to me, this suggests that the main.db file is not the only storage being used (because it is obviously not on my phone). Are contacts and chat history stored in my online Skype account? Does anyone know where I can find more information about this? I read this thread: Does skype automatically save chat history to the cloud? And how do you explain the sync'd chats?

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• Vmware peaks NFS load every 30 seconds

  - by gtirloni

  We were troubleshooting a performance problem on one of our storage servers and after investigating almost everything in sight we saw that every 30 seconds, Vmware would go from 10k IOPS (NFS) to 30k, 50k, 100k or whatever the server would handle. Most of it were reads. What could cause this raise in NFS operations per second every 30 seconds? The virtual machines are managed by external customers and there isn't much in common between them. While breaking utilization down by filename, we discovered 5-10 virtual machines that contributed more to those peaks but it still doesn't explain why every 30 seconds. There are no other peaks outside that 30 sec period (ie. it stays in an almost constant average). Is there an NFS tweak in Vmware to change that 30 second period? If that's really necessary, we would like to introduce some variation so all that workload isn't dropped all at once. It's causing NFS timeout on the ESX 3.5/4.0 hosts when the storage gets overloaded.

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• Checking that tasks are executed

  - by homer5439

  I'm not sure how to explain this. Once one starts having dozens or hundres of servers, each running some sort of periodic jobs (mostly from cron), there is a problem of making sure (or as sure as possible) that these tasks are actually ran. I mean, I get an email if a job fails fails, and no mail if it succeeds, but also no mail if it doesn't run for whatever reason. Sure, I could change them and have them send a "successfully ran" email, only to be flooded by mails that most of the time I don't want to see. Basically, I want to be notified only if: a task ran and failed a task didn't run at the expected time. Is there a way to do this?

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• Why does the heat production increase as the clockrate of a CPU increases?

  - by Nils

  This is probably a bit off-topic, but the whole multi-core debate got me thinking. It's much easier to produce two cores (in one package) then speeding up one core by a factor of two. Why exactly is this? I googled a bit, but found mostly very imprecise answers from over clocking boards which do not explain the underlying Physics. The voltage seems to have the most impact (quadratic), but do I need to run a CPU at higher voltage if I want a faster clock rate? Also I like to know why exactly (and how much) heat a semiconductor circuit produces when it runs at a certain clock speed.

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• sticky bit on NFS file system

  - by Kris_R

  I have a system where to the main server (homes, nfs, ntp, queue...) can log-in only root – all the other users use front-end host with NFS-mounted home directories (RW) and all other software directories (read-only). My problem is, that time to time, if root or normal user with sudo makes some administrative works on front-end some homes of normal users getting sticky bits (drwsr-sr-x). If it happens usually the user can't log-in (as long as permission for his home are not changed to drwxr-xr-x). The last time I saw it after compiling some new software (normal user configure;make) and installation from the same directory as root (su and make install or direct as normal user sudo make install). Can somebody explain me why it happens and what should I do to get rid of this problem? p.s. I'm using CentOS 5.7

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• Can't delete file from windows 7

  - by r.s.mahanti

  I downloaded a torrent file from internet. The problem is it's size is showing 0 bytes. I tried to scan it with antivirus, upload it to virus total, delete it but it's showing the file is not found. I tried to delete it in safe mode also but no success. Can anybody explain me, what can be reason for this and what is the way to delete this file? Thanks in advance. My operating system is windows 7. EDIT : the name of the file is "[Torrentreactor.to] - Site Translator 4.06.torrent."

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• What is a good "free-form" ("type anywhere" or canvas-like) text editor? [on hold]

  - by scorpiodawg

  My 5-1/2 y.o. son is starting to use a computer and one of the things he likes to do is to type stuff into an editor. He has used TuxPaint before and is familiar with the idea of a "canvas" for painting stuff (where painting anything anywhere on the canvas is fair game). When he opened the text editor (this was gedit on Qimo Linux), he attempted to do the same thing -- he pointed the text cursor to an arbitrary location within the editor window and expected to be able to type there (like a "text canvas", if you will). I had to explain to him that he would have to press Enter a few times to create new lines, as well as press Space a few times to create columns before he could do that. This is sub-optimal. My question: are there any free-form, canvas-like text editors that I can have him use? Almost like hex editors of yore. I am not interested in getting him to create "text areas" in a paint program.

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• Access denied for user who has full access to some files in their own folder

  - by steve02a

  I have a very similar case as this user: Access denied on some files on Win2008R2 DC share This is on a windows 2008 R2. The user has Win7 pro. The user has their own home folder on the server. Every file, except one, the user can read/write/modify at their own will. No problems - except this one file. She gets "access denied" I can open it (as domain admin). Another user can open it (because she's in the domain admin group). I did run the AccessEnum tool and the read/write permissions are all identical for all files. So, I can't explain why the user can't open this one single file. Out of all her files in sub-folders and such. No problems. This one file is causing a headache. What do you think could be wrong here?

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• Hyper-V R2: Need help with disk structure

  - by MojoDK

  Hi all, I'm going to use the free (non gui) version of Hyper-V R2. In my new server I have 8 disks in total (for Hyper-V R2 installation and virtual machine). Atm I'm going to run a single virtual machine, with following tasks: Windows Server 2008 R2 x64 File/Print SQL Server My question is ... with my 8 disks in the server, which disks should contain wich data? Should I install "Hyper-V R2" and VM's drive c on same physical disks? Should I use raid 1 or 5? With the above tasks, how would you structure the disks? Hope you know what I mean (I'm not english, so it's difficult to explain). Thanks!!! Mojo

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• missing windows/system32/config/system

  - by Faruq Sandi

  i know it is common problem, but not its so strange. problem: common missing windows/system32/config/system what i do next: put hdd to another pc and boot from it, it is succeeded but without warning window after startup that says like "windows has recovered from serious problem". and than i put back hdd to previous pc. tadaaa!!!! missing windows/system32/config/system is happening again! now i am trying repair this problem with recovery console from CD. i hope it will successful. someone can explain this? what should i do?

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• How do I get a static IP address for my teapot?

  - by Joe

  I maintain this teapot: It returns a 418 error when it is pinged, and it is pinged regularly by people arriving from the relevant Wikipedia page. (For those interested, and there appear to be a few of you, the relevent story is here) It sits on a shelf in my office in the Computer Science department of a university and the support guys were kind enough to give it a dedicated IP address some years ago. My contract is coming to an end in the next few weeks and it's occurred to me that I'm going to have to do something with the teapot. I'd like to take it home but I have no clue how to explain to my home broadband supplier that I want a dedicated IP address coming to my house so that people can ping a teapot. Is there a reasonable way of having a server on a shelf in my house that people can ping via an IP address? What search terms can I use to find a solution to this problem?

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• How do I create yum repo file?

  - by max

  I know there is a previously asked question, but I still have some doubts so asking again. How do I create a yum repo file? I know that in the /etc/yum.repos.d/ I have to create .repo file. Below is the pattern: 1 [name ] 2 name= 3 baseurl= 4 enabled=1 5 gpgcheck=1 6 gpgkey= Here in the baseurl which link should I give? I'm fully confused about this. How do I get that baseurl link? Can anyone please explain to me clearly? I am using CentOS 6.2.

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• Linux/Solaris replace hostnames in files according to hostname rule

  - by yael

  According to the following Perl command ( this command part of ksh script ) I can replaced old hostnames with new hostnames in Linux or Solaris previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a export previos_machine_name export new_machine_name . perl -i -pe 'next if /^ *#/; s/(\b|[[:^alnum:]])$ENV{previos_machine_name}(\b|[[:^alnum:]])/$1$ENV{new_machine_name}$2/g' file EXPLAIN: according to perl command - we not replaces hostnames on the follwoing case: RULE: [NUMBERS]||[letter]HOSTNAME[NUMBERS]||[letter] my question after I used the Perl command in order to replace all old hostnames with new hostnames based on the "RULE" in the Perl command how to verify that the old hostnames not exist in file ? for example previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a more file AAARed_Hat_linux1a verification should be ignore from this line @Red_Hat_linux1a$ verification should be match this line P=Red_Hat_linux1a verification should be match this line XXXRed_Hat_linux1aZZZ verification should be ignore from this line . . . .

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• Some explaination on WLAN adaptor antennas and radios

  - by gert_78

  We have a desktop in a room where the is no wired connection that has bad reception from the wireless AP. Someone (I don't remember who of course) told me there are high gain antennas that will make it possible to get a better reception (and throughput). I believe he said they are adaptors with "high gain" antennas. He also told me he uses it in hotels when he has a bad WLAN reception. When he connects that card the reception and speed is a lot better all of a sudden. But can someone explain me in understandable language what that is and what the thing with high gain, dB, dBi and mW is all about please? What type of card do we need? On like this or this?

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• Where can I get a Linux distro iso based on a 2.4 kernel?

  - by Mike

  I need to get my hands on an ISO file for a Linux distribution with a 2.4 kernel. I'm looking for an ISO specifically so I can use it with my Oracle VirtualBox. Since 2.4 is so old these days, I'll explain that I'm looking for it because my company uses an ancient 2.4 uClinux distro on our ancient hardware in our devices. I'd like to run some "desktop" tests using the same kernel version as what's in the hardware. As far as I can tell I can't run uCLinux on a desktop, so next best thing, I'd like to get anything running 2.4.

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• Displaying X11 Apps on Windows 7

  - by PatW

  I installed a product called xming, a light weight X11 server product on Windows 7 laptop. From remote RHEL system I redirected display to Win7 laptop then launched X11 GUI app. I was not able to launch X11 apps and have them appear on laptop display as intended. To fix it I added -ac to the properties of xming launch desktop icon. I been searching through Windows and xming docs but can't find explanation. My guess is it is like xhost + on unix that allows connections from anybody. Can anybody explain why this worked?

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• Get other ldap query strings associated with a domain.

  - by seekerOfKnowledge

  I have in Softerra LDAP Administration something like the following: server: blah.gov OU=Domain Controllers etc... ldap://subdomain.blah.gov I can't figure out how to, in C#, get those other ldap subdomain query strings. I'm not sure how else to explain it, so ask questions and I'll try to clarify. Updated: This is what Softerra LDAP Administrator looks like. The ldap queries near the bottom are not children of the above node, but somehow, the program knows about them and linked them in the GUI. If I could figure out how, that would fix my problem.

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• "Clear Text Credential Access Enabled" field

  - by Dave

  Searching for answers about the "Clear Text Credential Access Enabled" field, I found a question on an oracle forum that was my exactly what I was trying to find out. Thinking that my answer would soon be found, I happily click on the link only to find zero replies. All hope was lost. I am posting the question here, hoping that someone on this site will know the answer. Can somebody please explain the usage of "Clear Text Credential Access Enabled" checkbox under "-Security-Advanced tab for Weblogic 11g? What is the difference if we set or unset this flag? If I dont set this flag I get an exception like "Access to sensitive attribute in clear text is not allowed due to the setting of ClearTextCredentialAccessEnabled attribute in SecurityConfigurationMBean" when I try to set a value for the "Credential" field. But what should be the value for "Credential" field if I dont set the "Clear Text Credential Access Enabled"flag?

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• Rebuild mdadm RAID5 array with fewer disks

  - by drjeep

  I have a 4 disk RAID5 array, one of which is starting to fail according to smartd. However, since I'm using less than half the space on /dev/md0, I'd like to rebuild the array without the failing disk. The closest scenario I've been able to find online has been this post, however it contains bits that don't apply to me (LVM volumes) and also doesn't explain how I go about resizing the partition after I'm done. Please note I have backups of important data, but I'd like to avoid rebuilding the array from scratch if possible.

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• What are the common linux ( RH ) commands for SAN related activities ? How to check if a LUN is attached to the computer ?

  - by Nishant

  How do I check if a LUN has been presented to my server ? What are the Linux commands for that ? Do the LUNS show up in a fdisk -l command like a normal /dev/sda gets listed ? What are other commands assosicaed with general SAN related checks in Linux ? What is WWN and how does that have any relevance and Also please explain multipathing why if we have LUN's , what is the use of multipathing then ? Bit lenghty but I am not able to get a grasp on the topic . Any help would be appreciated .

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• What happens internally in a router when LAN is configured? [closed]

  - by vindhya

  This week I was trying to setup LAN to my home. I couldn't login to the router webpage even though I tried all the username and password like admin etc... I want to ask: Why username and password is required to access modem/router webpage because its always usually admin and admin? What exactly happens inside router when you type correct username and password. Does the router store it internally or does it ask some ISP servers about it? Could someone explain what exactly happens internally in the router right from the configuration phase?

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• Restoring a backup SQL Server 2005 where is the data stored?

  - by sc_ray

  I have two Sql Server database instances on two different machines across the network. Lets call these servers A and B. Due to some infrastructural issues, I had to make a complete backup of the database on server A and robocopy the A.bak over to a shared drive accessible by both A and B. What I want is to restore the database on B. My first issue is to restore the backup on server B but the backup location does not display my shared drive. My next issue is that server B's C: drive has barely any space left and there are some additional partitions that have more space and can house my backup file but I am not sure what happens to the data after I restore the database on B. Would the backup data fill up all the available space on C:? It will be great if somebody explain how the data is laid out after the restore database is initiated on a target database server? Thanks

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