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• Apple Mail authentication failure to Apache James while Thunderbird connects

  - by dacracot

  I have an Apache James 2.3.2 email server running on RHEL 5. I have been connecting to it successfully for months using Thunderbird (currently version 12.0.1). I am attempting to connect to the same account using Apple's Mail 6.5. On the first dialog, to add an account to Apple's Mail, it asks for full name, email address, and password. It then asks for an incoming mail server. I put account type equal to POP, the incoming mail server equal to the host in my email address, and my username and password. It comes back with the error: "Logging in to the POP server "" failed. Make sure the user name and password you entered are correct, then click Continue. If the information isn't correct, you cannot receive messages." While the dialogs are different in Thunderbird, I believe that I am giving it exactly the same parameters, and succeeding with authentication.

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• How to use X11 forwarding with putty

  - by Neuquino

  I have a VM with RHEL 5 without an X server. My host has Windows 7. I need to connect to the VM and redirect the X11 output of the commands to my host. I know that if my host were a GNU/Linux machine it would be as easy as ssh -X . I'm ussing PuTTy to connect by SSH to the VM, I tried enabling X11 forward option in PuTTy config, but nothing happened. Have you ever done this? I'm quite advanced with GNU/Linux, but a newbie with this toy of Winbug$ 7.

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• grep is inconsistently defaulting to grep -P?

  - by Sammitch

  I have a script that does some housekeeping that works perfectly well when invoked from an interactive shell, but did nothing when invoked by cron. To troubleshoot this I started a shell with a 'blank' environment with the command: env -i /bin/bash --noprofile --norc Using this blank env I've dug into my script and found that the following grep will not match any files: grep -il "^ws_status\s*=\s*[\"']remove[\"']$" However, when run from an interactive shell the command will return the filenames of the matching files. As a note, the expression is matching lines like: WS_STATUS = "remove" Through trial-and-error I discovered that adding -P to the options [Perl regex] the command started working normally in the 'blank' shell. However, I have no idea why my login shell appears to be defaulted to grep -P. There is only one grep binary, /bin/grep There are no aliases defined for grep=pgrep or grep="grep -P" There is no env variable GREP_OPTIONS defined. What's the deal here? Note: OS is RHEL v5.10, Bash is v3.2.25, grep is v2.5.1

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• Windows with putty via USB serial cable to Linux serial port - output ok, input isn't

  - by Aharon Robbins

  I am trying to get two way serial communications going between a Windows XP system and a Linux system (RHEL 5). I have /sbin/agetty -L 9600 ttyS0 in /etc/inittab. I am using a generic USB to serial adaptor on Windows (Unitek) and a null modem cable. I have putty configured for 9600 baud, 8 bits, no parity, one stop bit, no flow control. I get the login prompt from agetty in the putty window but input does not work; I see weird characters in the putty screen. I can echo output into the device from windows and see it, but cat < /dev/ttyS0 just prints out weird characters from what I type. Any and all suggestions will be welcome. Thanks!

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• New host, high load?

  - by dotancohen

  A few minutes ago I signed up at a new webhost. I have yet to move my sites over. Upon initial SSH connection, I checked the load and memory usage, they do seem rather higher than I would like: # uptime 12:06:51 up 71 days, 23:23, 1 user, load average: 9.02, 9.49, 9.45 # free total used free shared buffers cached Mem: 33014800 31927192 1087608 0 2384812 17729816 -/+ buffers/cache: 11812564 21202236 Swap: 16787916 8584 16779332 Is that a bit to packed? I'm only paying about $5 USD per month, so I don't expect <0.1 loads, but ~10 is worrisome. Is it not? Also, there is no /etc/issue file so I tried other methods to guess the OS: # uname -a Linux box358.bluehost.com 2.6.32-20120131.55.1.bh6.x86_64 #1 SMP Tue Jan 31 15:43:27 EST 2012 x86_64 x86_64 x86_64 GNU/Linux # which yum /usr/bin/yum # which apt-get # That looks like CentOS / RHEL 6.2 possibly?

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• WebLogic Server 11g with java based node manager stdout/stderr log path configuration.

  - by Mircea Vutcovici

  Hi, How I can configure the path where the stdout logs are written by the WebLogic server? I've read about -Dweblogic.log.RedirectStdoutToServerLogEnabled=true, but this redirects only part of the output. For example if I will run a thread dump, the output will remain in the original log file. I think it should be an option in nodemanager/startup.properties file. WebLogic version is 10.3.2.0 and I am using a java based node manager. OS is RHEL 5. Thank you, Mircea

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• Fresh Red Hat Enterprise Linux fails to install httpd using yum

  - by Julian

  I'm trying to install a LAMP stack in a fresh red hat server but yum is misbehaving. Being linux illiterate I'm at a loss. $yum install httpd Loaded plugins: security Setting up Install Process No package httpd available. Nothing to do My yum config $ cat /etc/yum.conf [main] cachedir=/var/cache/yum keepcache=0 debuglevel=2 logfile=/var/log/yum.log distroverpkg=redhat-release tolerant=1 exactarch=1 obsoletes=1 gpgcheck=1 plugins=1 # Note: yum-RHN-plugin doesn't honor this. metadata_expire=1h # Default. # installonly_limit = 3 # PUT YOUR REPOS HERE OR IN separate files named file.repo # in /etc/yum.repos.d Other stuff in the yum.repos.d dir $ ls -lah /etc/yum.repos.d/ total 12K drwxr-xr-x 2 root root 4.0K Feb 4 01:15 . drwxr-xr-x 59 root root 4.0K Feb 4 01:28 .. -rw-r--r-- 1 root root 561 Mar 10 2010 rhel-debuginfo.repo What could be going on? I thought "out of the box" RHEL5.5 would be friendlier :)

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• allowing 2 VM's to communicate RED HAT 64 bit

  - by ????? ????????

  My physical PC is running 2 VMs on virtualbox. Both of the VM's are linux 64 bit. I am going through this tutorial: http://www.cyberciti.biz/faq/rhel-centos-fedoracore-linux-network-card-configuration/ in order to expose both of their IP's so that they can speak to each other. Mike Schwager November 25, 2009 at 10:55 pm Whoops! In section 3, you forgot about editing /etc/hosts. I believe RedHat comes complete with the system’s host ip address set up in /etc/hosts. Don’t forget to give it a look. I agree with Mike because after I looked into the /etc/hosts files, it has just default localhost stuff in it. How should I reconfigure the hosts file?

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• slow network in centos5 VM with centos5 host running KVM

  - by dan

  I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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• Linux / apache web-server segmentation fault warnings

  - by jeroen

  Lately I have been receiving a lot of segmentation fault warnings on my web-server. The warnings look like: [notice] child pid xxxx exit signal Segmentation fault (11) I have consulted with the server provider (it is a dedicated redhat enterprise server) and they could not find anything. What I have done so far: Since the error I have already tried the following: I have added more ram I have turned off / turned on several php modules (they sent me to a web-page someone had the same problem, caused by an excessive amount of php modules) At the moments the warnings occur, there seems to be plenty of free ram left and the number of processes is very low (the number of httpd processes is about a quarter of the maximum allowed). What can be causing these errors? Edit: current versions apache: 2.0.52 php: 5.2.8 RHEL 4 Edit 2: Although I asked this a long time ago, I never was able to solve it until I upgraded to php 5.3.

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• Enabling publickey authentication for server's sshd

  - by aaron

  I have two servers running RHEL 5. Both have nearly identical configurations. I have set up RSA Publickey authetication on both, and one works but the other does not: [my_user@client] $ ssh my_user@server1 --- server1 MOTD Banner --- [my_user@server1] $ and on the other server: [my_user@client] $ ssh my_user@server2 my_user@server2's password: --- server2 MOTD Banner --- [my_user@server2] $ server2's /etc/ssh/sshd_config file snippet: RSAAuthentication yes PubkeyAuthentication yes AuthorizedKeysFile .ssh/authorized_keys When I run ssh -vvv I get the following snippet: debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug3: Next authentication method: publickey debug1: Offering public key: /home/my_user/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Authentication that can continue: publickey,gssapi-with-mic,passowrd debug1: Offering public key: /home/my_user/.ssh/id_dsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Authentication that can continue: publickey,gssapi-with-mic,passowrd debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password my_user@server2's password:

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• What's an easy way to install a bunch of OSS apps in my home dir on my company's aging Redhat VNC servers?

  - by subopt

  My company's IT group doesn't want to install lots of common stuff on our VNC servers, which run RHEL 4. The list of stuff i want/need includes graphviz, midnight commander, various python libs, sqlite, netbeans, antlr, jdk1.6, etc. They've hobbled rpm somehow, so i can't do rpm --relocate. And i don't want the RHEL4 compatible revs of this stuff anyway. I've probably got the room to build all this stuff in my home dir, but i don't want to take forever tracking down dependencies. Looking for an easy way to get the apps/tools i need, and nothing (or very little) else. Any suggestions?

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• slow network in centos5 VM with centos5 host running KVM

  - by dan

  I setup KVM following the guide here: http://www.cyberciti.biz/faq/centos-rhel-linux-kvm-virtulization-tutorial/ I setup a bridged network and it worked fine except that the transfer speed is 200KB/s instead of the gigabit speed that I get on the host machine by itself. I tried editing the guest network settings to set "model=virtio" http://wiki.libvirt.org/page/Virtio but this just moves ifconfig-eth0 to ifconfig-eth0.bak in the VM and networking doesn't work at all. I tried moving ifconfig-eth0 back and starting up eth0, which works, but now the transfer speed is ~ 60KB/s I have no idea what else to try. Any suggestions would be greatly appreciated.

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• Which is faster? 4x10k SAS Drives in RAID 10 or 3x15k SAS Drives in RAID 5?

  - by Jenkz

  I am reviewing quote for a server upgrade. (RHEL). The server will have both Apache and MySQL on it, but the reason for upgrade is to increase DB performance. CPU has been upgraded massively, but I know that disk speed is also a factor. So RAID 10 is faster performance than RAID 5, but how much difference does the drive speed make? (The 15k discs in the RAID 5 config is at the top of my budget btw, hence not considdering 4x15k discs in RAID 10, which I assume would be the optimum.)

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• How to build the rpm package with SHA-256 checksum for files?

  - by larrycai

  In standard alone RHEL 6.4 rpm build environment, the rpm packages is generated with SHA-256 check sum, which is gotten by command rpm -qp --dump xxx.rpm [user@redhat64 abc]$ rpm -qp --dump package/rpm/abc-1.0.1-1.x86_64.rpm .. /opt/company/abc/abc/1.0.1-1/bin/start.sh 507 1398338016 d8820685b6446ee36a85cc1f7387d14537d6f8bf5ce4c5a4ccd2f70e9066c859 0100750 user abcc 0 .. While if it is build in docker environment (still RHEL6.4) the checksum is md5 UPDATE Use Ubuntu 14.04 as docker server, Redhat6.4 is the container inside [user@c1cbdf51d189 abc]$ rpm -qp --dump package/rpm/abc-1.0.1-1.x86_64.rpm .. /opt/company/abc/abc/1.0.1-1/bin/start.sh 507 1401952578 f229759944ba77c3c8ba2982c55bbe70 0100750 user abcc 0 .. If I checked the real file, the file is the same [user@c1cbdf51d189 1.0.1-1]$ sha256sum bin/start.sh d8820685b6446ee36a85cc1f7387d14537d6f8bf5ce4c5a4ccd2f70e9066c859 bin/start.sh [user@c1cbdf51d189 1.0.1-1]$ md5sum bin/start.sh f229759944ba77c3c8ba2982c55bbe70 bin/start.sh How I configure rpmbuild to let generated rpm file is SHA-256 based ?

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• Setting Password for phpMyAdmin

  - by anitha

  am using rhel 5 and php 5 with mysql 5. My server is already configured and running all applications smoothly. I am accessing mysql as root and password is 'anitha123'. but when i am accessing phpmyadmin through browser, it is not asking for password. Somebody please tell me how can i set it like prompting for username ans password. Since i am not familiar with php mysql please tell me how to do it in simple way. thanks and regards a anitha

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• Switch HTTP Virtual Host to HTTPS Virtual Host

  - by Kumar

  We are using apache web server with RHEL 6.4. Currently we configured Name based virtual host on server. Enabled "Namebased Virtualhost *:80" and created /etc/httpd/conf.d/example-com.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /var/www/vhost/example.com/public_html ServerName www.example.com ServerAlias example.com ErrorLog /var/log/httpd/vhosts/example-com-error_log CustomLog /var/log/httpd/vhosts/example-com-access_log common </VirtualHost> I've located my ssl certificates by /etc/httpd/conf.d/ssl.conf In this case how can I switch 80 site to 433 and also redirect all requests to 80 to 443

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• Reversing an lvreduce of LVM to original size

  - by praspa

  On a RHEL system that uses LVM 2 with 4K blocks. Have been successful in reducing the LV, but trying to get steps to reverse the operation so that the LV returns to its original size. Using these steps to reduce the LV by 1GB, # umount /foo # e2fsk -f /dev/mylvm/foo # resize2fs /dev/mylvm/foo <Current LV Block count - 1GB/4K> # lvreduce --size <Current # GB - 1GB> /dev/mylvm/foo Then to reverse the reduction # lvextend --size <Original #GB> /dev/mylvm/foo # resize2fs /dev/mylvm/foo The reversal gets close to the orignal size. A 'df -h' reports that it seems to be about ~ 0.1GB shy of the original size. Using these utilities, is there a better procedure to shrink and grow the LV so that the original state can be recovered effectively?

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• On boot firmware request for intel GMA 3100 chipset timing out

  - by Yannick M.

  I am currently in the process of installing a Gentoo linux box with a Vanilla 2.6.29-r5 kernel with gentoo-xen-kernel patches in order to run the Xen Hypervisor. After rebooting with the new kernel, the booting process seemed to hang on: [ 0.863005] platform microcode: firmware: requesting intel-ucode/06-0f-07 [ 60.863442] Microcode Update Driver: v2.00-xen <[email protected]>, Peter Oruba Apparently the firmware request times out after 60 seconds (/sys/class/firmware/timeout) and booting just continues. I have done some research and have found that on RHEL-4 this problem was related to the mount of /sys changed and the firmware.agent hotplug script couldn't parse the line correctly. However I am having some difficulty tracking down how to fix this on Gentoo. Any and all ideas are greatly appreciated! Thanks

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• kernel: journal commit I/O error

  - by jasondewitt

  I am having some problems with a Dell 1950 server. I am installing RHEL 4.6 along with Oracle and some other software on here. I am randomly getting an error message saying "kernel: journal commit I/O error" on my ssh session and on the monitor I have hooked up to the server I see an error scrolling by that says "EXT3-fs error (device sda5) in start_transaction: Journal has aborted." It has happened several times but never at the same point during the install. Actually, this last time the system was up and running and I was just trying to import a database into oracle. This has happened on several hard drives, so I'm pretty sure that is not the problem. This makes me think the raid controller is going bad. What do you guys think? ** UPDATE ** Pretty sure it was a bad hard drive. I threw another drive in the server and it's been running for about 48 hours with out problems.

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• Track IP Messenger's chatting by wireshark

  - by Kumar P

  We have Linux server ( RHEL 5 ), and some client machines ( Windows XP ) in local area network. We using server as proxy server. I am using squid proxy. My windows machines using internet by proxy. Now my client machines using IP messenger for chatting and sharing files with in local network. How can i trace what they are doing or chatting by ip messenger, from my server by wireshark packet sniffer ? If i can't do it by wireshark , What will you give idea about it...

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• mac osx active directory authentication and linux samba share problems.

  - by Matt Delves

  As a precursor, the network setup is one that includes a combination of Novell Netware servers as well as Windows Servers and Linux servers. I've successfully been able to bind my mac to the Windows Domain and can login without any problems. I've been able to mount shares without needing to resupply login credentials to any windows based share. The problem I've found is that when I'm attempting to mount a share from a linux server, it is asking to resupply the login credentials. Has anyone experienced this kind of problem. The linux servers are a combination of SLES 10 and 11 and RHEL 4 and 5. Thanks, Matt

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• Can I ? - Develop C/C++ in Fedora 14 using GCC 4.4 and deploy in CentOS 5.2 using GCC 4.4

  - by Amit Phatarphekar

  Hello - My production env runs CentOS 5.2 and 5.5 versions. I have to develop a new tool using C/C++ and deploy it on this production env. I was planning to use Fedora 14 on my desktop with GCC 4.4 to do the development with Eclipse IDE. And then later I want to deploy the executables to CentOS 5.2 or 5.5 The production env will have GCC 4.4 as well. Since both Fedora and CentOS are RHEL based, I thought this is possible. So can I do this? Or do I need to have CentOS 5.2/5.5 on my development desktop as well? Thanks Amit

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• Why do strace/truss sometimes 'fix' stuck processes?

  - by Emmel

  Sometimes you have a stuck process that's been stuck for a while, and as soon as you go to poke at it with strace/truss just to see what's going on, it gets magically unstuck and continues to run! So from merely 'observing' these programs have some impact in the running of the stuck programs .. what's happening here? Did strace (I guess via ptrace(2)?) send a signal, causing the program to cease blocking, or such? I've seen this several times -- most recently on Linux RHEL 4 (and a Perl script mucking with processes and doing some network IO in that case), but in a few other contexts as well. Unfortunately, I can't reproduce this, as it times to happen ... in times of crisis. But my curiosity remains. :-) Any elucidation appreciated.

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• What is the difference between "su --command" and "su --session-command"?

  - by oliver

  Running # su - oliver --command bash gives a shell but also prints the warning bash: no job control in this shell, and indeed Ctrl+Z and fg/bg don't work in that shell. Running # su - oliver --session-command bash gives a shell without printing the warning, and job control indeed works. The suggestion to use --session-command comes from Starting a shell from scripts using su results in "no job control in this shell" which states "[a security fix for su] changed the behavior of the -c option and disables job control inside the called shell". But I still don't quite understand this. When should one use --command and when should one use --session-command? Is --command (aka -c) more secure? Or should one always use --session-command, and --command is just left in for backwards compatibility? FWIW, I'm using RHEL 6.4.

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