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• VLAN setup on my PC

  - by Surjya Narayana Padhi

  Hi Geeks, I am bit new to VLAN. I want my two computers communicate through VLAN. I have following queries. As I am new to it my queries may be somewhat vague in some points. But i would like to hear from experts for my basic queries. I have two PCs Computer A and Computer B in two different IP networks Network A and Network B Both my PC has windows OS installed. How to send a VLAN(#Number) tagged packet from Computer A to Computer B and how to detect and untag the packet at Computer B? (Please provide the steps for windows OS) For this action do I need to check if my ethernet card supports VLAN tagging/untagging? If yes how can I know if my card supports it or not? Is the VLAN applied for Wireless ethernet controllers also? Do I need any switch or router for this action? Experts please given your inputs so that I can have a strong basic. If anyone can give some inputs how i can detect those VLAN in wireshirk, it will be helpful me also. Thanks in advance.

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• Ext3 fs: Block bitmap for group 1 not in group (block 0). is fs dead?

  - by ip

  My company has a server with one big partition with Mysql database and php files. Now this partition seems to be corrupted, as reported from kernel messages when I tried to mount it manually: [329862.817837] EXT3-fs error (device loop1): ext3_check_descriptors: Block bitmap for group 1 not in group (block 0)! [329862.817846] EXT3-fs: group descriptors corrupted! I've tried to recovery it running tools from a PLD livecd. These are the tools I have tested: - e2retrieve - testdisk - photorec - dd_rescue/dd_rhelp - ddrescue - fsck.ext2 - e2salvage without any success. dumpe2fs 1.41.3 (12-Oct-2008) Filesystem volume name: /dev/sda3 Last mounted on: <not available> Filesystem UUID: dd51610b-6de0-4392-a6f3-67160dbc0343 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal filetype sparse_super Default mount options: (none) Filesystem state: not clean with errors Errors behavior: Continue Filesystem OS type: Linux Inode count: 9502720 Block count: 18987570 Reserved block count: 949378 Free blocks: 11555345 Free inodes: 11858398 First block: 0 Block size: 4096 Fragment size: 4096 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Last mount time: Wed Mar 24 09:31:03 2010 Last write time: Mon Apr 12 11:46:32 2010 Mount count: 10 Maximum mount count: 30 Last checked: Thu Jan 1 01:00:00 1970 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Journal backup: inode blocks dumpe2fs: A block group is missing an inode table while reading journal inode e2fsck 1.41.3 (12-Oct-2008) fsck.ext3: Group descriptors look bad... trying backup blocks... fsck.ext3: A block group is missing an inode table while checking ext3 journal for /dev/sda3 I tried also backup superblocks, same error result. There's any other tools I have to test before considering these disk definitely unrecoverable? Many thanks, ip

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• SQL Server Remote Connections

  - by Barry

  Hi, I am at my wits end with trying to access a remote SQL Server 2008 R2 Express instance. Here are the following that I have tried. 1) I enabled remote connections in the instance properties. 2) I enabled sql server and windows authentication mode and created an account to log in using sql server authentication. 3) I started the SQL Server Browser service 4) I forwarded ports 1433 and 1434 on the router to the IP address of the machine hosting SQL Server. 5) I turned off firewalls on both the Machine running the instance and the router. 6) http://www.yougetsignal.com/tools/open-ports/ I used this to check whether or not both ports were open and it says that they are closed. I have the SQL Server Express instance running and the browser running. I have configured it to allow remote connections yet, it tells me they are both closed. I'm pretty confused at this stage. On the client Machine I am trying to connect using the following format machineip\SQLEXPRESS with SQL Server Management Studio Express. Thanks in advance

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• Dovecot (on Mac OS X Server 3 - Mavericks) giving “Error: Failed to autocreate mailbox INBOX: Permission denied”

  - by user2965240

  I recently upgraded my server to Mavericks and I thought everything had gone perfectly. As it turns out, that was not exactly the case. After everything working fine for a week or so, I created a new user and my mail server flat out stopped working. Most frustratingly, there were no log errors (in any of the many mail logs) which shed any light on the cause. After much trial and error, I finally got my mail server functioning (partially) by reinstalling server and restoring the mail folder from the previous day's backup (yay for backups). However, as is often the case, there were MANY permission issues. After slogging through various permission problems, I believe that my system is now receiving mail, however none of my users can check it because every time someone attempts to login the server generates following error: Error: Failed to autocreate mailbox INBOX: Permission denied I would assume that this is yet another permissions problem, however after much searching, I still cannot resolve this. To be clear, I don't want Dovecot to autocreate any mailboxes at this point because all of the mailboxes should exist. Any help on this would be sooooooo greatly appreciated. P.S. On a side note: why is it that repairing permissions never takes care of difficult issues like these? That would be awfully helpful...

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• GA 8KNXP Rev1.0: 4GB installed, only 3.5 recognized by BIOS

  - by hurikhan77

  I've installed 2x 1 GB and 4x 512 MB memory into my GA-8KNXP system which would sum up to 4GB. The specs from the manual say: Maximum memory support: 4GB. If all six slots are utilized, slot 5+6 may only equipped with single-sided RAM modules. And so I did. Anyway: The BIOS counts up to 3.5 GB and finishes there. Also my linux system reports only 3.5 GB of memory although 4 GB memory support is activated in the kernel. So I suppose this is a memory mapping issue or a hardware issue. I've tried removing only on of the 512 MB memory modules leaving 5 modules in place. But that just stopped the system from powering on correctly (screen stays black although fans and leds come to live). Dual Channel was detected and enabled so the system technically found all 6 modules. "dmidecode" in linux reports only memory in slots 1 to 4 and ignores slots 5+6, so it only detects 3 GB of memory. It also says the system would support up to 16 GB of memory with 4 GB modules per slot. I think technically the chipset should be able to offer and utilize the complete 4 GB memory range. Any clues what else I could check? Or do I have just to live with 0.5 GB wasted memory?

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• In solaris, how monitor & auto-respond to critical events

  - by mamcx

  I have a website that randomly fail. Is running in open solaris on joyent. I have a monitoring service that alert me when the site is down, but, I want a way to put a "insider" tool that tell me why that happened. Is because the cpu is too high? Not memory? Which process fail? Is possible to have a backtrace of that? Everything is running on the Solaris Service Management Facility. The webserver is cherokee, the database is mysql and the language is python/django. I want the most simple setup to monitor that & auto-respond , ie: restart the webserver or the django process in case of failure. I prefer a low-overhead tool. I don't need the fancy monitoring that some tools have, no ned graphs or sms alert. Only know what fail, restart it if possible (maybe up to n times), and have a log somewhere when I will check it.

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• SQL Server Remote Connections

  - by Barry

  Hi, I am at my wits end with trying to access a remote SQL Server 2008 R2 Express instance. Here are the following that I have tried. 1) I enabled remote connections in the instance properties. 2) I enabled sql server and windows authentication mode and created an account to log in using sql server authentication. 3) I started the SQL Server Browser service 4) I forwarded ports 1433 and 1434 on the router to the IP address of the machine hosting SQL Server. 5) I turned off firewalls on both the Machine running the instance and the router. 6) http://www.yougetsignal.com/tools/open-ports/ I used this to check whether or not both ports were open and it says that they are closed. I have the SQL Server Express instance running and the browser running. I have configured it to allow remote connections yet, it tells me they are both closed. I'm pretty confused at this stage. On the client Machine I am trying to connect using the following format machineip\SQLEXPRESS with SQL Server Management Studio Express. Thanks in advance

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• HP Proliant DL380 G4 - Can this server still perform in 2011?

  - by BSchriver

  Can the HP Proliant DL380 G4 series server still perform at high a quality in the 2011 IT world? This may sound like a weird question but we are a very small company whose primary business is NOT IT related. So my IT dollars have to stretch a long way. I am in need of a good web and database server. The load and demand for a while will be fairly low so I am not looking nor do I have the money to buy a brand new HP Dl380 G7 series box for $6K. While searching around today I found a company in ATL that buys servers off business leases and then stripes them down to parts. They clean, check and test each part and then custom "rebuild" the server based on whatever specs you request. The interesting thing is they also provide a 3-year warranty on all their servers they sell. I am contemplating buying two of the following: HP Proliant DL380 G4 Dual (2) Intel Xeon 3.6 GHz 800Mhz 1MB Cache processors 8GB PC3200R ECC Memory 6 x 73GB U320 15K rpm SCSI drives Smart Array 6i Card Dual Power Supplies Plus the usual cdrom, dual nic, etc... All this for $750 each or $1500 for two pretty nicely equipped servers. The price then jumps up on the next model up which is the G5 series. It goes from $750 to like $2000 for a comparable server. I just do not have $4000 to buy two servers right now. So back to my original question, if I load Windows 2008 R2 Server and IIS 7 on one of the machines and Windows 2008 R2 server and MS SQL 2008 R2 Server on another machine, what kind of performance might I expect to see from these machines? The facts is this series is now 3 versions behind the G7's and this series of server was built when Windows 200 Server was the dominant OS and Windows 2003 Server was just coming out. If you are running Windows 2008 R2 Server on a G4 with similar or less specs I would love to hear what your performance is like.

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• LG LW20 Express won't boot after hdd replace

  - by Mika

  My old laptop (LG LW20 Express) got a hdd failure and I replaced the hdd. Now the laptop won't boot from cd or usb. I'm trying to install ubuntu on it. When I turn the laptop on it shows me the startup screen but when it should be the time to load operating system it just gives a black screen and starts over. This loop continues until I shut down the laptop. I created the usb boot drive following this guide https://help.ubuntu.com/community/Installation/FromUSBStick/ I used my boot cd to install ubuntu on this machine I'm using right now. So at least the cd should work. From the BIOS I can see that my newly installed hdd is recognized and put as a secondary master. Also the cd and removable media are in the boot list before hdd. The laptop runs pretty hot. The fan is at full speed pretty soon after the laptop is turned on. Earlier I suspected that it would have been the almost broken hdd that would have produced that heat but there obviously is something else also. Any ideas what to check?

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• Server stops responding, can't find issue?

  - by Corey W

  I've had a pretty basic server up and running CentOS with webserver/database, and have noticed that it has locked up a few times in the middle of the night. It seems to happen randomly. When it locks up I can ssh in, (although it seems to hang once connected), but can't access cpanel/whm and have to reboot the server to get everything back up. Checking the messages log I see the below like clockwork every 5minutes 1 second, and then it just stops logging anything until I reboot. I can't seem to find any log showing any issue? Is there somewhere I can check to try to figure out what is happening? Could this be caused by CPU being maxed? Nov 17 08:01:35 s1 pure-ftpd: (__cpanel__service__auth__ftpd__Q13SKrtaCJCHjBezTfU8Iqmsi@127.0.0.1) [INFO] Logout. Nov 17 08:06:36 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:06:36 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__mxidFBSnQXmR0QzqSxlqrXLIH0CmJ0GPh9bZ5V3 is now l ogged in Nov 17 08:06:37 s1 pure-ftpd: (__cpanel__service__auth__ftpd__mxidBDaCgnqSxlqrXLIH0CmJ0GPh9bZ5V3@127.0.0.1) [INFO] Logout. Nov 17 08:11:37 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:11:38 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__T4B7F71acf1dsdJSeJHdqKNcbOdpzNnN_GttgcM is now l ogged in Nov 17 08:11:38 s1 pure-ftpd: (__cpanel__service__auth__ftpd__T4B7F71acf1KNcbOdpzNnN_GttgcM@127.0.0.1) [INFO] Logout. Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] New connection from 127.0.0.1 Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] __cpanel__service__auth__ftpd__W5C1RzumtaNwe4cU8Lt1 is now logged in Nov 17 08:16:38 s1 pure-ftpd: ([email protected]) [INFO] Logout. Nov 17 09:10:58 s1 kernel: imklog 4.6.2, log source = /proc/kmsg started. Nov 17 09:10:58 s1 rsyslogd: [origin software="rsyslogd" swVersion="4.6.2" x-pid="1094" x-info="http://www.rsyslog.com"] (re)start Nov 17 09:10:58 s1 kernel: Initializing cgroup subsys cpuset

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• Blocking an IP from connecting

  - by Sam W.

  I have a problem with my Apache webserver where there's and IP than connecting to my server, using alot of connection and wont die which eventually making my webserver timeout. The connection will stay as SYN_SENT state if I check using netstat -netapu I even flush my iptables and use the basic rules and it still doesn't work. The IP will get connected when I start my Apache Basic rules that I use: iptables -A INPUT -i lo -j ACCEPT iptables -A INPUT ! -i lo -d 127.0.0.0/8 -j REJECT iptables -A INPUT -s 89.149.244.117 -j REJECT iptables -A OUTPUT -s 89.149.244.117 -j REJECT iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A OUTPUT -j ACCEPT iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 443 -j ACCEPT iptables -A INPUT -p tcp --dport 21 -j ACCEPT iptables -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT iptables -A INPUT -j REJECT iptables -A FORWARD -j REJECT The bold part is rule in question. Not sure this is related but tcp_syncookies value is 1. Can someone point out my mistake? Is there a way to block it for good. Thank you

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• Remote paging with Nagios when network is down and email won't work -- cellular modems and alternatives

  - by Quinten

  What is the best option for remote paging when network services are down? I'm looking for a solution that can let me know when network services are down during off-hours only, and especially when email/smtp services are out. Therefore, it needs to be redundant to our network and power supply. I'm imagining a cellular modem is one option. What's the price range for these? Is anybody using them and feel that they are worth the cost? I'm imagining that it's something we would end up sending an emergency page ~ 1x/month at most, so I'd like the pricing to reflect that--I don't mind a high per-page cost as long as it has a low recurring cost. Another option would be to expose at least one server to remote ping, and run a check script on a remote server. Are there paid options for this? Currently, we run Nagios on a Linux VM on a Windows 2008 Hyper-V host. It would be great if the solution would work in that environment, but I know it's tricky with external devices, and we could move Nagios to a standalone workstation if needed.

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• Nagios check_host_alive and check_ping not showing host as down

  - by Kyle

  I am using the check_host_alive command to send 5 packets every minute to all my routers at remote locations. I noticed today I received a notification from The AT&T Global Client Support Center that a router was down (which can take 5-30 minutes to send these notices out) and never received a notice from Nagios. I went onto Nagios and it is was showing the host as alive with a latency of 0ms. This tells me it is seeing the automated response from my router in the data center that, "TTL expired in transit" as a reply from the remote router. Is there anyway for me to tell nagios to check where the reply is comming from? I feel like other people have to of had this issue... I tested it with the check_ping command and it produced the same results. I have the command defined has %hostname% and the proper IP in the host definition, and it works fine for telling me the latency is high. Any ideas are welcome, I have already exercised my Google skills with no results. EDIT: root@IM-UBTU:/# /usr/local/nagios/libexec/check_ping -H 192.168.250.1 -w 100.0,10% -c 200.0,20% -vvv CMD: /bin/ping -n -U -w 10 -c 5 192.168.250.1 Output: PING 192.168.250.1 (192.168.250.1) 56(84) bytes of data. Output: From 10.69.10.2 icmp_seq=1 Time to live exceeded It knows something is wrong why doesn't it give me a warning?

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• apache: can't renew ssl certificate

  - by Caballero

  I have Godaddy SSL certificate for one website on my dedicated server running Centos 5.3 / Apache 2.2.3. I have renewed certificate on Godaddy recently, however now it's showing as expired on my website. I've re-keyed certificate since and reuploaded domain.key, domain.crt and bundle.crt (example file names) files to the server, restarted apache, but the sertificate still shows as expired. I'm running out of clues. I've tried replacing content of .crt files with jiberish and restart apache - it's still showing that certificate is expired, even though it shouldn't be picked up at all. I eventually rebooted dedicated server, still no luck. I'm using free SSL check tool http://www.digicert.com/help/ which clearly shows all the green checks except one - certificate is expired. Has someone any idea what might be causing this? Could there be some kind of caching going on here? UPDATE: after running openssl x509 -in domain.crt -noout -enddate I'm getting this output: notAfter=Jun 2 08:16:51 2013 GMT So I asume this means I have the right certificate on the server and yet the old expired one shows on the web...

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• Removing resource limits on Solaris 10

  - by mikeydonkey

  How should one remove all potential artificial resource limitations for a process? I just saw a case where a server application consumed resources so that some limitation was hit. The other shells into the same server etc were all extremely slow (waiting for something to free up for them; ie. prstat starting 5 minutes). It wasn't CPU/memory related problem so I think it has got something to do with ulimits / projects. Already managed to set the maximum open files to 500 000 and it helped a little bit. However there is something else and I can not figure out what resource is maxed out. I can get some in-house administrator probably to check this but I would like to understand how I could make sure there shouldn't be any limitations! If you think I am going the wrong way (would be better to figure out what limitation should be specfically tuned etc) please feel free to point me to the correct way. I know technical stuff - it's just Solaris 10 that is giving me headache :/

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• Installing checkinstall on x86_64 bit

  - by SephMerah

  I downloaded the source for check install. checkinstall-1.6.2.tar.gz. I then tar -xzvf checkinstall-1.6.2.tar.gz Then I make. It prints this error: [root@ip-50-63-180-135 checkinstall-1.6.2]# make for file in locale/checkinstall-*.po ; do \ case ${file} in \ locale/checkinstall-template.po) ;; \ *) \ out=`echo $file | sed -s 's/po/mo/'` ; \ msgfmt -o ${out} ${file} ; \ if [ $? != 0 ] ; then \ exit 1 ; \ fi ; \ ;; \ esac ; \ done make -C installwatch make[1]: Entering directory `/home/sofiane/checkinstall-1.6.2/installwatch' gcc -Wall -c -D_GNU_SOURCE -DPIC -fPIC -D_REENTRANT -DVERSION=\"0.7.0beta7\" installwatch.c installwatch.c:2942: error: conflicting types for 'readlink' /usr/include/unistd.h:828: note: previous declaration of 'readlink' was here installwatch.c:3080: error: conflicting types for 'scandir' /usr/include/dirent.h:252: note: previous declaration of 'scandir' was here installwatch.c:3692: error: conflicting types for 'scandir64' /usr/include/dirent.h:275: note: previous declaration of 'scandir64' was here make[1]: *** [installwatch.o] Error 1 make[1]: Leaving directory `/home/sofiane/checkinstall-1.6.2/installwatch' make: *** [all] Error 2 I searched extensively on this issue and this solution looks promising. Should I attempt to install checkinstall as an fpm? What would be the best way to go about that? Centos 6.3 x86_64

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• How do I install php 5.3 on CentOS?

  - by fivelitresofsoda

  Hi, I have to install php5.3 on my centos server. If i do yum install php, the base repo installs 5.1.6 which is too old for the apps i need to install. So i've been trying to use the ius repository, following the official instructions from ius: root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/ius-release-1-2.ius.el5.noarch.rpm root@linuxbox ~]# wget http://dl.iuscommunity.org/pub/ius/stable/Redhat/5/x86_64/epel-release-1-1.ius.el5.noarch.rpm root@linuxbox ~]# rpm -Uvh ius-release*.rpm epel-release*.rpm Ok. Now i simply do yum install php53, etc for all i need... but i get this error: Running rpm_check_debug Running Transaction Test Finished Transaction Test Transaction Check Error: file /usr/bin/php from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /usr/bin/php-cgi from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /usr/share/man/man1/php.1.gz from install of php53u-cli-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-cli-5.1.6-27.el5_5.3.x86_64 file /etc/php.ini from install of php53u-common-5.3.4-3.ius.el5.x86_64 conflicts with file from package php-common-5.1.6-27.el5_5.3.x86_64 Error Summary ------------- I have no idea how to solve this. I think i have to delete the base packages however as a linux noob i don't know how to do that. Please help. Thank you.

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• Install Apache + PHP on CentOS server

  - by Scott

  Hi everyone, I am trying to use YUM to install Apache and PHP on CentOS but keep getting these errors. Anyone know what's wrong? Thanks! Loading mirror speeds from cached hostfile * c5-testing: dev.centos.org Setting up Install Process Parsing package install arguments Resolving Dependencies --> Running transaction check ---> Package httpd.i386 0:2.2.8-1.el5s2.centos set to be updated --> Finished Dependency Resolution Dependencies Resolved ============================================================================= Package Arch Version Repository Size ============================================================================= Installing: httpd i386 2.2.8-1.el5s2.centos c5-testing 1.0 M Transaction Summary ============================================================================= Install 1 Package(s) Update 0 Package(s) Remove 0 Package(s) Total download size: 1.0 M Is this ok [y/N]: y Downloading Packages: Running rpm_check_debug ERROR with rpm_check_debug vs depsolve: Package perl-libapreq needs perl(Apache::Table), this is not available. Package perl-libapreq needs perl(mod_perl) >= 1.17, this is not available. Package perl-libapreq needs perl(mod_perl) >= 1.17, this is not available. Package apache-devel needs apache = 1.3.41, this is not available. Complete! bash-3.2#

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• What's the piece of hardware listening on Facebook's or Wikipedia's IP address?

  - by Igor Ostrovsky

  I am trying to understand how massive sites like Facebook or Wikipedia work, for my intellectual curiosity. I read about various techniques for building scalable sites, but I am still puzzled about one particular detail. The part that confuses me is that ultimately, the DNS will map the entire domain to a single IP address, or a handful of IP addresses in the case of round-robin DNS. For example, wikipedia.org has only one type-A DNS record. So, people from all over the world visiting Wikipedia have to send a request to the one IP address specified in DNS. What is the piece of hardware that listens on the IP address for a massive site, and how can it possibly handle all the load coming from the requests for users all over the world? Edit 1: Thanks for all the responses! Anycast seems like a feasible answer... Does anyone know of a way to check whether a particular IP address is anycast-routed, so that I could verify that this really is the trick used in practice by large sites? Edit 2: After more reading on the topic, it appears that anycast is not typically used for dynamic web content. Anycast is usually used for UDP (e.g., DNS lookups), or sometimes for static content. One interesting thing to note is that Facebook uses profile.ak.fbcdn.net to host static content like style sheets and javascript libraries. Each time I ping this name, I get a response from a different IP address. However, I can't tell whether this is anycast in action, or a completely different technique. Back to my original question: as far as I can tell, even a large site will have a single expensive piece of load-balancing hardware listening on its handful of public IP addresses.

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• Site resolves fine without "www", "www" creates database error

  - by PatrickS

  Working with BOA ( Barracuda / Octopus / Aegir ) , I've installed a few Drupal sites without any problems and following the same process for all. BOA is running on Nginx. All sites are going thru Cloudflare's network , where I set the same DNS settings. A example.com points to IPADDRESS A www points to IPADDRESS the nameservers of each domain are pointing to Cloudflare's respective nameservers. It all works , except for one site that works perfectly without "www" , but with "www" returns the typical database error if Drupal can't find the site's database. Site off-line The site is currently not available due to technical problems. Please try again later. Thank you for your understanding. If you are the maintainer of this site, please check your database settings in the settings.php file and ensure that your hosting provider's database server is running. For more help, see the handbook, or contact your hosting provider. In BOA, all sites have the same alias, basically a symlink, redirecting like this... www.example.com - example.com

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• Is VGA port hot-pluggable?

  - by Martin Bøgelund

  In meetings, I often see people detaching the VGA connector from one running laptop and connecting it to another, while the projector is still on. Is this 100% risk free, and OK by design of the VGA standard? If there's a risk involved in hot-plugging VGA, can it be removed by turning off or suspending either laptop, display, or both? I see this being done all the time without causing disaster, so clearly I'm not interested in answers stating "we do it all the time, so it should be OK!". I want to know if there's a risk - real or in theory - that something breaks when doing this. EDIT: I did an internet search on the topic, and I never found a clear statement as to why it is safe or unsafe to hot swap VGA devices. The typical form is a forum question asking basically the same question as I did, and the following types of statements Yes it's hot swappable! I do it all the time! It involves some kind of risk, so don't do it! You're some kind of moron if you think there's a risk, so just do it! But no explanation as to why it safe or not... Joe Taylors answer below contains a link to a forum post and answers that basically give me the same statements as mentioned above. But again, no good explanation why. So I looked for an actual manual for a projector, and found "Lenovo C500 Projector User’s Guide". It states on page 3-1: Connecting devices Computers and video devices can be connected to the projector at the same time. Check the user’s manual of the connecting device to confirm that it has the appropriate output connector. [image] Attention: As a safety precaution, disconnect all power to the projector and devices before making connections. But again, no good explanation.

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• Recommendations for handling Directory Harvesting spam on Exchange 2003

  - by Aaron Alton

  Our Exchange server is getting slammed with anywhere between 450,000 and 700,000 spam messages per day. We receive about 1700 legitimate messages in the same time frame. Roughly 75% of the spam is directory harvesting. We currently have GFI MailEssentials installed. To it's credit, it's doing a very good job, but the sheer volume of spam that we're receiving, and the number of connections that our exchange server is making is preventing legitimate email from being delivered in a timely manner. GFI is set up to check for directory harvesting at the SMTP level, which I presume intercepts the mail before it hits the Exchange services , or goes through SMSE. This "module" is ordered at the top of the list, so (hopefully) dealing with the harvesting is consuming a minimum amount of server resources and bandwidth. My question is, is there anything I can do to prevent our Exchange server's connection pool from being eaten up by these spam hosts? We had to limit the number of concurrent connections being made by Exchange, because it was consuming all of our bandwidth. Thanks, in advance.

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• DNS Issue- Nameserver Issue

  - by Master-Man

  I setup new server on centos 5.3 and configure dns and hostnam using WHM. I also register my new nameservers with my domain registrar with ns1.example.com and ns2.example.com. But i am unable to ping hostname and NS. ping pc2.example.com or ping ns1.example.com I received the below email from server. IMPORTANT: Do not ignore this email. Your hostname (pc2.example.com) could not be resolved to an IP address. This means that /etc/hosts is not set up correctly, and/or there is no dns entry for pc2.example.com. Please be sure that the contents of /etc/hosts are configured correctly, and also that there is a correct 'A' entry for the domain in the zone file. Some or all of these problems can be caused by /etc/resolv.conf being setup incorrectly. Please check that file if you believe everything else is correct. You may be able to automatically correct this problem by using the 'Add an A entry for your hostname' option under 'Dns Functions' in your Web Host Manager. When I issue the command root@pc[~]# host pc2.example.com I receive the below error that Host pc2.example.com not found: 3(NXDOMAIN) I added A entries for hostname and Nameservers but nothing replies. Its almost more than 72 hours for setting & registering nameservers and dns configurations. thanks,

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• Windows 7 hangs after going into sleep a second time

  - by Brian Stephenson

  I've searched everywhere around Google and can't figure out why this is happening so I decide to ask here to see if anyone has a problem like this. Like it says in the title, whenever I sleep ONCE I'm able to wake the system, but going back to sleep again AFTER waking up for the first time results in it hanging on no input and no output, with the fan spinning as fast as possible and alot of heat being spewed out by the fan as well. I've tried various things like setting all USB Hub Root's to not get switched off for power saving, disabling USB selective suspend, disabling PCI-e link state power management, and even unplugging ALL USB devices and it wont wake up after the second attempt. And I've even waited up to a full hour of the CPU fan spinning loudly and it's still stuck trying to wake up. The only USB devices I use are a Microsoft USB Comfort Curve Keyboard 2000 (IntelliType Pro) and a generic HID compliant mouse from Creative model number OMC90S "CREATIVE MOUSE OPTICAL LITE". My other devices like external drives and controllers are unplugged when I'm not using them as having too many USB devices plugged in at a time causes a deadlock on almost all of the ports I have. Here's my system specifications (Most of these are from CPU-Z): Brand: Gateway DX4300-19 Mainboard: Gateway RS780 Chipset: AMD 780G Rev 00 Southbridge: AMD SB700 Rev 00 LPCIO: ITE IT8718 BIOS: American Megatrends Inc. ver P01-A4 09/15/2009 CPU: AMD Phenom II X4 810 at 2.60 GHz RAM: 8.0 GB DDR2 Dual Channel Ganged Mode at 400 MHz GPU: ATI Radeon HD3200 Graphics Intergrated - RS780 OS: Windows 7 Home Premium x64 OEM (Acer Group) HDD: WDC WD10EADS-22M2B0 1.0 TB (Western Digital Green Caviar) My BIOS has absolutely no control over how I setup the sleep mode to be either S1 or S3. So I can't check these settings or even change them. Hybrid sleep is also disabled, I can successfully go into hibernation and wake from hibernation but this is painfully slow due to a harddrive problem I'm having with this "Green Drive". (Hibernation takes over ~3 minutes to complete) Any help would be appreciated, thanks.

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• Windows Server 2012 Hyper-V very slow

  - by Matt Taylor

  I have been running several Hyper-V VMs on Windows Server 2008 R2 for the past couple of years and enjoying perfectly adequate performance for my testing/development/r&d environments. I'm a software developer so my hardware knowledge is basic however I built the rig using: •Gigabyte GA-X58A-UD3R Intel X58 (Socket 1366) DDR3 Motherboard •Intel Core i7 960 3.20GHz (Bloomfield) (Socket LGA1366) •24GB triple channel RAM The host OS is running on an OCZ SSD and all the VMs are running on a 2TB Marvell SATA3 RAID 0 array consisting of 2 Western Digital Caviar Black 7,200rpm drives. I have tested the speed of the 2TB drive and appear to be getting less than 3Mbs but it can adequately run a 4 VM farm including a DC, (SQL) database and IIS application servers. I recently upgraded the SSD on which the host runs to a 256GB OCZ Vertex 4 and took the opportunity to upgrade to Windows Server 2012 and installed the Hyper-V role. I tried importing one of my existing Windows Server 2008 R2 VMs (and converted it to .vhdx) plus I have tried creating a brand new Windows Server 2008 R2 VM but both are running extremely slowly and I can see nothing obvious using the host and guest Task Manager/Resource Monitor tools. In both cases the VM has 8GB RAM (fixed), 4 CPUs, fixed size HD (not expanding) and is using an external virtual network running on a separate NIC to the host. I have upgraded the BIOS to the latest available version and checked the virtualization settings. I have run out of "obvious" (to a developer) things to check/configure and my next option will be to re-install the host OS but before I do I would very much appreciate any advice from any experts out there. Thanks

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