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• need for tcp fine-tuning on heavily used proxy server

  - by Vijay Gharge

  Hi all, I am using squid like Internet proxy server on RHEL 4 update 6 & 8 with quite heavy load i.e. 8k established connections during peak hour. Without depending much on application provider's expertise I want to achieve maximum o/p from linux. W.r.t. that I have certain questions as following: How to find out if there is scope for further tcp fine-tuning (without exhausting available resources) as the benchmark values given by vendor looks poor! Is there any parameter value that is available from OS / network stack that will show me the results. If at all there is scope, how shall I identify & configure OS tcp stack parameters i.e. using sysctl or any specific parameter Post tuning how shall I clearly measure performance enhancement / degradation ?

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• Hosting provider that allows you to host your own VM image?

  - by Timo Geusch

  I've already looked at the 'Best Hosted VM Provider' question and checked the recommendations there, but I seem to have slightly odd requirements. Basically, I am looking for a host that allows me to host a VM image I supply (FreeBSD, which most of the suggested hosters don't support, they only seem to support various Linuxes) instead of one of their standard images. I'm a long time BSD user and have had colo BSD servers in the past so I'm pretty sure that i don't need much in the way of software support, but I'd basically like to run my server on managed hardware without having to rent the whole server. For the usage I have that would way OTT as we're talking a couple of small apps with very few users, a couple of blogs and (most importantly) email hosting for about 6-10 domains with moderate traffic levels. Oh, and reliability trumps cost to a certain extent.

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• Accessing through VPN, which internet connection would be used

  - by Sriram

  I've a data card which has a limit of 2 GB up/download traffic per month. I've an office internet line which has an unlimited up/download. I've successfully connected to VPN using my data card and by changing certain configurations like DNS etc., have also been able to use my office line for internet (verified by doing a IP check - returns the static IP of our office). Now to my question - is it just a NAT which is happening or am I actually using my office line for all communication. Which one would reflect the usage/trace. The data card usage log at this moment does not reflect any usage (which is confusing since the VPN is over the data card connection). Further more (theoretically), would the net be any faster if my office line is let us say 8Mbps and the data card is 512kbps by doing this as against directly connecting the internet using the data card.

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• salted passwords confusion

  - by Vasiliy Stavenko

  I'm setting up email server for the first time and confused with strange thing. I have several user accounts which stored in previous server. Passwords for this accounts are in plain text. But I want to create crypts for them. Mysql (where my users will be stored) have function encrypt(passwd, salt). If no salt given used random value. I discovered that courier uses one certain salt and crypted all passwords with it. So the task done. But I'd like to know if there's a way to define my own salt for my pop3 server?

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• IIS6 Permissions

  - by Gordon Carpenter-Thompson

  We have a set of IIS6 Jakarta/ASP.NET applications (implemented as virtual directories) on a machine without a domain. The directories all exist under the default website. We need to setup the permissions so that certain users can access only specific applications yet others users can access several of the applications. The way it's been setup previously has been to explicitly deny access to the users for every application except the ones that they are allowed to see. The problem is that the list of applications changes fairly often (for demos etc) and it's been known for the developers to forget to deny the old users access to the new applications which leads to security problems. This is all quite unmaintainable. Does anybody have any advice on this? Surely I can't be the only person to find this all a bit of a mess? Thanks

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• Macros Excel 2007 - extracting data

  - by Martin

  Im trying to extract certain data from a cell and trying to put it somewhere else within the same cell. Any suggestions? EDIT I have several text strings in ONE cell (a date, a part number and a color). The format looks like this 100906 PBO5 BLUE. The date is always the same number of characters but the part number could be 2, 3 or 4 characters. I want to move the date to the position after the color so it looks like this PBO5 BLUE 100906. I have over 1,000 records so I don’t want to do this manually.

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• Automatically wake up notebooks not on the ethernet

  - by gletscher

  I am looking for an automated backup system and I like bacula. I have 3 Notebooks and a Desktop computer that need regular backup. Now I don't want to let them run all night just to do the backuping, so I was thinking I could use wake-on-lan to have bacula wake up the machines, then do the backups, and shut them down afterswards. While this may work with devices on the ethernet, it won't work with the Notebooks on the wifi. So is it possible to have the Notebooks schedules to automatically wake up from suspend or shutdown ? Or is it possible to interject a shutdown command if it is after a certain hour and call the bacula director to start the backup now? I'm new to controlling the linux system using scripts, so any hints on how and where to start are greatly appreciated. Thanks alot for your help, input and ideas.

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• Physically moving a hard drive from older iMac (c2d) to new iMac (i7) ?

  - by Inshim

  Instead of my usual habit of using superduper to mirror my drive to a new computer, I just physically moved the hard drive from an older iMac to a new one. But... it now doesn't boot, getting stuck at the apple logo screen. Since the hard drive that came with the new iMac works well, and my old drive works well when I return it to the older iMac, I conclude that there is some problem at the system/kernel level due to the different hardware. In the past I did similar things (e.g. starting a C2D machine from a Core Duo in target disk mode), so perhaps the change in architecture to the i5/i7 is too problematic? The main point: do you know of any way to get the system to rebuild for itself the proper versions of the system components when booting? Are there certain directories that I can safely delete to make that happen? Thanks

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• Mails bounce because of invalid character ('@') in username

  - by user1598585

  I have a working exim setup with virtual users, working alright, except for when I try to send email to certain servers. These servers reject my emails because of #5.1.3 Invalid character ('@') in username. The offending header parts seem to be: Return-path: <"[email protected]"@smtp.example.com> and ...(envelope-from <"[email protected]"@smtp.example.com>)... The problem is that I cannot find where and why the usernames are being generated like this. My router for submission is: dnslookup: driver = dnslookup domains = ! +local_domains transport = remote_smtp ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 no_more And the respective transport: remote_smtp: driver = smtp What can be producing this problem?

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• Windows hangs on Rename, Delete and Move for specific MKV files

  - by Creativehavoc

  I have been googling this issue for a long time, and no full solutions seem to be out there. For certain mkv files, windows hangs when moving, copying, or deleting. These files play fine in a player such as GOM player. System: a fast windows 7, 64 bit box. Results: CPU change is negligible Memory usage rockets up to ~100% In cased of delete or move, "discovering files" dialogue box stays up for a long time Rename simply shows spinning icon until it finishes Action is completed after EXTREMELY long amount of time Memory usage does not return to normal "Fixes:" Disable thumbnail creation (helps for some cases) After move/rename/delete kill explorer with taskmanager, and relaunch to re-claim your memory Even with the thumbnails turned off, the issue persists. I have also tried re-muxing a file, which worked fine, but still resulted in a file with the same above issues.

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• Latency in TCP/IP-over-Ethernet networks

  - by aix

  What resources (books, Web pages etc) would you recommend that: explain the causes of latency in TCP/IP-over-Ethernet networks; mention tools for looking out for things that cause latency (e.g. certain entries in netstat -s); suggest ways to tweak the Linux TCP stack to reduce TCP latency (Nagle, socket buffers etc). The closest I am aware of is this document, but it's rather brief. Alternatively, you're welcome to answer the above questions directly. edit To be clear, the question isn't just about "abnormal" latency, but about latency in general. Additionally, it is specifically about TCP/IP-over-Ethernet and not about other protocols (even if they have better latency characteristics.)

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• Linux - Create ftp account with read/write access to only 1 folder

  - by Gublooo

  Hey guys.... I have never worked on linux and dont plan on working on it either - The only command I probably know is "ls" :) I am hosting my website on Eapps and use their cpanel to setup everything so never worked with linux. Now I have this one time case - where I need to provide access to a contractor to fix the CSS issues on my website. He basically needs FTP (read/write) access to certain folders. At a high level - this is my code structure /home/webadmin/example.com/html/images /css /js /login.php /facebook.php /home/webadmin/example.com/application/library /views /models /controllers /config /bootstrap.php /home/webadmin/example.com/cgi-bin I want the new user to be able to have access to only these folders /home/webadmin/example.com/html/js /home/webadmin/example.com/html/css /home/webadmin/example.com/application/views He should not be able to view even the content of other folders including files like bootstrap.php or login.php etc If any sys admins can help me set this account up - will really appreciate it. Thanks

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• Linux - Create ftp account with read/write access to only 1 folder

  - by Gublooo

  Hey guys.... I have never worked on linux and dont plan on working on it either - The only command I probably know is "ls" :) I am hosting my website on Eapps and use their cpanel to setup everything so never worked with linux. Now I have this one time case - where I need to provide access to a contractor to fix the CSS issues on my website. He basically needs FTP (read/write) access to certain folders. At a high level - this is my code structure /home/webadmin/example.com/html/images /css /js /login.php /facebook.php /home/webadmin/example.com/application/library /views /models /controllers /config /bootstrap.php /home/webadmin/example.com/cgi-bin I want the new user to be able to have access to only these folders /home/webadmin/example.com/html/js /home/webadmin/example.com/html/css /home/webadmin/example.com/application/views He should not be able to view even the content of other folders including files like bootstrap.php or login.php etc If any sys admins can help me set this account up - will really appreciate it. Thanks

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• Linux - Create ftp account with read/write access to only 1 folder

  - by Gublooo

  Hey guys.... I have never worked on linux and dont plan on working on it either - The only command I probably know is "ls" :) I am hosting my website on Eapps and use their cpanel to setup everything so never worked with linux. Now I have this one time case - where I need to provide access to a contractor to fix the CSS issues on my website. He basically needs FTP (read/write) access to certain folders. At a high level - this is my code structure /home/webadmin/example.com/html/images /css /js /login.php /facebook.php /home/webadmin/example.com/application/library /views /models /controllers /config /bootstrap.php /home/webadmin/example.com/cgi-bin I want the new user to be able to have access to only these folders /home/webadmin/example.com/html/js /home/webadmin/example.com/html/css /home/webadmin/example.com/application/views He should not be able to view even the content of other folders including files like bootstrap.php or login.php etc If any sys admins can help me set this account up - will really appreciate it. Thanks

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• URGENT: Need a Company to Fix My Plesk & IIS on windows 2008

  - by DevCompany

  Hello: I need to know a name of a company to fix my server install and get my sites running again. Windows 2008 IIS 7 Plesk 9.x The problem started when Level 2 of my hosting company adjusted a FTP users to have certain permissions....apparently he did this outside of plesk and it has been nothing but permission headaches all around. Connections....uploading files, etc. now somethings gone wrong where plesk isnt even loading properly and IIS too... I need to see if someone can fix this remotely before I give the green light to format and reinstall server, IIS, Plesk and Domains! looking to pay a company to get this working ASAP - This is not requested as a free job so I need someone good and who can fix it without the huge hassle of formatting and such. Need to resolve today Post expires on Monday 04-26-20010

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• Microsoft Word 2010 Header and Footer assistance

  - by CBP

  I am using Microsoft Word 2010 to format a book. I need different headers for different parts of the book. I have put them in different sections but my problem is when I click on Header to change or delete certain headers it changes the pages around in my document. For instance when I am looking at the page regularly the writing and section for page 20 is different then the writing and section when I am looking at it with the header and footer open. This is very frustrating because I can not properly change the headers. I hope this makes sense and somebody can explain what is going on and how to resolve this!

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• How do I give MacPorts privileges?

  - by cojadate

  I tried to install PostgreSQL server development libraries using MacPorts and got the following: Warning: MacPorts running without privileges. You may be unable to complete certain actions (e.g. install). ---> Computing dependencies for postgresql-server-devel ---> Dependencies to be installed: postgresql-devel ---> Building postgresql-devel Error: Target org.macports.build returned: shell command failed Error: The following dependencies failed to build: postgresql-devel Error: Status 1 encountered during processing. To report a bug, see <http://guide.macports.org/#project.tickets> So I guess that means I need to running MacPorts with privileges and try again. Unfortunately I've no idea how to give MacPorts privileges. I'm running OS X 10.6.3

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• Empty /var/log after running cron bash script

  - by Ortix92

  I wrote a little bash script and all of a sudden my /var/log folder is completely empty except for the log I created for the bash script. This is the script I'm running every hour with cron: #!/bin/bash STL_DIR=/path/to/some/folder/i/hid LOGFILE=/var/log/stl_upload.log now=`date` echo "----------Start of Transmission----------" 2>&1 | tee -a $LOGFILE echo "Starting transfer at $now" 2>&1 | tee -a $LOGFILE rsync -av -e ssh $STL_DIR [email protected]:/users/path/folder 2>&1 | tee -a $LOGFILE echo "----------End of transmission----------" 2>&1 | tee -a $LOGFILE printf "\n" 2>&1 | tee -a $LOGFILE I want to be clear that I'm not 100% certain this is related to the empty logs folder. So if anyone could give me a pointer as to what could be going on about the reason why my log folder is empty, that'd be great.

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• Need to setup a RADIUS server to authenticate a Windows client to a Windows server

  - by drosenblatt

  I have a server that I have technicians who need to be able to access using shared credentials. However, doing that violates our security policy (!). I need each user to be able to authenticate using their own credentials, but the server in question has to be logged in with a certain login (these two requirements are clearly diametrically opposed). I thought that this would be a great application for a RADIUS server. I know how to setup RADIUS to go from Windows -- Cisco, but I have no idea how to use RADIUS to authenticate Windows -- Windows. Can this be done? If so, how?

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• iptables rule to submit packets matching a specific negative rule

  - by Aditya Sehgal

  I am using netfilter_queue to pick up certain packets from the kernel and do some processing on them. To, the netfilter queue, I need all packets from a particular source except UDP packets with src port 2152 & dst port 2152. I try to add the iptable rule as iptables -A OUTPUT ! s 192.168.0.3 ! -p udp ! --sport 2905 ! --dport 2905 -j NFQUEUE --queue-num 0 iptables throw up an error of Invalid Argument. Querying dmesg, I see the following error print ip_tables: udp match: only valid for protocol 17 I have tried the following variation with the same error thrown. iptables -A OUTPUT ! s 192.168.0.3 ! -p udp --sport 2905 --dport 2905 -j NFQUEUE --queue-num 0 Can you please advise on the correct usage of the iptables command for my case.

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• Redirect or send mail in a script that runs in a rule on incoming mails in outlook 2010

  - by Guido Mertens

  I have the following problem: - I have a mails that are arriving in my mailbox - these mails contain a specific string in the body - what I want to do is: -- removing this string from the body -- then send this body to another mail adres (send, not forward) What have I already done: A. created a rule that activates the script in incoming messages that contain a certain string in the description This is the rule description: Apply to message with "Maileater" in the subject and on this computer only run "Project1.ChangeString" B. created the script with the following instructions: Public Sub ChangeString(MyMail As MailItem) Dim body As String body = MyMail.body body = Replace (body, "=====================================================", " ") MyMail.body = body MyMail.Save End Sub C. now I want to add in the script the instruction to send the body (or MyMail.body) to a specific mail adres (e.g. [email protected] with description "Support asked") after the replace of the string. is this possible? Can someone help me with this, I would be very greatfull because this will eliminate me from a lot of manual work. remark: this is just an exemple of a mail, the real thing will contain other replacements and mails to send

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• How do I apply WinHTTP proxy settings domain-wide?

  - by Oliver Salzburg

  We're already configuring Internet Explorer proxy settings through group policy and it works great. Sadly, I've recently run into multiple issues where those settings are ignored by certain services. I realized that these service have one thing in common. They use WinHTTP, which has its own proxy settings. Now I'm asking myself how to apply those across the whole domain. I realize that I could create a logon script and simply run netsh winhttp import proxy source=ie, but, from experience I know that these settings require a reboot to take effect. So this wouldn't help me at all in a logon script. So, how can I do it?

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• Disable the Taskbar in Windows 7

  - by ToastMan

  Hi all, I got Windows Server 2008 and Windows 7. We need to run an application on certain computers with very restricted access to other windows functions. Is there a way to disable the taskbar for client users on W7 computers? I looked in the Group Policies but it's not there. Also, I am aware of Taskbar Eliminator, but it doesn't remove the Start button which is not good for me. Any suggestions are very appreciated. Thank you. Toast

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• Which video types are considered secure/trusted by Windows Vista Media Center?

  - by Page Brooks

  I've been working to set up a Windows Vista Media Center and I noticed that when I play certain DVDs, the video is scrambled. After watching this video, I think it is because Windows Vista considers Component Cables to be untrusted and therefore scrambles the video. The video says that VGA is a trusted video type, but I was curious of which other types are trusted? If I were to use a DVI to HDMI cable, would that be trusted? Edit: Scrambled as in: The video looks like a rainbow checkerboard. The audio plays as expected. I'm using component cables for the connection to my TV.

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• How do I host multiple SSL websites on a single EC2 instance using Amazon Elastic Load Balancers?

  - by Developr

  If I have 3 separate websites which all require SSL (separate certificates) that I want to host on the same EC2 instance(s) across multiple availability zones so that we have the ability to scale and be highly available, how do I achieve this using ELBs in my Amazon VPC? Each site requires a separate IP address, so I have added multiple private IPs to the EC2 instance, but I am unsure how to bind the ELB to a certain IP on the instance. I was also able to setup multiple ELB pointing to the same instance, but again, I am not seeing any way to bind each ELB to a separate IP on the instance. If this is not possible, what is the best option? Run each site on a separate EC2 instance / ELB combo (expensive and harder to maintain) Give each site a separate public IP and use Route 53 to do the load balancing (seems like a hack) Use a different load balancer option such as HAProxy that should be able to work like a normal load balancer appliance. Please help!

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