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• What can impact the throughput rate at tcp or Os level?

  - by Jimm

  I am facing a problem, where running the same application on different servers, yields unexpected performance results. For example, running the application on a particular faster server (faster cpu, more memory), with no load, yields slower performance than running on a less powerful server on the same network. I am suspecting that either OS or TCP is causing the slowness on the faster server. I cannot use IPerf , unless i modify it, because the "performance" in my application is defined as Component A sends a message to Component B. Component B sends an ACK to component A and ONLY then Component A would send the next message. So it is different from what IPerf does, which to my knowledge, simply tries to push as many messages as possible. Is there a tool that can look at OS and TCP configuration and suggest the cause of slowness?

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• Time machine folders won't restore recursively

  - by Brian Postow

  I have a Snow Leopard system with Time Machine. Every so often I need to look at an old folder, so I go in and try to restore it, usually to a different location. What I end up with is an empty folder of the appropriate name. none of the files, nothing. It doesn't give any error messages. The files ARE there, because I can see them, also, if I go in via the mount point, and trace down through the file system, I can do a filecopy of the folder, and everything turns out fine. However, that seems like a bad idea. so, I'd like to know why he "right" way doesn't work... I believe that it used to work. It's also possible that it only doesn't work for certain folders. I haven't tested extensively.

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• My ubuntu server is losing connectivity, require assistance troubleshooting

  - by Coderama

  I have two server monitoring tools that check the uptime of my Ubuntu 10.04.1 LTS server. Over the last month both of these tools have reported the following outages: Jan - 15mins: self recovery Jan - 5 mins: self recovery Feb - 15mins: I managed to be online when this happened and logged into my control panel to find that my server was shutdown. I manually restarted it only because I was online. I wonder if it would have restarted? I have contacted my VPS provider (webbynode) who could not see any any problems with their VPS infrastructure for the February outage. I have also checked the following log files to see if there are any anomalies that could be the cause of the outages; I am unable to see anything related to the server shutdown (Feb) in these logs: /var/log/auth.log /var/log/apache2/error.log /var/log/syslog /var/log/kern.log /var/log/boot /var/log/messages Could anyone suggest any other things I should look out for, such as additional system logs? I just added bootlogging through /etc/default/bootlogd

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• NTP configuration not recognized?

  - by Eugene S

  I'm trying to configure NTP on my machine but it seems that the parameters I set are not being read by the system. Below is my /etc/ntp.conf file. (I applied the most basic configuration to eliminate other issues) server 10.45.68.47 server 127.0.0.1 After I set the above configuration, I restart the ntpd process by doing the following: service ntpd restart And then I get the following output: Shutting down ntpd: [ OK ] ntpd: Synchronizing with time server: [FAILED] Starting ntpd: [ OK ] Moreover, I can see the following in /var/etc/messages: Apr 2 10:54:07 hsystem1a ntpd[21067]: ntpd exiting on signal 15 Apr 2 10:54:07 hsystem1a ntpdate[21537]: can't find host ntpServer1 Apr 2 10:54:07 hsystem1a ntpdate[21537]: can't find host ntpServer2 Apr 2 10:54:07 hsystem1a ntpdate[21537]: no servers can be used, exiting So it seems that the ntpServer1 and the ntpServer2 are being read from somewhere instead of the IPs I configured in /etc/ntp.conf. NOTE: I done init 6 on the machine just in case. Thanks!

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• FTP Logs in IIS 7.5

  - by Jacob84

  I know this is weird, but the thruth is that I can't find the FTP logs in one IIS 7.5 Server. In the IIS Management Console, I've gone to the server, click on FTP Logging that appears inside FTP group (with other options like FTP Messages and FTP Request filtering). Seems that the configured folder for logs is: C:\InetPubFolder\logs\LogFiles If I go there, I can find a lot of folders with the structure W3SVC#, where # it's a number. They all contain logs, but they are HTTP logs, plenty of GET and POST verbs. Am I missing something? The server contains a lot of domains and It's hard to find.

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• scp -q isn't quiet between different hosts

  - by pythonic metaphor

  So scp -q file host:file and scp -q host:file file are both quiet, i.e. don't give the progress meter. But when I run scp -q host1:file host2:file, I still get the progress meter as well as a Connection to host1 closed. message. The progress meter can be gotten rid of by redirected stdout to /dev/null (although I'd rather not have to), but the connection closed messages comes on stderr, which I definitely want to keep in case there's a real error. How can I make scp quiet? Do I have to run ssh host1 "scp -q file host2:file"?

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• Access RAID configuration in x3550M2

  - by Mike B

  I'm trying to configure RAID in a IBM x3550 M2 server. I can't find any messages on boot about any hotkey to access the configuration utility. I wasn't able either in BIOS. The card is a on board LSI 1068e. I can't find the original CD's shipped with the server, but I downloaded Server Guide 9.21 from IBM web. Booted with that, and only getting stuck at "Windows loading"p. Tried with a 8.? version from a x3550 (M1), but it was less useful. Although I do not consider myself an expert, I'm starting to feel like a newbie luser. Any help?

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• monitoring TCP/IP performance on Solaris

  - by Andy Faibishenko

  I am trying to tune a high message traffic system running on Solaris. The architecture is a large number (600) of clients which connect via TCP to a big Solaris server and then send/receive relatively small messages (.5 to 1K payload) at high rates. The goal is to minimize the latency of each message processed. I suspect that the TCP stack of the server is getting overwhelmed by all the traffic. What are some commands/metrics that I can use to confirm this, and in case this is true, what is the best way to alleviate this bottleneck?

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• Why is Thunderbird saying I am working offline when Work Offline is not ticked?

  - by Dizzley

  Thunderbird says "You are currently offline. Do you want to go online to get new messages?" The menu item File-Work Offline is not checked. Is there another "offline" setting? Back story: I moved my Thunderbird profile from another user to my new account today following the instructions here. (it's down as I type). This may be a red herring. I have been sending and receiving happily in the last few hours since - so I remain confused. (Windows 7 Enterprise).

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• Windows 7 XPS Document Writer has stopped working

  - by jamie

  I have successfully used the Windows 7 XPS Document writer for quite a while under windows 7 (64 bit). Now however when i try to print i get prompted twice for the output file name and then get different error messages depending upon the application being used. e.g. Notepad gives a 'The I/O operation has been aborted because of either a thread exit or an application request'. I have disabled and reenabled the XPS facilities of windows features and have similiarly removed and readded the printer. But the end result is the same. I've uninstalled all applications i have installed since the time when i know it worked but this also has not made any difference. Suggestions please!

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• Dummy SMTP server as a service

  - by levidos

  Hello, I have a Windows Server 2008 machine with IIS installed which is hosting a webapp that is sending some notification mails once-in-a-while. What I'd like to do is to monitor the email sent by the application. For this I need a dummy SMTP server which intercepts messages but won't send them further but save them locally on the hard disk.I've already found some of them like Papercut, SMTP4Dev. The problem with these that I have to be logged on the server all the time which is not suitable because the server has only 2+1 TS connections. I like to run a program like these as a windows service and check the mails when I need them. Any suggestion is much appreciated. Best Regards,Levente Rog

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• How to execute a command on multiple hosts using IPv6 only?

  - by math

  First of all there is pdsh which is essentially a parallel distributed shell which may execute commands on a list of given hosts. However, I find myself in an IPv6 only problem setting. It seems that pdsh is not able to use IPv6, as I am getting error messages: pdsh -w ^hostnames my_command pdsh@myhost: gethostbyname("foobar") failed I also tried to use IPv6 addresses only, which also didn't work. So how do you run a single shell script for administrative purpose (no SGE stuff, or similar) on a bunch of hosts that is IPv6 reachable only?

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• managing openfire users and conversations from java application

  - by user1600405

  I need to control openfire users and conversations from my own java application, the number of users is more than 1000 , this is what I want to do exactly : Listening for new invitations to chat rooms and accept them automaticly ,listening for new messages for all users and listening for presence staus for all users . As well as I would like to send a new invitation to join a new chat room from specifics users ,send a new message from a user to a chat room and change the presence status of users . I don't know how I can do that , I tried Smack and it seems that I can only manage or control a single user. Any help is appreciated Thanks for your reponse .

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• Does my dd-wrt installation support firewall logging?

  - by SpikeX

  I would like to log firewall events. I know this is possible with dd-wrt, but a lot of the documentation I've read states that this isn't possible with a micro installation of dd-wrt (based on BusyBox). I have a Netgear WNDR3700v2 router, and it does have BusyBox installed on it, but I don't know if the dd-wrt build is a micro build or not. How can I find this out, or how can I find out if my router supports firewall logging or not? Currently, if I enable all firewall logging (setting everything to "Enabled" and/or "High" gives me back blank firewall logs - but syslogd is working because I can view other system log messages).

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• Where can I download Microsoft VC80.CRT version 8.0.50608.0 ?

  - by Leonel

  Hi, I've just installed Microsoft Office Home and Student 2007 in Windows XP SP3 When trying to run MS word or any other office app (Excel, PowerPoint), I get the following message: this application has failed to start because the application configuration is incorrect This also happens with other applications, for instance, Acrobat Reader. A bit of Googling around this error message suggests that this might be due to a mismatch of library versions. In fact, most of the articles and forum messages I found mention a programmer writing an application in Visual C++ and sending it to someone else, who then runs into that error. This is hardly my case ! I looked into Office's files and the manifest file for Excel suggests that Office is trying to use Microsoft VC80.CRT version 8.0.50608.0. However, in my Windows System folder, I can only find the assemblies for 8.0.50727.762 My next step will be trying to find version 8.0.50608.0. How can I find and download it ?

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• How to debug old initd script under systemd?

  - by Gene Vincent

  I have an older initd script to start my application. It worked fine under older versions of SuSE, but fails on Open SuSE 12.3. The strange thing is cd /etc/init.d ; ./script start works fine. /etc/init.d/script start shows a redirection to systemctl, but doesn't start my application (and also doesn't show any output from the initd script). I don't see any log entries showing me what goes wrong. The only entry I see is in /var/log/messages saying the application was started. How do I debug this ?

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• How do I run Munin plugins written in Ruby, using RVM?

  - by hlg

  Hi! I try to run some Munin plugins written in Ruby. I would like to use RVM, so Munin needs to know where to find Ruby. I tried to change the line calling munin-cron in the cron file as follows: */5 * * * * munin bash -c 'source /usr/local/lib/rvm && rvm 1.9.2@munin && /usr/bin/munin-cron' This leads to error messages in munin-node.log, saying /usr/bin/env: ruby: No such file or directory When I change the plugins' shebangs to the actual path of the Ruby executable it works, but the RVM environment should be set so that '/usr/bin/env ruby' works. It does when I execute the plugins as root. Any ideas?

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• Mail being sent as root on Ubuntu 14.04

  - by Benjamin Allison

  I'm really struggling with this. I'm trying to set up this server to send mail using Gmail's SMTP. Google keeps bouncing the messages, saying that that Authentication is required: smtp.gmail.com[74.125.196.109]:25: 530-5.5.1 Authentication Required. Learn more at smtp.gmail.com[74.125.196.109]:25: 530 5.5.1 http://support.google.com/mail/bin/answer.py?answer=14257 But it seems my server is trying to send mail as [email protected]. I'm baffled. Here's what I've done so far: Updated mail.cf relayhost = [smtp.gmail.com]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_tls_CAfile = /etc/postfix/cacert.pem smtp_use_tls = yes Created /etc/postfix/sasl_passwd: [smtp.gmail.com]:587 [email protected]:password Then did the following: sudo chmod 400 /etc/postfix/sasl_passwd sudo postmap /etc/postfix/sasl_passwd cat /etc/ssl/certs/Thawte_Premium_Server_CA.pem | sudo tee -a /etc/postfix/cacert.pem service postfix restart I can't for the life me get a mail message to send, or change the default mail user from [email protected] to [email protected] (FWIW, I'm using Google Apps, that's why it's not a .gmail address).

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• Window 2003 Server - Logon Failure error message in Event Viewer

  - by user45192

  Hi guys, I received alot of event logged in the event viewer with this message. I notice is always the same user id which encounters this error. The user id is use by an application to access the database. However, this account does not exits on this server. How do I trace the services/program use by this user id which causes these error messages? Reason=Unknown user name or bad password&&User Name=&&Domain=&&Logon Type=3&&Logon Process=NtLmSsp&&Authentication Package=NTLM&&Workstation Name=&&Caller User Name=-&&Caller Domain=-&&Caller Logon ID=-&&Caller Process ID=-&&Transited Services=-&&Source Network Address=-&&Source Port=-&&User=SYSTEM&&ComputerName=

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• rsyslog server - Can you split up and organize logs?

  - by Jakobud

  I recently setup one of our servers as an rsyslog server. I now have our firewall setup to log everything to that rsyslog server. But there doesn't seem to be an organization of the logs. All the firewall logs are just being dumped into the /var/log/messages on the rsyslog server. I guess I was maybe expecting them to at least be in a machine specific log file or directory. How can I organize the incoming logging? If I setup 20 servers to all log everything to a central rsyslog server, I really don't want everything being dumped into one big file or a few files. How can I setup rsyslog to tell it where to log what? Like if all the logs for a specific server were in it's own directory/file, etc... Is this possible?

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• Preferred method for allowing unprivileged UNIX/Linux users to view syslog information

  - by Joshua Hoblitt

  I have some non-privileged "role accounts" that need the ability to view [some of] the local syslogs (eg. /var/log/messages) for debugging purposes. This is explicitly local log data, not remote syslog, logstash, etc. Obviously, there's several ways to address this issue. What I'd like to know is if there is a fairly "standardized" way to solve this issue. Typically, I solve this problem with sudo but either POSIX groups or acls is attractive as it's few chars for the users to type and it removes entries from the sudo log. However, I don't believe I've ever seen that done before. What is your experience? How do large install base sites address this?

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• Will Hotmail DELIVER to spam-friendly ISP?

  - by Oddthinking

  I have a user who is using Hotmail to communicate with one of our suppliers. Recently, Hotmail started bouncing emails to that address (while other ISPs are working fine.) Hotmail bounce messages contain very little details. Investigating, I found that the supplier's ISP has appeared on a blacklist of ISPs who do not do enough to prevent spamming from their users. (Note: Neither my user nor the supplier are mass-mailing.) In the circumstances, I can understand Hotmail declining to accept emails from the host, or accepting them but being quick to mark them as spam. However, I am surprised that they might refuse delivery. Does this sound plausible to you, or am I barking up the wrong tree?

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• Logs being flooded from Squid for having intercepted and authentication enabled together

  - by Horace

  I have done some hefty Google'ing and I can't seem to find a single solution to this issue that I cam currently experiencing. Here is a sample configuration from squid that I have: # # DIGEST Auth # auth_param digest program /usr/sbin/digest_file_auth /etc/squid/digpass auth_param digest children 8 auth_param digest realm LHPROJECTS.LAN Network Proxy auth_param digest nonce_garbage_interval 10 minutes auth_param digest nonce_max_duration 45 minutes auth_param digest nonce_max_count 100 auth_param digest nonce_strictness on # Squid normally listens to port 3128 # Squid normally listens to port 3128 http_port 192.168.10.2:3128 transparent https_port 192.168.10.2:3128 intercept http_port 192.168.10.2:3130 As noted above, I have three ports defined, 2 of them are transparent/intercept and one is a regular http port (which I use for authentication). Which works rather well in this configuration however my logs are getting flooded of this entry authentication not applicable on intercepted requests whenever a transparent connection is made. So far, I can't seem to find any documentation that would describe how to suppress these messages ?

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• Unable to create a Windows 7 system image of a failing hard drive

  - by Rahul

  The hard disk of my one year old T400 Thinkpad has started failing periodic hardware tests. I get a "Targeted Read Test Failed" error. The "SMART short self test" times out. I am now trying to create a Windows 7 System image of the hard disk but it fails without giving any specific error messages. I tried using Comodo Backup but got an error (code 101117) there as well. I have copied the important files in Dropbox but would like to take a full System backup as I have plenty of software installed on the machine. Does anyone know why this is happening and how I can take a backup of the system image ?

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• is it okay to use random URLs instead of passwords?

  - by stew

  Is it considered "safe" to use URL constructed from random characters like this? http://example.com/EU3uc654/Photos I'd like to put some files/picture galleries on a webserver that are only to be accessed by a small group of users. My main concern is that the files should not get picked up by search-engines or curious power-users that poke around my site. I've set up an .htaccess file, just to notice that clicking on http://user:pass@url/ links doesn't work well with some browsers/email clients, prompting dialogs and warnings messages that confuse my not-too-computer-savy users.

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