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• SMTP Unreachable from Specific Networks

  - by Jason George

  I host my business site through a VPS account. The instance runs Ubuntu and I'm using POSTFIX+Dovecot as my mail server. For the most part, the mail server works fine. I have noticed, however, that I can not send mail from specific local networks. I noticed this at a client's office serval months ago. I can receive email, but any time I tried to send mail when connected to their network the connection would time out. Since I could send my mail after leaving, I chalked it up to improper network configuration and didn't worry about it. Unfortunately I've recently moved, switched service providers, and am forced to use the service providers router due to the special set-up they put in place to give me DSL in the sticks--well beyond the typical range for a DSL run. Now I'm unable to send email from home, which is a problem. I have tried sending email through my phone (using cellular service rather than my DSL) just to confirm the server is currently working. I'm not even sure where start debugging. Any ideas on how I might track down the issue would be greatly appreciated.

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• Cannot Delete Item "Could Not Find This Item" issue

  - by aronchick

  A friend sent a long a file (a .rar) he wanted me to check out for him before he installed it. I downloaded it and unrared it with no problems, but it was full of .exe's instead of the intended contents (fonts) so I advised him to delete it immediately and not use. I then proceeded to do the same, but the folder simply will not delete. Oddly the files went fine, and I never ran anything, but this is what I'm seeing: Could not find this item This is no longer located in C:\Users\This_User\Desktop. verify the item's location and try again. I've tried the following things with no help: Using "Unlocker" to Unlock and delete Using move on reboot and rebooting Using PendMoves (from sysinternals) and rebooting Elevating a cmd line, doing a dir /x to get the short name of the folder, and then del 'shortna~1' Moving the folder to a new folder and then trying to delete the parent folder I'm on Windows 7 RTM, very fresh install. Any thoughts? Update: Just to confirm, I've run Hijack this and half a dozen other malware detectors, and everything came back clean (no extra processes, no other obvious badness). Rebooting in safe mode didn't help either.

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• Configuring suExec to work with Apache and PHP via FastCGI

  - by RandomPsychology

  I have installed ISPConfig 3 on an Ubuntu VPS and configured it for Apache + PHP via FastCGI and suexec. I am able to upload PHP apps (e.g. Wordpress) and run them normally w/ suexec. However, for some reason the PHP scripts cannot write data to disk. For instance, trying to upgrade a plugin via Wordpress' web interface causes it to fail with the error "Could not create directory /path/to/wp-content/upgrade/plugin.tmp." Trying to upload media and other assets also fails via the web. I've checked owner/group on the directory structure and it looks good. The suExec log also seems to be normal and I don't see any indicative errors in the web server logs. I can also confirm that changing the owner/group on the directories does result in the expected error in suexec.log. Additionally, I have the directory permissions set to u=rw,g=r,o= and I've also tried setting g=rw. None of this results in my scripts being able to write to the directories. What am I doing wrong?

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• Domain authentication over OPEN wireless pre-logon (Windows 7 Pro) - No logon servers avail

  - by Shadow00Caster

  I have a plethora of laptops that are joined to an AD domain. I have an enterprise wireless system setup, the users of these laptops will be using an OPEN unsecured SSID which will ultimately have a captive portal that uses Radius-AD auth and firewall rules to allow access pre-captive portal auth to the proper ip's/ports of DC's etc for auth etc. I already have other laptops/users connecting to another SSID with 802.11x and SSO, all works perfectly pre-logon etc. My problem is with this open network, for some reason I cannot get the machines to auth to AD. The laptops connect to the wireless network, I confirm this on the controller and can ping the laptop at startup. I sharked the wires on the 2 DC's that these machines auth to, I can see a DNS SOA update from a laptop im testing with and can ping that test laptop from both DC's. When I try to logon, "There are currently no logon servers available to service the logon request." The shark shows no incoming connections to either DC even though the laptop is connected and pingable. Any help is greatly appreciated.

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• Why does the file date always change to the current date?

  - by Marshall

  We are a programming shop, but this i snot a programming question. My boss has put an external HD on the network. It contains the 'home' folders for users on the network. He uses it to place VB projects that he wants me to work on. But no matter what date and time he places a project on the drive, the file dates(modified) always shows the current date, though nothing in the files have changed. It makes it very hard to confirm that he has given me the latest versions. (He is not a fan of version control and nothing I do will convince him different.) Any ideas why this happens and how to prevent it from happening? P.S. As I wrote this I decided to add the last accessed date to the file display, and those dates happen to show the dates I expect to see. Why is the modified date getting changed, but not the accessed date. Does the accessed date change only when the files are opened or read, changed or not? Note: I use Directory Opus 9, a replacement for windows file browser. Thanks, Marshall

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• Setup of high-end web server and DB server cluster on Amazon EC2: Is this how it's done?

  - by user1086584

  Amazon is so technical, I want to confirm that my understanding is correct. We have a large 500 GB database. (OrientDB.) We will have it mirrored to one another in the same Availability Zone. We believe the database size will grow rapidly. The plan is: Get 4 large instances that are compatible types with Placement Groups (as well as ideally, Enhanced Networking) (2 for web, 2 for DB.) We use an EBS-backed instances to store our operating system. Discussion here: http://alestic.com/2012/01/ec2-ebs-boot-recommended We can set up ephemeral SSD instance storage as swap space. (But it is lost after even a reboot. I hear its hard to add ephemeral storage if booting from EBS, but possible.) For offsite backup, we will take periodic snapshots and store them on S3. Obviously we need to ensure the database is in a safe state when that snapshot happens to avoid corruption. (Any hints here, aside from shutting down the DB?) If the database gets too big, we need to create a EBS volume that's larger. We can use RAID to break the 1 TB limit: http://alestic.com/2009/06/ec2-ebs-raid Static assets on web servers will be stored on S3. Is that correct? Or am I missing something?

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• Accidentally deleting all OSX users using dscl

  - by gutch

  OK, so I just did something really stupid and deleted all the user accounts on an OSX 10.6.6 machine by running this: sudo dscl . -delete /users What I actually wanted to do was delete a single, troublesome account using a command like this: sudo dscl . -delete /users/localadmin ...but I absent-mindedly pressed return too early and deleted the lot. I've tried using -list and can confirm that I have indeed wiped all the accounts. The machine is currently running fine, but I'm sure that once I log out / reboot then it will be completely broken. I don't mind that I've deleted the normal user accounts (there was only one I wanted anyway). But it's surely going to be a big problem that system accounts like _installer and _jabber and _lda and _windowserver etc etc are gone. So my question is, how can I restore the standard set of system accounts? Do I have to reinstall OSX from scratch? Or can I either: undelete those system accounts, or run some command to recreate the system accounts?

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• How to auto-cc a system email account any time a user creates an appointment

  - by Ferdy

  I will not bother explaining my full architecture or reasons for wanting this in order to keep this question short: Is it possible to auto-cc a certain email account any time a Exchange user creates an appointment or meeting in his own calendar? Is it possible using rules? Our Exchange 2007 server is outsourced, I cannot change the configuration or install plugins server-side Preferably, it still should work server-side, because users may use the Outlook client but also Outlook Web Access Is there any other way, perhaps using group policies? My conclusion so far is that the only viable way to accomplish this is to build an Outlook add-on. The problem there is that it will need to be managed for thousands of desktop users and that the add-on will not work when using another client (OWA, mobile). An alternative architecture could be to pull the information from the user's calendar on a scheduled basis. Given that we are talking about a lot of users, scalability is a major issue, this has also been confirmed by Microsoft. Can you confirm that my thinking is correct or do you have any other solutions?

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• Determine the time difference between two linux servers

  - by Paul

  I am troubleshooting a latency network issue on a network. It is probably a nic or cabling issue, but while I was going through the process of figuring it out, I was looking at the timings of a ping packet leaving a network card and arriving at another server. Both linux. So I have tcpdump running on both, and I issue a ping from one to the other, and back again, and looking at the timing differences might have shed light on where the latency is coming from. It is an academic exercise now, as I need to eliminate some more fundamental causes, but I was curious as to how this could be achieved. Given that ntpd is installed and running on two servers, how can I confirm the current time discrepency between the two servers, to whatever level of accuracy is possible - given that we are talking about latency on a local lan, which is ideally a millisecond or so. NTP itself is accurate to a couple of ms under good conditions, and as both servers are in the same environment, they should (presumably) achieve a similar level of accuracy, and so should have a time discrepency between them of a only few ms - but how can I check this?

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• Unable to access stackexchange sites from this system

  - by Sandeepan Nath

  Earlier, I was not able to access most of the stackexchange sites like stackoverflow, programmers.SE etc. on my home Windows XP system. I was able to access only a few like http://meta.stackexchange.com and not even http://www.meta.stackexchange.com (note the www). I tried many other sites like http://www.stackoverflow.com, http://area51.stackexchange.com/ but was getting page not found errors on all browsers. Even pinging from terminal was saying destination host unreachable. I did not check recently but may be all SE sites are unreachable now. I was clueless about what could be the issue. I thought some firewall issue? So, I stopped AVG antivirus's firewall, then completely uninstalled it and even turned of windows firewall. But still not reachable even after fresh installation of Windows 7. Then I noticed a "Too many requests" notice on google. This page - http://www.google.co.in/sorry/?continue=http://www.google.co.in/# I don't know why this appeared but I guess somehow too many requests might have been sent to these sites and they blocked me. But in that case, SE would be smart enough to show a captcha like google. So, how to confirm the problem and fix it. Similar questions like these don't look solved yet - Unable to access certain websites Unable to Access Certain Websites I have lately started actively participating in lots of SE sites. There are new new questions popping up in my mind every time and I am not able to ask them. Please help! Thanks

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• Windows typeperf and pound signs.

  - by Weegee

  I'm currently trying to use typeperf to access some Windows performance counters. Unfortunately, a few of the instances I'm trying to check are of the format service#1. The command typeperf "\\server\Process(service#1)\Working Set Peak" is unfortunately returning the data for \\server\Process(service)\Working Set Peak rather than the data for the instance service#1. This holds true for any of the services that have pound signs in the counter string. Does anyone know of a method to get around this problem? Sample output: I:\>typeperf -s server "\Process(service#1)\Working Set" "(PDH-CSV 4.0)","\\server\Process(service)\Working Set" "10/08/2009 09:37:29.070","1643274240.000000" "10/08/2009 09:37:30.070","1643274240.000000" "10/08/2009 09:37:31.070","1643274240.000000" The command completed successfully. I:\>typeperf -s server "\Process(service#2)\Working Set" "(PDH-CSV 4.0)","\\server\Process(service)\Working Set" "10/08/2009 09:37:39.273","1643274240.000000" "10/08/2009 09:37:40.273","1643274240.000000" "10/08/2009 09:37:41.273","1643274240.000000" "10/08/2009 09:37:42.273","1643274240.000000" "10/08/2009 09:37:43.273","1643274240.000000" The command completed successfully. I can confirm in PerfMon that the Working Set value "1643274240.000000" is incorrect for both service#1 and service#2. I am running Windows XP Service Pack 2, but a co-worker who is running Windows Server 2003 was having the same troubles.

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• DMG mounting warning message says "it may make computer less secure or cause other problems"

  - by Cawas

  When I try to open a DMG file I get this: I'll just transcript the image: There may be a problem with this disk image. Are you sure you want to open it? Opening this disk image may make your computer less secure or cause other problems. What does that mean in fact? What's really wrong with it, and what kind of problem can it cause just by mounting? Someone said: When you download a file in Leopard (and Snow Leopard), it's marked as a quarantined file. This occurs by the OS adding an attribute to the file, tagging where it came from (such as "downloaded by Safari"). This is what causes the user to see prompts when running files that were downloaded from the Internet, you may remember being asked to confirm you'd like to launch program XXX downloaded by Safari on XXX date. As a new part of Snow Leopard, files which are tagged with the quarantine attribute also have integrity checked by fsck, and if that verify fails you will see the message you described, triggered by an unused node in the disc image. But really, I didn't get that. What's quarantine? I've just downloaded a file here on SL, tried to open, and got that warning. Apple have a say about quarantine files, and they seem to work the same on Leopards. Plus I have got that file using Google Chrome while that feature seems to work just with Safari.

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• Question about domain name registration

  - by Obay

  I received the following email from a certain [email protected] YYY is a company name ZZZ is OUR company name Dear Manager, We are a professional intellectual property rights consultant organization, mainly deal with the global domain name registration and internet intellectual property rights protection. On March. 24th, 2010, we formally received an application from YYY, they applied to register the internet brand “ZZZ” and some relevant domain names with our organization. During our preliminary investigation, we found that these domain names' keyword is fully identical with your trademark. Therefore, we need to confirm with you, whether you consigned YYY to register these domain names with us or not? Or, is YYY your business partner or distributor? If you have no relationship with this company, we assume that they have other purposes to obtain these domain names. Currently, we have already suspended this company's application temporarily due to the seriousness of this isuue. In order to avoid the vicious domain name grabbing, please let the relevant person make a confirmation with me via telephone or email as soon as possible. Thank you for your support to our work! Best Regards XXX Tel: xxxxx-xxxx xxxx Fax: xxxxx-xxxx xxxx Email: [email protected] www.world-wtc.cn This seems legit, or is it? By the way, XXX is just a first name, not a complete name.

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• SORT empties my file?

  - by Jonathan Sampson

  I'm attempting to sort a csv on my machine, but I seem to be erasing the contents each time I use the sort command. I've basically created a copy of my csv lacking the first row: sed '1d' original.csv > newcopy.csv To confirm that my new copy exists lacking the first row I can check with head: head 1 newcopy.csv Sure enough, it finds my file and shows me the original second now (now first row). My csv consists of numerous values seperated by commas: Jonathan Sampson,,,,[email protected],,,GA,United States,, Jane Doe,Mrs,,,[email protected],,,FL,United States,32501, As indicated above, some fields are empty. I want to sort based upon the email address field, which is either 4, or 5 - depending on whether the sort command uses a zero-based index. So I'm trying the following: sort -t, +4 -5 newcopy.csv > newcopy.csv So I'm using -t, to indicate that my fields are terminated by the comma, rather than a space. I'm not sure if +4 -5 actually sorts on the email field or not - I could use some help here. And then newcopy.csv > newcopy.csv to overwrite the original file with new sort results. After I do this, if I try to read in the first line: head 1 newcopy.csv I get the following error: head: cannot open `1' for reading: No such file or directory == newcopy.csv <== Sure enough, if I check my directory the file is now empty, and 0 bytes.

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• cygwin sshd fails to allocate pty for some users

  - by user115851

  I have (finally) got sshd working under cygwin on Win7 - well, sort of. The sshd runs as user 'cyg_server'. I'm able to successfully ssh to my computer using that same user name. However, if I attempt to ssh using my normal (Windows) user name, it fails trying to allocate a pty for my login session. For example, output of 'sshd -D -d -d -d' contains this .. ... debug1: Entering interactive session for SSH2. debug2: fd 4 setting O_NONBLOCK debug2: fd 5 setting O_NONBLOCK debug1: server_init_dispatch_20 debug1: server_input_channel_open: ctype session rchan 0 win 1048576 max 16384 debug1: input_session_request debug1: channel 0: new [server-session] debug2: session_new: allocate (allocated 0 max 10) debug3: session_unused: session id 0 unused debug1: session_new: session 0 debug1: session_open: channel 0 debug1: session_open: session 0: link with channel 0 debug1: server_input_channel_open: confirm session debug1: server_input_global_request: rtype [email protected] want_reply 0 debug1: server_input_channel_req: channel 0 request pty-req reply 1 debug1: session_by_channel: session 0 channel 0 debug1: session_input_channel_req: session 0 req pty-req debug1: Allocating pty. debug1: session_pty_req: session 0 alloc /dev/pty1 !!! chown(/dev/pty1, 17308, 10513) failed: Invalid argument debug1: do_cleanup debug1: session_pty_cleanup: session 0 release /dev/pty1 Currently /dev is owned by my normal account. I've tried changing its ownership to cyg_server as well as SYSTEM. In both cases the problem persists. I've also changed permissions for /dev (e.g, 700 and 777) - again problem persists. [As a side note - it is strange that whenever I do 'ls -al /dev' the ptys do not show up. However, if I 'ls -l /dev/ptyX' for a pty I know to exist, it shows up. Is that normal for cygwin?] -Bob Andover, MA

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• Understanding mail failure notices, 554

  - by goran

  I'd like to confirm the meaining of a mail failure notice. Here's the message Hi. This is the qmail-send program at mydomain.com I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <[email protected]>: 1.2.3.4 does not like recipient. Remote host said: 554 <[email protected]>: Relay access denied Giving up on 1.2.3.4 The way I understand this is, that 1.2.3.4 is not setup to receive mail for this domain. dig domain.com MX shows ;; ANSWER SECTION: domain.com. 6245 IN MX 10 mail.domain.com. domain.com. 6245 IN MX 20 mx.anotherdomain.com. (1.2.3.4 is mx.anotherdomain.com.). The puzzling part is that I have reports that messages sent from gmail get delivered to this address. P.S. Is this a proper question for serverfault?

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• DNS zone file SPF configuration to support sending mail from multiple servers and gmail

  - by Tauren

  I want to configure SPF on a domain to allow mail to be sent from: the x.com website server (x.com and www.x.com - both at same IP) it's MX servers (smtp.x.com, mx.x.com, mail.x.com) another server that isn't listed as an MX server (somehost.x.com) via gmail using an account that has authenticated use of [email protected] Will this zone file work? If not, what are the problems with it? $ttl 38400 @ IN SOA ns1.x.com. hostmaster.x.com. ( 201003092 ; serial 8H ; refresh 15M ; retry 1W ; expire 1H ) ; minimum @ NS ns1.x.com. @ NS ns2.x.com. @ MX 10 mx.x.com. @ MX 20 smtp.x.com. @ MX 30 mailhost.x.com. ; SPF records @ IN TXT "v=spf1 a mx a:somehost.x.com include:_spf.google.com ~all" mx IN TXT "v=spf1 a -all" smtp IN TXT "v=spf1 a -all" mailhost IN TXT "v=spf1 a -all" Questions: Is _spf.google.com the right thing to include for gmail.com, or is it only for Google Hosted Apps? If only for Google Apps, what should I include to send from gmail.com? If mail shouldn't be sent from anywhere else, is it safe to use -all instead of ~all? Does it make sense to add specific SPF records for each of the mail servers? Any other problems with the zone file? I want to confirm these things before making changes to my zone file. The file has SPF configured basically the same now, just without google.com and somehost, but I want to make sure I won't break things when I change it.

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• Apache httpd LDAP integration

  - by David W.

  I am configuring a CollabNet Subversion integration. I have the following collabnet_subversion.conf file: <Location /svn> DAV svn SVNParentPath /mnt/svn/new_repos SVNListParentPath on AuthName "VegiBanc Source Repository" AuthType basic AuthzLDAPAuthoritative off AuthBasicProvider ldap AuthLDAPURL ldap://ldap.vegibanc.com/dc=vegibanc,dc=com?sAMAccountName" NONE AuthLDAPBindDN "CN=SVN-Admin,OU=Service Accounts,OU=VegiBanc Users,OU=vegibanc,DC=vegibanc,DC=com" AuthLDAPBindPassword "swordfish" </Location> This works great. Any user in our Active Directory can access our Subversion repository. Now, I want to limit this to only people in the Active Directory group Development: <Location /svn> DAV svn SVNParentPath /mnt/svn/new_repos SVNListParentPath on AuthName "VegiBanc Source Repository" AuthType basic AuthzLDAPAuthoritative off AuthBasicProvider ldap AuthLDAPURL ldap://ldap.vegibanc.com/dc=vegibanc,dc=com?sAMAccountName" NONE AuthLDAPBindDN "CN=SVN-Admin,OU=Service Accounts,OU=VegiBanc Users,OU=VegiBanc,DC=vegibanc,DC=com" AuthLDAPBindPassword "swordfish" Require ldap-group CN=Development OU=Security Groups OU=VegiBanc, dc=vegibanc, dc=com </Location> I added Require ldap-group, but now no one can log in. I have LogLevel set to debug, but all I get is this in my error_log (Single line broken up for easier reading): [Thu Oct 11 13:09:28 2012] [info] [client 10.55.9.45] [6752] vauth_ldap authenticate: user dweintraub authentication failed; URI /svn/ [ldap_search_ext_s() for user failed][Bad search filter] And, I get this in my access_log: 10.55.9.45 - - [11/Oct/2012:13:09:27 -0500] "GET /svn/ HTTP/1.1" 401 401 10.55.9.45 - dweintraub [11/Oct/2012:13:09:28 -0500] "GET /svn/ HTTP/1.1" 500 535 Yes, I am in that group. (Or, at least how can I confirm that just to make sure that's not the issue. I have the SysinternalsSuite ADExplorer. It's where I'm getting all of my info.)

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• How to monitor changes in the frequency of network latency spikes over time?

  - by dequis

  I'm currently trying to troubleshoot an issue with my network in which I get latency spikes up to 200 seconds (normally around 50 secs) in an apparently random way at apparently random moments of the day. While trying to find what part of my messy network needs to be blamed (outside of the scope of this question - discussed a bit on chat), I realized I have no reliable way to confirm that a change actually improved anything. So far, the main way in which i notice this is that irssi shows [Lag: 15 (??)] in the statusbar, increasing every 5 seconds, and all other connections seem to be affected too. Since this depends on my observations, it's not a very reliable method to know how often it really happens. Note that just sending ICMP pings is probably not enough, but that's just my guess. It might be a "bufferbloat" issue, it might be packet loss, it might only apply to persistent connections. I suspect this because a few months ago, when the issue started, I had a "ping" command running in background and it didn't show anything weird at all during the latency spikes. This seems to have changed now (pings don't go through), but still, I'd prefer something more robust.

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• Checkpoint VPN-1 R60 and Windows 7 64 Bit Client

  - by Mohit

  As per my knowledge of checkpoint VPN-1. My company is using checkpoint VPN-1 R 60 ( I guess as I dont know how to check server version) Firewall(VPN Server). Now the problem is that I installed Windows 7 64 bit. But, after my research I found that there are not even one client (SecuRemote/SecuClient) for Win7 64 bit, when Firewall or server is R60. I thought of some open source solutions. Can you guys please suggest me some with the configuration required. As of now, I know the IP of the server. I know my username and password using which I connect and that is not my domain password. that i can confirm to you guys. I am not a network guy. I am more of a developer. But, I need some help in this.So, let me know if I can provide you more details. Please please i need urgent help on this.

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• Windows 7 network performance tuning for LAN

  - by Hubert Kario

  I want to tune Windows 7 TCP stack for speed in a LAN environment. Bit of background info: I've got a Citrix XenServer set up with Windows 2008R2, Windows 7 and Debian Lenny with Citrix kernel, Windows machines have Tools installed the iperf server process is running on different host, also Debian Lenny. The servers are otherwise idle, tests were repeated few times to confirm results. While testing with iperf 2008R2 can achieve around 600-700Mbps with no tuning what so ever but I can't find any guide or set of parameters that will make Windows 7 achieve anything over 150Mbps with no change in TCP window size using -w parameter to iperf. I tried using netsh autotuining to disabled, experimental, normal and highlyrestricted - no change. Changing congestionprovider doesn't do anything, just as rss and chimney. Setting all the available settings to same values as on Windows 2008R2 host doesn't help. To summarize: Windows 2008R2 default settings: 600-700Mbps Debian, default settings: 600Mbps Windows 7 default settings: 120Mbps Windows 7 default, iperf -w 65536: 400-500Mbps While the missing 400Mbps in performance I blame on crappy Realtek NIC in the XenServer host (I can do ~980Mbps from my laptop to the iperf server) it doesn't explain why Windows 7 can't achieve good performance without manually tuning window size at the application level. So, how to tune Windows 7?

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• Why a 10 years old software still is so slow even today?

  - by Cawas

  I just noted this question due to a game (which happens to be Diablo 2), but the matter of fact is: why is my brand new mac book pro, made in 2009 with latest technology (tho it's the cheapest one) can't rival my computer which used to run this much faster back in 2000? Really, it was much faster on my AMD K6 450 back in those days, and I could even run two clients at same time with no slow down. I've always had the feeling this machine was slow, but this is a very odd way to attest it. Granted, the machine is smaller, runs on wifi and "boots" way faster thanks to sleep mode. But other than that, what have we evolved after all?! I'm pretty sure this shouldn't be graphical card's fault. Sure if I buy latest technology it will run fast, and probably most people here can confirm this and won't even understand my question. But the thing is, all the hardware is supposedly much faster and better than the stuff from 10 years ago. The software and operating system became more complex, but also more well refined. Now I'm trying a piece of software that is actually 10 years old and it's not getting any better results! Why?

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• Can I have 2Gbit over 1Gbit Nics

  - by Daniel

  So this really baffles me. Apparently because 1Gbit can transmit data in both directions simultaneously it should be possible to get 2Gbit of data transfer on a single NIC (1Gbit flow seend and 1Gbit receive). People claim that because 1Gbit is full-duplex (almost always) it is exactly 2Gbit in total. My intuition and electrical background tells me that something is not right here 4 twisted pairs 250Mbit capacity each gives 1Gbit. Unless it is really possible to transfer data in both directions simultaneously. I did a test with iperf. Ubuntu server 12.04 <-- MacBook Pro. Both with decent CPU speed. Tested speed of connection individually and on Mac I can see 112MB/s regardless which direction data is going. On Ubuntu with vnstat and ifstat I got 970Mbit speeds. Now, launching iperf in server mode on both machines at the same time and sending data using 2 iperf clients shows that I'm for example on Ubuntu box sending at 600Mbit, and receiving 350Mbit. which adds up to pretty much 1Gbit link. So to me there is no magical 2Gbit. Can someone confirm that or tell why I'm wrong? Another thing that confuses me i the fact that e.g. 24-port switch has for example: Throughput»up»to:»50.6Mpps Switching»capacity:»68Gbps Switch»fabric»speed:»88Gbps Which would suggest thay can handle 2GBit per port.

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• Problem posting multipart form data using Apache with mod_proxy to a mongrel instance

  - by Ryan E

  I am attempting to simulate my site's production environment as closely as I can on my local machine. This is a rails site that uses Apache w/ mod_proxy to forward requests to a mongrel cluster. On my Mac OSX Leopard machine, I have the default install of apache running and have configured a vhost to use mod_proxy to to forward requests to a local running mongrel instance on port 3000. <Proxy balancer://mongrel_cluster-development> BalancerMember http://127.0.0.1:3000 </Proxy> For the most part, this is working fine. I can browse my development site using the ServerName of the vhost I configured and can confirm that requests are being properly forwarded to the mongrel instance. However, there is a page on the site that has a multipart form that is used to upload an image to the server. When I post this form, there is a delay of about 5 minutes and the browser ultimately returns a Bad Request Your browser sent a request that this server could not understand. In the error log for my vhost: [Tue Sep 22 09:47:57 2009] [error] (70007)The timeout specified has expired: proxy: prefetch request body failed to 127.0.0.1:3000 (127.0.0.1) from ::1 () This same form works fine if I browse directly to the mongrel instance (http://127.0.0.1:3000). Anybody have any idea what the problem might be and how to fix it? If there is any important information that I neglected to include, post a comment, and I can add to this question. Note: Upon further investigation, this appears to be a problem specific to Safari. The form works fine in Firefox.

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• Hard drive had reallocated sectors...but now it magically doesn't! Can I trust it?

  - by rob

  Last week my SMART diagnostics utility, CrystalDiskInfo, reported that the external hard drive that I was saving my backups to had suddenly reported 900+ reallocated sectors. I double-checked to confirm, then ordered a replacement drive. I spent all of this week copying data from that drive to the new drive. But toward the end of the copy, something peculiar happened. CrystalDiskInfo popped up an alert that the reallocated sector count had gone back down to 0. I know that when SMART detects a read error on a block, it adds that block to the current pending reallocation list. If it subsequently is successfully written or read later, it is removed from the list and assumed to be fine, but if a subsequent write fails, it is marked bad and added to the reallocated sector count. What concerns me most is that I've never read anywhere that a sector can be recovered as "good" after it has been marked as a bad sector and remapped. I've just finished running an extended SMART diagnostic, and it found no surface errors. Now I'm doubtful that the manufacturer will honor a warranty claim if the SMART info does not report any problems. Has anyone had this happen? If so, then is the drive, indeed, okay, or should I be concerned about an imminent failure?

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