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  • Joining Samba to Active Directory with local user authentication

    - by Ansel Pol
    I apologise that this is somewhat incoherent, but hopefully someone will be able to make enough sense of this to understand what I'm trying to achieve and provide pointers. I have a machine with two network interfaces connected to two different networks (one of which it's providing several other services for, such as DNS), running two separate instances of Samba, one bound to each interface. One of the instances is just a workgroup-style setup using share-level authentication, which is all working fine. The problem is that I'm looking to join the other instance to an MS Active Directory domain (provided by MS Windows Small Business Server 2003) to enable a subset of the domain users to access the shares from Windows machines on the other network. The users who need access from the domain environment have accounts (whose names are all-lowercase versions of their domain usernames) on the machine running Samba, but I'm not sure about how to map the UIDs and everything I've read concerns authenticating accounts on that machine against either AD or another LDAP server. To clarify: I only want the credentials for AD users accessing the non-workgroup Samba instance to be authenticated against AD, not the accounts on the machine running Samba. I hope this is sufficiently clear. EDIT: In addition to being able to access the Samba shares from AD, I do also need to be able to access a share on the domain from the machine running Samba but would still like everything non-Samba-related to authenticate locally.

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  • Can Subject Alternative Name accommodate multiple virtual mail domains?

    - by Lawrence
    I am currently running a postfix server with self signed certificates serving one mail domain, mycompany.com, the mail server is mail.mycompany.com and so is the CN of the certificate. Now, I need to add a new domain to it. The new domain name is mycompany.net to the same server. Since the users already have the root of the old certificate, I'd like to reuse that. However, I'd like to issue a new certificate so users using the SMTP from Outlook/Thunderbird of mail.mycompany.net do not get warnings. If I understand correctly, if I issue a new certificate with CN=mail.mycompany.com and a subjectAltName=DNS:mail.mydomain.net and have postfix serve this, the client will not complain either way about the cn not matching the target host name. Am I correct in this assumption or am I misunderstanding the concept of Subject Alternative Name? Just to avoid conversation, I do not want to have users on mycompany.net addresses use the mycompany.com server because I might (not a technical issue) have to split up into two different locations, and I want to produce an easily migrateable setup.

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  • Set postfix to send email but not to receive them

    - by CodeShining
    I'm using Google Apps to handle personal email addresses for my domain name, and I set up the DNS as Google suggests. All works fine. Now since I need a SMTP to send emails from my e-commerce I installed Postfix on the server. It works fine when I send emails to any email address but it doesn't send to the same domain name, so let's say my domain is example.com, I set postfix using example.com, if I try to reset a password using [email protected] postfix doesn't send and instead reports on the mail.log Sep 20 01:09:52 ip-10-54-26-162 postfix/pickup[6809]: B09A3415D8: uid=33 from=<www-data> Sep 20 01:09:52 ip-10-54-26-162 postfix/cleanup[6854]: B09A3415D8: message-id=<20120920010952.B09A3415D8@ip-10-54-26-162.eu-west-1.compute.internal> Sep 20 01:09:52 ip-10-54-26-162 postfix/qmgr[30978]: B09A3415D8: from=<[email protected]>, size=4234, nrcpt=1 (queue active) Sep 20 01:09:52 ip-10-54-26-162 postfix/local[6856]: B09A3415D8: to=<[email protected]>, relay=local, delay=0.01, delays=0.01/0/0/0, dsn=5.1.1, status=bounced (unknown user: "myaccount") Of course it cannot find a local user "myaccount" since that account is on Google Apps... How can I tell Postfix to send the email and do not search for a local user?

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  • postfix smtp_fallback_relay for deferred messages to a single domain

    - by EdwardTeach
    I use Postfix to send messages to a mail server outside my organization which frequently rejects/defers my mail. My Postfix server sees that these messages are deferred and tries again, eventually getting through. Final delivery can take up to an hour, which makes my users unhappy. In comparison, mail from my Postfix server to other hosts works normally. I have now found out about a second, unofficial MX for this domain that does not reject/defer mail. This second MX does not appear when doing a DNS MX query for the domain. Therefore, for the problem domain I would like to use this second MX as a fallback. That is: whenever mail is deferred by the primary MX, try again on the unofficial second MX. I see that there is already a postfix configuration "smtp_fallback_relay". However the documentation seems to indicate that I can not restrict usage of the fallback to a single domain. The documentation also doesn't mention deferred message handling. So is there a way to configure a single-domain, deferred-retry fallback host in Postfix? For reference, I am including my postconf output (the host names and ip addresses are fake): alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/etc/postfix/legacy_mailman, ldap:/etc/postfix/ldap-aliases.cf append_dot_mydomain = no biff = no config_directory = /etc/postfix default_destination_concurrency_limit = 2 inet_interfaces = all inet_protocols = all local_destination_concurrency_limit = 2 local_recipient_maps = $alias_maps mailbox_size_limit = 0 mydestination = myhost.my.network, localhost.my.network, localhost, my.network myhostname = myhost.my.network mynetworks = 127.0.0.0/8, [::ffff:127.0.0.0]/104, [::1]/128, 10.10.10.0/24 myorigin = my.network readme_directory = no recipient_delimiter = + relay_domains = $mydestination relayhost = smtp_fallback_relay = the.problem.host smtp_header_checks = smtpd_banner = $myhostname ESMTP $mail_name virtual_alias_maps = hash:/etc/postfix/virtual

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  • need advice on data center move, communication with both facilities during transition

    - by Brian Roden
    We are beginning the process of moving to a new facility. Office and warehouse operations will both be moving, and we must get shipping operations up and running at the new location while continuing to ship from the old location. Our contract with some third-party warehouse tenants requires two business day turnaround (only weekends and holidays excluded), so we can't have major downtime during the move. We would like to keep our 172.16.60/61.xxx internal address space in use throughout the move. Is it possible to keep using this same internal range, and have our existing WatchGuard Firebox 520 and whatever router we get for the other location (preferably the same model) just treat both locations as one network, leaving our host IPs the same throughout the move? Renumbering the servers when they move isn't a big deal, but our wireless terminals for order picking in the warehouse have fixed IPs (and a fixed IP, non-DNS reference to the host they speak with) and would be a massive undertaking to reconfigure when the servers move (each device would have to be reconfigured at least 2 times -- some when we start using them in the new building and the host is still here, all of them in both locations when the host moves to the new building, and the rest when they finally make the move to the new building). We're trying to avoid that if possible.

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  • Simple Linux program that takes any HTTP/HTTPS request and returns a single page?

    - by ultrasawblade
    I have a Linux box operating as router. There's a NIC that's connected to the internet (WAN), a NIC connected to an 8-port GbE switch (LAN), and a NIC connected to a Linksys wireless N-router (WLAN). Routing between everything is working perfectly. I have security completely disabled on the wireless router, but the WLAN NIC is firewalled such that it will only accept DNS queries and PPTP VPN connections. Currently HTTP/HTTPS traffic and everything else is blocked. I would like to run something that listens on port 80/443 of the WLAN NIC, and, for non VPN'ed connections, given any HTTP/HTTPS request it will return a single webpage saying "Unauthenticated" and explain how to sign into the VPN. A transparent proxy seems to be what I need, but my searches all seem to direct me to Squid, which is already running on my server and seems overkill for this simple task. Is there a simpler, lightweight program out there that does just this or should I just suck it up and run two instances of Squid (or figure out how to configure it)? Or, is this entire VPN thing I'm doing complete nonsense and I should just enable encryption on the wireless router?

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  • I think installing PostFix solved my problem, but it seemed *too* easy

    - by Joel Marcey
    Hi, This is a followup to a serverfault post I made a while ago: http://serverfault.com/questions/21633/how-do-i-target-a-different-mail-server-depending-on-domain-with-exim (More context here too: http://forum.slicehost.com/comments.php?DiscussionID=3806 ) I have a slice/VPS at Slicehost. I basically decided to scrap exim (i.e., purge it), and start anew with my email infrastructure. In case you didn't read any of the above threads, basically my goal was to have a send only mail infrastructure that relays all outgoing email to Google Apps. I also wanted to where email from domain1 (a Wordpress installation) would show it coming from domain1.com and email from domain2 (a normal website) would show it coming from domain2.com. So I decided to give PostFix a try. I literally followed the surprisingly simple instructions here: http://sudhanshuraheja.com/2009/02/slicehost-setup-outgoing-mail-google-apps-postfix/ And voila, all seems to be working as I expected. My email tests show email coming from the proper locations (either domain1 or domain2 depending on where the emails were sent from). But this all seemed too simple to me. So simple, in fact, that I feel that something is amiss. When I installed PostFix according to the instructions in the post above and it worked, I was surprised that I didn't have to specify an SMTP server, a port number, any authentication credentials, etc. My slice is set up such that I have MX records for Google Apps (e.g., ASPMX.L.GOOGLE.COM.) in my DNS settings, but I am not sure if that is why it is working. My email infrastructure knowledge is admittedly limited, but with this am I suspect to: Spammers using my email infrastructure? My emails going to people as spam? Something else sinister? I have actually stopped running PostFix until I understand this better. Thanks!

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  • What is easiest no fail way to publish asp.net app?

    - by Maestro1024
    What is easiest no fail way to publish asp.net app? Sorry a bit of an open ended question but I am having issues deploying an asp.net report project and any solution to get the site up is fine. I am running Win7/SQL 2008 and want to publish a asp.net report site that I created in VS 2008. Website launches when I run in debug in Visual studio but I want to publish the site so that it can be seen on the LAN. I published the files off to a folder and started up the IIS manager and added a new site and pointed to that folder. Set the permission on the folder to share to everyone. However when I go to the DNS name I put in for the website it does not launch. Any ideas on this? I see websites out there talking about a web sharing tab on the folder properties but I do not see that when I go to folders. Why might that be? Another avenue I have not pursued yet is publishing directly to a website. Has anyone tried that? Is that better or worse than publishing to filesystem?

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  • Backup plan for linux webserver in small business?

    - by radman
    Hi, I am currently in the process of writing a backup plan for the webserver in use by my business. I am very new to this area and have a few ideas about how things should work but am unsure of what tools to use and what sort of restore process is appropriate. I'm looking for something relatively simplistic and it doesn't have to be 100% paranoid just enough to give me a reliable backup. Speed is not of the essence and there is not going to be a live fallback in place. The backup will be onto a single hdd that will be stored onsite (no option for offsite as yet). Backups will be taking place weekly. I am constrained by both time and money which is why I'm aiming for a good enough solution. Is taking an image of the webserver system drive periodically and using that as the backup appropriate? Should I be testing that the backups restore correctly every time that I perform one? This is a bit broad but what setup would you use if you were in my place, given the services I am running? Should I add additonal machines and split the services? Any advice is much appreciated! See below for server details Webserver Platform Linux Ubuntu server Running mail-server svn-server mediawiki wordpress apache-webserver Hardware single 500gb sata drive Architecture Single machine behind router (with firewall) accessible to the internet.

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  • Sonicwall NSA 240, Configured for LAN and DMZ, X0 and X2 on same switch - ping issues

    - by Klaptrap
    Our Sonicwall vendor supplied and networked the NSA240 when we required a DMZ in our infrastructure. This was configured and appeared correct although VPN users periodically dropped DNS and Terminal Services. The vendor could not resolve and so the call was escalated to Sonicwall. The Sonicwall support engineer took a look and concluded that the X0 (LAN) and X2 (DMZ) intefaces were cabled to the same switch and so this is the issue. What he observed is a ping request to the LAN Domain Controller, from a connected VPN user, is forwarded (x0) from the VPN client IP to the DC IP but the ping response from the DC IP to the VPN client IP is on X2, a copy of the log is detailed below:- 02/02/2011 10:47:49.272 X1*(hc) X0 192.168.1.245 192.168.1.8 IP ICMP -- FORWARDED 02/02/2011 10:47:49.272 -- X0* 192.168.1.245 192.168.1.8 IP ICMP -- FORWARDED 02/02/2011 10:47:49.272 X2*(i) -- 192.168.1.8 192.168.1.245 IP ICMP -- Received X0 - LAN X1 - WAN X2 - DMZ The Sonicwall engineer concluded that we either need a seperate switch for X2 or we use a VLAN switch for both. I am the companies software engineer and we have yet to have heard back from the vendor, so I am lost at sea at the moment. Do we need to buy this additional equipment or is there another configuration on the NSA240 we can use?

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  • Can't connect remotely to Windows Server 2008 R2

    - by JohnyD
    I have a new Dell R710 server running Windows Server 2008 R2. I one of it's 4 nic's set up and the rest are not being used. I have successfully given it an ip address, network mask, and dns servers. I can ping and resolve this machine from anywhere else in the network. However, when I try to connect to it via RDP it does several things: 1) it might just outright refuse me with the message, "This computer can't connect to the remote computer. Try connecting again." 2) it might connect me and let me chose the account I would like to log on as... but when you select an account then you receive the same message as in #1 3) it might actually allow you to connect but only for about 1 minute and then you receive the same message and it closes your session. I have configured the firewall service to allow for RDP over the domain network connection. This didn't have any noticible effect. I have now disabled the firewall for all 3 networks and have even stopped the Windows Firewall service. I am still having the same issue. I am new to Server 2008 R2 and things are very different. Please give me any advice you can on how to resolve this issue and/or any other gotchas that are sure to come my way. The 2003 - 2008 learning curve seems steep. Thanks

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  • Excel 2007 - Adding line breaks in a cell and no line over 50 characters

    - by Richard Drew
    I have notes stored in an excel cell. I add line breaks and dates every time I add a new note. I need to copy this to another program, but it has a line limit of 50 characters. I want a line break for each new date and for when each date's comment goes over 50 characters. I'm able to do one or the other, but I can't figure out how to do both. I'd prefer words not to be split up, but at this point I don't care. Below is some sample input. If needed for a SUBSTITUTE or REPLACE function, I could add a ~ before each date in my input as a delimiter. Sample Input: 07/03 - FU on query. Copies and history included. CC to Jane Doe and John Public 06/29 - Cust claiming not to have these and wrong PO on query form. Responded with inv sent dates and locations, correct PO values, and copies. 06/27 - New ticket opened using query form 06/12 - Opened ticket with helpdesk asking status 05/21 - Copy submitted to [email protected] 05/14 - Copy sent to John Public and [email protected] Ideal Output: 07/03 - FU on query. Copies and history included. CC to Jane Doe and John Public 06/29 - Cust claiming not to have these and wrong PO on query form. Responded with inv sent dates an d locations, correct PO values, and copies. 06/27 - New ticket opened using query form 06/12 - Opened ticket with helpdesk asking status 05/21 - Copy submitted to [email protected] om 05/14 - Copy sent to John Public and email@custome r.com

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  • Windows 7 - system error 5 problem

    - by ianhobson
    My wife has just had a new computer for Christmas (with an upgrade from VISTA to Windows 7), and has joined the home network. We are using a mix of WindowsXP and Ubuntu boxes linked via a switch. We are all in the same workgroup. (No domain). Internet access, DHCP, and DNS server is an SME server that thinks it is domain controller (although we are not using a domain). I need to run a script to back up my wife's machine (venus). In the past the script creates a share on a machine with lots of space (leda), and then executes the line. PSEXEC \\venus -u admin -p adminpassword -c -f d:\Progs\snapshot.exe C: \\leda\Venus\C-drive.SNA With the wife's old XP machine, this would run the sysinternals utility, copy shapshot,exe to her machine and run it, which would then back up her C: drive to the share on leda. I cannot get this to work with Windows 7, nor can I link through to the C$ share on her machine. This gives me a permissions error (system error 5). The admin account is a full admin account. And yes - I do know the password. The ordinary shares on her machine work fine! I guess I'm missing something that Microsoft have built into Windows 7 - but what? The machine is running Windows 7 business, with windows firewall, AVG anti virus, and all the crap-ware you get with a new PC removed. Thanks

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  • Walkthrough/guide building aplication server for multi tenant web app [on hold]

    - by Khalid Adisendjaja
    The web app will detect a subdomain such as tenant1.app.com, tenant2.app.com, etc to identify tenant environment, each tenant environment will have a different database credential (port,db name,etc) but still connecting to the same database server. Each tenant should use app.com for their main domain, using their own domain is prohibitted. Each tenant will have their own rest api endpoint such as tenant1.app.com/api/v1/xxxx, tenant2.app.com/api/v1/xxxx, tenant3.app.com/api/v1/xxxx I've come to a simple solution by setting a wildcard subdomain (*.app.com) on webserver Apache/Nginx vhost configuration file. I have googled so many concept for building a multi-tenant app server but still don't understand how to really done it, what is the right way to do it and what is actually required to do this task. So I've come to this questions, Do I need a proxy server, dns masking, etc.. How to monitor each tenants activity What about server performance, load balancing, and scalability How to setup ssl certificate for each tenant what about application cache for each tenant Is it reliable to use the setup for production etc ... I have a very litte experience on server infrastructure, so I'm looking for a DIY walkthrough, step by step guide, or sophisticate solution ready to implemented for production

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  • Wiring my internet

    - by u8sand
    I have Verizon internet service and am currently using wifi. My router is in the basement and my desktop computer is 2 floors and on the other side of the house above it... Worst possible positioning but that's just how things worked out. My wireless currently is extremely unstable so I've decide to correct the problem by wiring my computer directly. The problem lies here: when redoing the room next to it (when the wall was open) we went ahead and wired some coaxial cable from our attic to our basement (with plenty of slack on both ends, don't ask me why we didn't go ahead and wire a CAT6 cable). The question is: Can I use the coaxial cable to bring me internet connection? Naturally the router (which needs to stay where it is) takes a coaxial cable input and has Ethernet outputs. So maybe I would have to take a ethernet cable, convert to coaxial-coaxial to my computer, convert back to ethernet. Is this even possible to convert from coaxial to ethernet? Or do I have to attempt to go ahead and fish a cat6 cable through my house. I cannot just split the signal because that would require two routers and two networks (which I don't believe would work with one cable-one ISP correct me if I'm wrong). Thanks

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  • Ram question in VMware Server 2

    - by ToreTrygg
    Hi, I understand from the VMware Server 2 documentation that VMware Server 2 is capable of running a 64-bit guest OS underneath a 32-bit host OS, as long as the hardware running the box is 64-bit capable. Here's my situation. We currently have an underutilized XEON X3220 Quad Core 64bit Server, running Server 2003, 32-bit and 2gb of RAM (the motherboard is capable of 8gb ram). The server is currently used mainly for file and print services. It is also running Active Directory, Novell eDirectory and Groupwise 6.5. We are planning a micration to Microsoft Exchange, so the Novell eDirectory and Groupwise services will eventually be purged from this box, leaving only Active Directory, File and Print services. Being that this server is underutilized we are hoping to save hardware costs and virtualize our new Exchange investment. My question is this. Will VMware allow access to the "invisible" extra memory that Windows 32-bit won't see. Meaning, if we increase the full amount of system ram to 8gb (yes, I know the 32-bit host OS will only see a maximum of 4gb), will I be able to assign maybe 5gb to the new Server 2008 64-bit OS running Exchange and leave 3gb for the Guest OS (or maybe even a 6, 2 split). The second part of that would be, would it be better to just convert the main OS currently running to an image, convert the machine itself to ESXi and run both OSes as images under ESXi. Downtime for this box is critical, so my preference is most definitly with the first option because it presents very minimal downtime. Doing the second would make downtime quite a few hours to image the machine and then convert the image to a VMware Image.

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  • Website Use Monitoring for 3 People

    - by linkedlinked
    I work in an IT startup with 2 partners, and I'm the programmer/IT guy -- in other words, the work horse. To make a long story short, I'm doing most of the work right now, while they spend all day on Facebook. That's OK, because they're paying my salary, but if the project fails, I'm sure they'll blame me for it (I'm doing my best to make sure that doesn't happen!), and I want some sort of recourse. I already have an app that blocks time-wasters on my local PC, and keeps logs of when the app is enabled (so I can say "I had Facebook blocked from 9am-5pm today.") Is there any way I can get a brief summary of the most heavily visited sites, split up by client PC? At the end of the month, I want to be able to say "You both load Facebook, on average, every 10 minutes. You spend hours a day on Youtube, and haven't opened up our bugtracker in weeks" and maybe have a nifty chart or graph to match it. We have a crappy D-Link router, and no IT budget. They are both on Windows Vista, I run Ubuntu Linux. I don't want to install any monitoring software on their PC, but I'm totally fine with, say, routing all the network traffic through my machine. I guess I can think of lots of ways to accomplish this (telnet into JSSH and list open tabs? log all the DNS requests, per-domain? even thinking of setting up a webcam on my desk and just keeping 5-minute snapshots...), I just don't really know where to start. Any advice is appreciated, thanks!

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  • What is the difference between disabling hibernation and idling time for a NAS?

    - by Gary M. Mugford
    I have two D-LINK DNS-323 NAS boxes with two Seagate drives in each. The first one is about a year old, the second one about three months. The first two on Monster are each 1.5T drives while the last two on Origami are 2T drives. I have never been overly happy with the Monster drives but, outside of poor throughput on small files, they have been consistently available to all programs after I put a batch file into my startup to do a directly listing of each. I added the two new drives when I added the Origami box. But, watching the dos box that comes up, I rarely see both listed before the box disappears. Other programs, backups, Belarc, even my file browsers, seem to have a dickens of a time seeing O: and P:. Finally, I decided to go into setup and turn off hibernation. Performance HAS been better since and Belarc, for instance, now sees both drives. At the time of poking around, I noticed an Idle Time feature too. What is the difference between the two settings? And for added points, how much trouble am I in for turning off hibernation? The super bonus round ... anything ELSE I should have done? Thanks in advance, GM

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  • RRAS Problem routing to central site from RRAS server only?

    - by TomTom
    Given is an office connected to headquarters using a RRAS bridge (2 virtual machines using RRAS to route between the two networks). Naming: The office is A, the RRAS on A is a-lnk. THe headquartters is B, b-lnk the RRAS machine there. The VPN works perfectly - machines can ping and work between the sites. Domain controllers on both ends replicating, DFS working, remote desktop working. All in all... everything is fine. EXCEPT: a-lnk itself can not reach any machine in B. This would normally not be troublesome (noone ever does anything on a-lnk), but there are two exceptions: * a-lnk is supposed to get it's license from a KMS in B, so not being able to reach B means it is not prolonging. * a-lnk is supposed to pull updates from a WSUS in B - and not being able to reach B means - no updates. Given that thigns work (and security is a minor issue - A-lnk is not reachable from the internet as it is behing a NAT hardware anyway) this got not handled for months. I just wan to get this item ticked off now. Anyone an idea what this is? It definitely is not a "dns does not work" or "routing in general is bad" item, as any computer in A can connect to any computer in B, and the other way arount - only the RRAS computer itself seems to do something really awkward. Platform for both: 2008 R2 standard.

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  • Is UPS worthwhile for home equipment?

    - by Jon Skeet
    Over the years, I've had to throw away a quite a few bits of computing equipment (and the like): Several ADSL routers with odd symptoms (losing wireless connections, losing wired connections, DHCP failures, DNS symptoms etc) Two PVRs spontaneously rebooting and corrupting themselves (despite the best efforts of the community to diagnose and help) One external hard disk still claiming to function, but corrupting data One hard disk as part of a NAS raid array "going bad" (as far as the NAS was concerned) (This is in addition to various laptops and printers dying in ways unrelated to this question.) Obviously it'll be impossible to tell for sure from such a small amount of information, but might these be related to power issues? I don't currently have a UPS for any of this equipment. Everything on surge-protected gang sockets, but there's nothing to smooth a power cut. Is home UPS really viable and useful? I know there are some reasonably cheap UPSes on the market, but I don't know how useful they really are. I'm not interested in keeping my home network actually running during a power cut, but I'd like it to power down a bit more gracefully if the current situation is putting my hardware in jeopardy.

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  • Cannot connect to remote mail server for sending emails in ASP.NET

    - by Dave
    I want to migrate a web application from a Windows Server 2003 to a Windows Server 2008 R2. All works fine except sending emails from the application. If I configure the application to use the smtp server on "localhost" it works, but changing it to the "real" host name (e.g. mail.example.org) no mail is sent. The error message says, that the remote server needs a secure connection or smtp authentication. But since it works when using "localhost" instead of the host name I doubt that this is the problem. Also it's unlikely a problem with the mail server, I also tried it with another one. So for me it seems like the firewall is blocking the outgoing connection to the mail server. I tried to open port 25, but it still did not work. Maybe I just did it the wrong way. Update: For clarifying my setup: I have a Windows Server 2008 R2 with hMailServer installed (set up for some of the hosted domains) For the website I'm talking about I need to use an external mail server (totally different hosting provider) Apparently I was a bit off the track. It seems like it works when using connecting to the local mail server either with the host name "localhost" or "mail.somedomain.com" (while somedomain.com is set up in my mail server). But when using the host name of the external mail server ("mail.externaldomain.com") it seems like it tries to connect to the local server again, although this domain is not set up in the mail server. Thanks to Evan Anderson for the tip to use telnet - why I have not thought of it myself?... :-) Note, the website www.externaldomain.com is hosted on my server but the DNS entries are maintained by the other hosting provider. "externaldomain.com" is the only entry which points to my server all other records (MX, subdomains) are pointing to the other server. So I think the question is now, how do i bring my server to connect to the external mailserver. Do I have to configure this in my mail server or is it a windows server thing?

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  • Can enabling a RAID controller's writeback cache harm overall performance?

    - by Nathan O'Sullivan
    I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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  • Firefox proxy authentication with Kerberos: one service ticket per connection (Linux)

    - by Dari
    I am trying to enable proxy authentication via Kerberos for Firefox. The setup is: Active Directory domain (for LDAP and Kerberos; this works and I can log in the computer and get Kerberos tickets without problems) Microsoft Windows witness machine (on which Firefox runs fine with no ticket problem) CentOS 6.3 system with Firefox (the tests were performed with both the 10.0.1 ESR found in the CentOS package repositories and the 15.0.1 downloaded from Mozilla's website) BlueCoat proxy with Kerberos authentication enabled For the moment, Firefox requests an element of a website, gets an HTTP error code of "407 Proxy Authentication Required" from the proxy, gets a ticket granting service (TGS) from the domain for the proxy and performs the request again while passing the ticket. The transaction runs fine. However, when more elements are requested (in parallel), Firefox requests one more ticket per proxy connection. And this takes many DNS queries, Kerberos interactions with domain controllers and costs a lot of time (for example, the home page of Adobe takes several minutes to load and at the end, I have about 30 valid Kerberos tickets). I am stuck on this since a while, and help would be greatly appreciated. Minor information: the CentOS operating system is virtualized with VMware Player 3.1.3, but I do not think this would be a game changer.

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  • How do I prevent or override a group policy on Windows 7?

    - by Kevin
    A few months ago my company was purchased by a large corporation. We recently switched our network over to the large corporate network which has more restrictions requirements. One of these is the requirement to use a proxy server for Internet traffic. However, some of our internal servers are not recognized by the corporate DNS, so we need to provide the fully qualified domain name. For W7, we make changes to the Internet Properties for IE8 and Chrome to include our domain name as an exception to the proxy server (e.g., *.foobar.com). The problem is that a group policy that does not include our domain name is continually pushed out to my systems throughout the day. This requires me to make the appropriate changes to the Internet Properties several times a day in order to access our internal servers. Is there a way that I can prevent the group policy from being pushed to my systems or detect when the group policy is pushed and override it? I am an administrator on all of my systems. I do have Firefox installed which is not subject to the same group policy push, but I need to have IE8 and Chrome working.

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  • How to create domain or router-level workgroup (dd-wrt micro)

    - by Anthony
    In Windows, is active directory required for using "Domain" instead of "workgroup"? Do I need to register a domain with a DNS provider like godaddy? What I really want to do is set up my home LAN so that everyone connecting to the main router (which is everyone, which is about 30 people) can see each other. I've tried having everyone use the same work group name, still hit or miss. I tried setting the domain name and host name on the router itself, still nothing. I've tried joining the domain name I set instead of work group, and I get an AD error. But ideally, everyone who is connected to the main router should simply just see each other and any shared folders. I've had this problem when I was not the network admin on other large LANs, and I've never been able to figure out why sometimes people disappear or never see each other. I'd really prefer using the native sharing functionality in the OS to setting up an internal FTP or Samba server, etc. Any sure-fire ways to fix this? (maybe an open source clone of AD?) Thanks!

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