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  • Dual SMTP Server issue with Unicast Network Load Balancing

    - by Igor K
    Using two servers with NLB, each box contains IIS and a mail server. Server1 is the primary Server2 runs the backup mail server The problem is the web app sends email to ourselves. When mail is sent from Server2 (via its own SMTP server) to ourselves, it tries to contact Server1, as its the mail server IP. But under Unicast mode of NLB, it cant reach the host via the public dedicated IP address. How can we get round this?

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  • Why is my SSH session timing out in less than a minute?

    - by John Smith
    Within a minute of connecting to my remote Linux server through SSH, my session times out and I cannot contact the server until a few seconds have passed. Meanwhile, I'm connected to other servers without interruption. This is only happening when I establish connection from an hotel wireless AP. When I connect from my phone's Internet, the problem does not occur. Does anyone know what might be causing these unusual timeouts?

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  • Add the "SAMBA File Server" role to a server running SCO Unix?

    - by I.T. Support
    We're trying to get network access to a hard drive on a server running SCO Unix from Windows Servers. I beleive we need to add the role "SAMBA File Server" to the server so we can mount the drive as a network share that we can access from Windows. Is it possible to add the SAMBA role to a SCO Unix operating system? Are there any gotchas or concerns? Thanks

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  • suggestions for fast reliable proxy IPs like codeen but with posting?

    - by barlop
    Hi, I am looking for a list like one offered by codeen http://codeen.cs.princeton.edu/ of fast reliable proxy servers.. I just want to be able to "post" on usenet or yahoo groups with them.. I think the codeen ones don't allow HTTP-POST I don't need them for downloading or for torrents, or even for any images.. they can block images to keep browsing faster. I know it's not a list, but I did try TOR once, but it was horribly slow.

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  • Echo 404 directly from nginx to improve performance

    - by user64204
    I am in charge of production servers serving static content for a website. Those servers are constantly being crawled by bots looking for potential exploits (which isn't that much of a problem security-wise because no application can be reached behind the web server) but generates thousands of 404 per day, sometimes per hour. I am looking into ways of blocking those requests but it's tricky (you want to make sure you don't block legitimate traffic and these bots are becoming more and more clever at looking like they're legit) and is going to take me a while to find an acceptable solution. In the meantime I would like to reduce the performance impact of serving those 404 pages. Indeed we're using nginx which by default is configured to serve it's 404 page from the disk (This can be changed using the error_page directive but in the end the 404 will either have to be served from disk or from another external source (e.g. upstream application which would be worst)) which isn't ideal. I ran a test with ab on my local machine with a basic configuration: in one case I echo a message directly from nginx so the disk isn't touched at all, in the other case I hit a missing page and nginx serves its 404 from disk. server { # [...] the default nginx stuff location / { } location /this_page_exists { echo "this page was found"; } } Here are the test results (my laptop has Intel(R) Core(TM) i7-2670QM + SSD in case you're wondering why they are so high): $ ab -n 500000 -c 1000 http://localhost/this_page_exists Requests per second: 25609.16 [#/sec] (mean) $ ab -n 500000 -c 1000 http://localhost/this_page_doesnt_exists Requests per second: 22905.72 [#/sec] (mean) As you can see, returning a value with echo is 11% ((25609-22905)÷22905×100) faster than serving the 404 page from disk. Accordingly I would like to echo a simple 404 Page not Found string from nginx. I tried many things so far but they all failed, essentially the idea was this: location / { try_files $uri @not_found; } location @not_found { echo "404 - Page not found"; } The problem is that as soon as the echo directive is used, the http response code is set to 200. I tried changing that by doing error_page 200 = 400 but that breaks the configuration. How can I serve a 404 page directly from nginx? (without hacking the source which may be might next step)

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  • Can't find windows 2000 domain after PDC Change

    - by Mark A Kruger
    This is a windows 2000 domain issue. I had an old win2000 PDC that was beginning to fail. So, trying to be pre-emptive, I installed a new BDC, then "demoted" the old PDC and took it off the network. Now it appears that no member server can "find" the domain anymore. No logins work (for services or a RDP or anything). What I've tried (based on googling): Verified sysvol is shared on all servers. Used nslookup to verify that DC's are being found. netdiag /fix meta data cleanup routines. verified no firewall issues (port 389 etc) seizing all roles to new PDC (I did that as part of the original promotion). LMHOST file and Netbios settings. At the moment it seems like I can get the DC's returned but cannot contact them. I'm at a loss. My latest attempt was to remove a member server from the domain and try to "re-add" it. When I do that I get this message: The query was for the SRV record for _ldap._tcp.dc._msdcs.cfwebtools.com The following domain controllers were identified by the query: db-dev1.cfwebtools.com file-prod1.cfwebtools.com cfwt-pdc2.cfwebtools.com However no domain controllers could be contacted. It then goes on to ask if I've checked my A record and made sure they are running. Is there a way to force this domain to be seen? I also shared sysvol (or double checked it) and restarted the dfsr service. More information. I got looking at sysvol and found it was not shared on 2 of these servers. Only one of them (db-dev1) has a "good" or at least "populated" sys vol store. So I tried doing a "d2" recovery of my PDC against that good sysvol. But it never synchs - or at least it does not seem to synch. I'm guessing if I could get sysvol and netlogin to kick in and replicate that would fix my issue. I think these DC's aren't responding because they are waiting for replication which is broken somehow. Would taking down all the DC's except for db-dev1 fix the issue - at least temporarily? I know I can't just copy the sysvol stuff over to the other 2 can I?

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  • NAS backup - multiple machines

    - by Adam
    HI We are looking to backup between 50-100 servers to a NAS box each night (Contains of each server ie files and folders). We need the backup application to backup to a NAS and perform incremental backups following the full backup. We also need to be able to store versions of each file. The full backup will probably be about 5TB. Does anyone know a a cheap or free application which will do this? Thanks

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  • how many tables can an MS SQL database hold?

    - by Peter Turner
    I've ran into this cryptic statement for SQL Server: Files Per Database 32,767. What does that mean exactly? Is there a maximum number of tables for a given version of SQL Server. We try to support SQL Server post 2005 32-bit and 64-bit. So if anyone has a handy dandy table they use to figure out how many tables they can have per DB for Microsoft SQL Servers I'd heartily appreciate seeing it.

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  • How can I use dig(1) to test GeoDNS resolution for a specific IP?

    - by cnst
    There's a rumour that public domain name resolvers, like Google Public DNS, are still supposed to work with GeoDNS, because there's some field in the requests that lets them specify for which IP address they are doing a resolution, thus the authoritative servers can give a given resolver different resolutions for different final clients. What's this whole thing called as far as RFCs go, and how does one mimic such resolutions, for testing purposes, e.g. with dig(1)? Else, what other tool is available to accomplish said task?

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  • Can I limit remote desktop to a particular network card?

    - by Jack Mills
    I have two routers/internet connections connected to my PC. One is a slower connection with a fixed IP that I use for business, the other is a faster connection I use for day to day surfing. I have to use the fixed IP connection to log onto certain servers (due to security) to work but I'm finding that often my PC will try to use my other internet connection to connect which will get rejected (as it doesn't have the fixed IP). Can I limit remote desktop to use a particular network card to get around this problem. Note: I'm running Windows 7

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  • Change a Munin server and keep the data

    - by Khelben
    We are migrating some servers, and we need tp change our Munin server. Most of the Munin nodes are not changed, and we would want to keep track of the historical data, if possible. I can set up a new Munin server, but I like to know if it's possible to transfer the old data to the new server, and how to do it.

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  • HP storageworks ultrium 448

    - by Graham
    Goodday, I have never cleaned the servers at my work but they are now running 5 times a week for 5 years. Now they asked me to clean it with the tape that has come with it. My qeustion is how do you clean it? Just put the tape in but then what? Hope someone gives me an answer.

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  • Is it possible/advisable to run VMware Server ESX/ESXi on a laptop?

    - by cletus
    The idea of having a small footprint hypervisor as the primary OS on a laptop or desktop where every "real" OS is a guest appeals to me. Now I realize this software is more typically used on blades and the other servers but can it be done on a normal PC? Should it be? What requirements are there (eg hardware/BIOS/chipset)? Is there a performance impact for doing so? Is it a good/bad idea?

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  • QEMU & libvirt: Dual screen VM?

    - by thecapsaicinkid
    I'm running a Windows 7 guest virtualised under QEMU and using libvirt on a Fedora 17 host, does anyone know if it's possible to create 2 video 'cards' (or a single dual-head) and a spice server for each and connect multiple spice clients to simulate a dual screen VM? Looking through the VMs xml configuration file I can't see a way to associate elements (eg. Spice servers) to elements (in this case, a qxl card). I'm sure qxl doesn't support the dual-head option but are multiple video elements possible?

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  • Determining which database instance makes biggest IO

    - by user2008937
    Assuming that I have a dedicated server on which I am running multiple instances of mysql and postresql servers. How without iotop determine which instance in particular time (proc/pid/io shows data collected in some peroid of time) makes the biggest IO (so it increases IOWAIT)? When lots of ppl do something on DB then I clearly see which instance is making the load because of high cpu usage, but I had a situation when the cpu usage was just normal, but very high iowait made a huge load on server and i had problem finding process that was making some outstanding IO

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  • Default user profile getting filled with temp ie files

    - by Christoffer
    I have several Windows Server 2003 Terminal servers to service our domain users. Sometimes the Default User profile (C:\Documents and Settings\Default User) gets filled with tempoary internet files, so when a new user logs in, he gets a 1GB profile (instead of 20MB) that fills up the server fast. Why is it the default user profile gets filled up with files like that, by who and how do i prevent this?

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  • Squid vs mod_proxy (apache)

    - by Fahim Akhter
    Hi, New to servers, been hovering on http://highscalability.com/ for some days. Most of the architectures there show that people are using squid for proxy. Apache also provided mod_proxy which to a noob eye seems pretty much the same. Is there a perticular reason to opt for squid instead of mod_proxy? Thanks

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  • What's the easiest way to duplicate a portion of a directory structure onto an external drive?

    - by Jon Cage
    I'm trying to move a large chunk of data from one of our servers onto an external drive for delivery to Amazon glacier storage. To do that, I'd like to copy a chunk of the server, preserving the directory structure. I.e. move this: \\MyServer\Some\Longwinded\Path\TheDataIWantToCopy \\MyServer\Some\Longwinded\Path\TheDataIWantToCopy\First bit of data\DataFile1.dat to this: D:\ D:\First bit of data\DataFile1.dat

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  • Total RAM % from perfmon Windows Server 2008 R2

    - by Xaxum
    I am trying to find a good way to get available RAM percentage from perfmon. I can get Available Mbytes but I can't find any way to get the total installed memory on the server or what is in use via perfmon. I can obviously alert on GB but each of my servers have different total RAM so not a great alert. The way I understand % Committed Bytes is this includes page files on disk so this is not a good indicator. Any help would be appreciated.

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