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• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

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• "Safe" personal router use on apartment-wide network

  - by noisetank

  I recently moved into an apartment with internet included in my rent. This was a boon at first, but now I'm feeling limited. To get devices connected (wired or wireless), I have to whitelist the MAC addresses on mycampusnet.com. This is annoying (considering I'm well over the 10 device limit including my roommate's stuff), but what's really driving me mad is that I don't seem to have any semblance of a "local" network. I've relied heavily on static IPs and port forwarding in the past (accessing NAS and remote desktop) and (as far as I can understand), that functionality is nonexistent without my router set up. Also, as my wired and wireless devices don't always seem to make it onto the same subnet, I'm unable to use any of my iDevices with my Apple TV (I can, however, mirror to no less than four strangers' Apple TVs at any moment, which is a whole other level of discomforting). I've talked to the head of the apartment complex and she told me that they personally don't have any issue with my using a router, but the provider (CampusConnect) does not currently allow it. Apparently, enough people have put in complaints/requests about the restriction (the apartments are for graduate students and University staff, many of which need to set up things like VPNs for work reasons) to open up some sort of ticket to get the functionality in place, but all the calls I've made to get status updates have been a waste of time. My question is: If I plugged my router into the apartment network, what would happen? I've been told already that personal routers would "interfere with the wireless" and that they would shut my port down if I used one, but is that a legitimate thing or just something made up that sounds real to keep the average Joe from pushing it further? I'm guessing there's some way of configuring my router to keep it from disrupting the rest of the network, but it's not something they want to tell me for obvious reasons. Am I right? And if so, what are the chances that they'd notice the difference in traffic or whatever and shut off my port?

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• Does MySQL have some kind of DoS protection or per-user query limit?

  - by Ghostrider

  I'm a bit at a loss. I'm running a MySQL database that's roughly 1GB data in indices combined on a dedicated Linux server. DB version is '5.0.89-community'. Configuration is controlled via cPanel. PHP actually runs elsewhere on a shared hosting. IP addresses are static and don't change. Access from remote IP address is properly configured. Website gets around 10K hits per day with each hit generating a a database query. Some of these queries are expensive (~1 sec execution time). All is fine and well until at some point DB server starts refusing connections from the client, claiming that specific user can't access the server from that IP. Resetting the server will always fix the problem for a day or two and then the same thing happens. There are some other DBs on that server, some of which are hit pretty hard on occasion but constantnly. One of the apps maintains several persistent connections since it does couple of updates per minute. Though I don't think it's related. What's driving me mad is that I can't figure out why server would start refusing connections. There is nothing in the logs. This server is a hosted dedicated server so hosting company created the OS image and I didn't write or go over every line of configuration. I'd do it but I'm at a loss as to where start looking. Any advice is appreciated.

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• cannot connect to <server_name>\sqlexpress

  - by Jackson Sunuwar

  I have tried disabling firing wall and checked sqlbrowser is started but for some reason I cannnot connect to my datbase... called server_name\sqlexpress.. I have a virtual machine and a full scale MS SQL Server 2008 R2 running on it... and I have several other vm running sqlexpress. they run fine and I can connect to them using sqlexpress... but when i try to access from sqlserver... I get this error. A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) (Microsoft SQL Server, Error: -1) Digging deep into the error, I found this Error Number: -1 Severity: 20 State: 0 and finally this... Program Location: at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.SqlServer.Management.SqlStudio.Explorer.ObjectExplorerService.ValidateConnection(UIConnectionInfo ci, IServerType server) at Microsoft.SqlServer.Management.UI.ConnectionDlg.Connector.ConnectionThreadUser() Firewall is turned off on the VM that's running mssqlserver... I turned of firewall on one of the vm that's running the sqlexpress but I still get the error... can someone please help... thank you

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• VPN Client solution

  - by realtek

  I have several VPN's that I need to establish on a daily basis but from multiple workstations. What I would like to do it have either a server or vpn router that can perform this connection itself and that I can then route traffic through this device or server depending on the subnet I am trying to reach. The issue is that I only use VPN Clients to connect, so I am basically trying to achieve almost a site to site VPN but by using basically a VPN Client type connection from my network. The main VPN Client I use is the Sonicwall Global VPN Client where I initially use a Preshared Key and then it always prompts me for a username and password (not RSA key). My question is, is there any type of linux distro or even a hardware vpn router that can do this and connect to a Sonicwall device as if it were a client? I have tried pfSense which is very good but it fails to connect, probably due to a mismatch of settings. I have tried many others. Even dd-wrt on my router but it does not support whatever protocol Sonicwall uses. (I thought L2TP/IPSec) but it appears it may not be that. Any advice would be great! The other other thing I have thought of that I have not tried yet is Windows Server Routing and Remote Access but I have a feeling that won't work either. Thanks

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• Want to use something like Citrix XenDesktop, Free Alternative?

  - by Chris

  I'm looking to go into IT, general office server management, and it looks like XenDesktop would be a awesome tool to use. If I get it right, you would store a central image of the OS you want to deploy (in an iso file) on the main server. Then use XenDesktop to pull that image down to the client, and it will then boot the OS inside of the virtual machine. Does it download the image of the OS and store it locally (like cloning the VM onto the client?) I'd love to find a free (possibly open source?) alternative to this, I keep on hearing about KVM in Linux and PXE booting a minimalistic OS to use remote KVMs.... Would that be what I'm looking for? Ideally, I'd like a system.. - That allows me to manage one central image for multiple clients (virtualized hardware) - Easily boot a thin client OS that connected to XenDesktop. Would those things be possible with some kind of free alternative? Some guidance would be greatly appreciated.

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• Connecting to my home router web interface from work

  - by Joe

  Hi, I'm trying to connect to my home router web interface from work. I use dyndns, because I don't have a static IP at home, and it works perfectly from any other place except my workplace (update: I made a mistake, see edit below). When trying to access the web interface from work I get a "500 Server Error" with the code: SERVER_RESPONSE_RESET. I'm not trying to use any protocols such as remote desktop, I'm only trying to access the web interface. I can access any other web page from my workplace with no problems, and I think my router web interface is like any other web page, isn't it? I thought maybe my work place proxy blocks addresses of services like dyndns, so I also applied another trick. Since I have a web page on my own domain (say www.mydomain.com) which I can access from work, I tried adding a CNAME to my domain which is linked to the dyndns address (router.mydomain.com). This way if anyone enters the address router.mydomain.com from anywhere, they reach my home router web interface, and there's no way of knowing it's a dyndns address (or is there?). However, it still doesn't work from my workplace (I get the same error message). Any ides? Edit: I'm sorry to say I made a mistake earlier. I used to be able to access my home router web interface from my old workplace, and I thought it was still possible since I don't recall making any configuration changes. However, after reading the replies, I went over to my old workplace and checked, and it doesn't work from there either. I'm very sorry for giving out wrong and misleading information about my problem. So to summarize: my problem is that I can't access my home router web interface from anywhere.

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• When connecting to PPTP Centos via Windows 7 VPN, I get error 2147943625

  - by Charlie Dyason

  The remote computer refused the network connection. phrase has been my arch enemy for the past week now I recently "bought" a VPS server, I gave up trying to configure it with OpenVPN, all the issues were making me lose my mind, so I tried the easier way with pptp, but i figure, both are leading to a dead end... I followed this post (many others too but this is the unlucky one), http://blog.secaserver.com/2011/10/install-vpn-pptp-server-centos-6/ and it all goes well with the setup, however, I run into this error when connecting to the VPN in Windows 7 here is a pic of the error: Image So I do not know what I have done wrong... When connecting, Code: Select all netstat -apn | grep -w 1723 before connecting: netstat -apn |grep -w 1723 tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 1137/pptpd after the error came I tried again: netstat -apn |grep -w 1723 tcp 0 0 0.0.0.0:1723 0.0.0.0:* LISTEN 1137/pptpd tcp 0 0 41.185.26.238:1723 41.13.212.47:49607 TIME_WAIT - iptables: # Generated by iptables-save v1.4.7 on Fri Nov 1 18:14:53 2013 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [63:8868] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i eth0 -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -i eth0 -p tcp -m tcp --dport 1723 -j ACCEPT -A INPUT -i eth0 -p gre -j ACCEPT -A FORWARD -i ppp+ -o eth0 -j ACCEPT -A FORWARD -i eth0 -o ppp+ -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Fri Nov 1 18:14:53 2013 # Generated by iptables-save v1.4.7 on Fri Nov 1 18:14:53 2013 *nat : PREROUTING ACCEPT [96:12732] : POSTROUTING ACCEPT [0:0] : OUTPUT ACCEPT [31:2179] -A POSTROUTING -o eth0 -j MASQUERADE COMMIT # Completed on Fri Nov 1 18:14:53 2013 options.pptpd the only changes was the require-mppe # BSD licensed ppp-2.4.2 upstream with MPPE only, kernel module ppp_mppe.o # {{{ refuse-pap refuse-chap refuse-mschap # Require the peer to authenticate itself using MS-CHAPv2 [Microsoft # Challenge Handshake Authentication Protocol, Version 2] authentication. require-mschap-v2 require-mppe # Require MPPE 128-bit encryption # (note that MPPE requires the use of MSCHAP-V2 during authentication) require-mppe-128 # }}} I check the iptables, everything is normal, all INPUTs, etc are before rejects, username and password I also checked in chap-secrets file, I am really puzzled...

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• Distributing processing for an application that wasn't designed with that in mind

  - by Tim

  We've got the application at work that just sits and does a whole bunch of iterative processing on some data files to perform some simulations. This is done by an "old" Win32 application that isn't multi-processor aware, so new(ish) computers and workstations are mostly sitting idle running this application. However, since it's installed by a typical Windows Install Shield installer, I can't seem to install and run multiple copies of the application. The work can be split up manually before processing, enabling the work to be distributed across multiple machines, but we still can't take advantage of multiple core CPUs. The results can be joined back together after processing to make a complete simulation. Is there a product out there that would let me "compartmentalize" an installation (or 4) so I can take advantage of a multi-core CPU? I had thought of using MS Softgrid, but I believe that still depends on a remote server to do the heavy lifting (though please correct me if I'm wrong). Furthermore, is there a way I can distribute the workload off the one machine? So an input could be split into 50 chunks, handed out to 50 machines, and worked on? All without really changing the initial application? In a perfect world, I'd get the application to take advantage of a DesktopGrid (BOINC), but like most "mission critical corporate applications", the need is there, but the money is not. Thank you in advance (and sorry if this isn't appropriate for serverfault).

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• How to detect/list rogue computers connected to a WIFI network without access to the Wifi Router interface?

  - by JJarava

  This is what I believe to be an interesting challenge :) A relative (that leaves a bit too far to go there in person) is complaining that their WIFI/Internet network performance has gone down abysmally lately. She'd like to know if some of the neighbors are using her wifi network to access the internet but she's not too technically savvy. I know that the best way to prevent issues would be to change the Router password, but it's a bit of a PITA having to re-configure all wifi devices... and if the uninvited guest broke the password once, they can do it again... Her wifi router/internet connection is provided by the telco, and remotely managed so she can log-on to their telco account's page and remotely change the router's Wifi password, but doesn't have access to the router status page/config/etc unless she opts out of the telco's remote support and mainteinance service... So, how could she check if there are guests in the wifi with this restrictions and in the most "point and click way"? In this case I'd probably use nmap to look for other devices in the network, but I'm not sure if that's the easiest way to do it. I'm not a wifi expert, so I don't know if there are any wifi-scanning utils that can tell us who's talking to the router... Lastly, she's a Windows user as I guess that'll influence the choice of tools available Any suggestions more than welcome Regards!

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• How do I collect SNMP readings from intermittently-connected sites?

  - by Luke404

  I am collecting SNMP data on-site for a number of systems, currently using Cacti. These systems are spread on a number of sites that aren't always connected to internet, but I also need to centralize the data on a single system (datacenter housed server) and get graphs out of it. If I directly poll remote systems with a centralized Cacti I'd loose data when a site is not connected to internet. I should record data on-site (I have a server at each site and I can run whatever I want on it) and then 'sync' everything to the central system. One hack could be a cacti or directly an rrdtool on site and then periodically rsync RRD data to the central Cacti system, but that doesn't sound like a 'clean' solution: every RRD would have to be defined at both places and rsync scripts setup with the specific file names. Can you suggest a better solution? Cacti is not a requirement but I'd like to use something like that on the central system. On-site systems need only to collect data I don't need to graph it there or manage users rights to view data and stuff like that, users will only access the centralized system.

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• Hosting a server for websites, ftp and random use at home?

  - by Zolomon

  I'm wondering what's the best option for me if I want to move all my hosted websites (from a hosting company) to a server at my own home? Basically, the needs I have are: be able to host websites using PHP/ASP.NET (haven't really decided yet - both would be preferred!) enable FTP so I can create accounts for my family members to access the server for file handling SSH SSL - for secure connections (this is something you have to buy/apply for per domain, not sure if there are any server side settings that have to be made) be able to stream video remote desktop host home-brew applications that can run as services use either MySQl/SQLite/SQL for relational database storage What should I think of before I buy a server? What hardware will I need, what will limit my server? I basically want to learn networking better as I'm a software and web developer but haven't had the resources to acquire any serious toys until now. At the time of writing, most of my websites have 60 visits/day so I don't suspect them to be very demanding. Is there something I haven't thought of that I should have? What OS would you suggest I run? FreeBSD vs Windows Server vs ?

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• Running KVM/XEN/Hyper-V VMs from a RAM disk, is this possible? Practical?

  - by Ausmith1

  Currently I'm using ESX (v3 and v4) to test a scripted OS (Windows 2003) and application install DVD. The DVD ISO (8GB) is mounted on a 1Gbps NFS datastore and the VMDK's (20GB) are on an SSD mounted via NFS over a 10Gbps link. It still takes a lot longer than I'd really like for to run through a test iteration and I'm wondering if mounting the virtual disks and ISO on a RAM disk on the same server as the hypervisor is running on would be worth my while. I can dedicate a server to this VM and 32GB of RAM in the system should be adequate to do the trick I'd guess. (1GB hypervisor OS, 28GB RAM disk and 2GB for the VM is < the 32GB available to me) Since hosting a RAM disk within ESX does not seem possible I'm open to trying KVM/Xen/Hyper-V. KVM would probably be my first choice of these three. Anyone out there tried this? Bear in mind this is purely for a test run of the installer, the VM will be discarded as soon as the test is completed so I'm not worried about losing data from the remote possibility of a power failure.

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• Pair programming with tmux and Vagrant

  - by neezer

  Does anyone have a clear step-by-step guide for setting up a shared tmux session on a Vagrant vbox that my coworkers (on our local office lan) could SSH into? The articles I've found online only seem to cover setting this up from machine to machine (no virtualbox setups), and I'm not very good at networking, so I haven't been able to extrapolate a solution... We're all running the latest Macs in our office, btw. Here's one article I've found but haven't been able to get working with Vagrant: http://blog.voxdolo.me/remote-pairing-with-vim-and-tmux.html EDIT: To clarify, I don't really know how I should be setting up Vagrant to allow me to SSH into it from a machine outside the one hosting the VM. The article above suggests that I add the tunnels host on my physical machine running the VM (here-on referred to as the MBP), so I did that. Next is the ProxyCommand host declaration, which I have also assumed should live on the MBP. So next I try SSHing into the MBP from a guest machine (another separate physical machine on my network), and that seems to work... but that only gets me into the MBP, not the Vagrant image running on the MBP. I normally login Vagrant image on the MBP via vagrant ssh (per the docs), and I know how to forward ports on the Vagrant VM to the MBP, but it's unclear to me how I could forward ports/SSH from the MBP to the Vagrant VM, which I assume I would need to do so that my guest machine could SSH in--through the MBP--to my Vagrant image. That, in a nutshell, is what I'm trying to accomplish. I do my development work in Vagrant VMs which keeps my MBP nice and clean of any dev-related cruft and also keeps my dev environments totally isolated from one another, yet I would like to start pair-programming with my coworkers via tmux, thus the reason why I've asked this question. I would like to accomplish all of this without setting up an additional user account on the MBP, or giving my coworkers access to my local user account on the MBP to get to my Vagrant VM, if that's at all possible.

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• Anonymous FTP upload on CentOS 5.2

  - by Craig

  I need to allow users to upload files to an FTP server anonymously. They should not be able to see any other files, or download files. It is a CentOS 5.2 server. I have a separate partition for the the upload area (mounted at /ftp). I have tried to set up vsftpd, followed all the instructions/advice I could find. But, when a user logs in and tries to transfer a file it throws a "553 could not create file." error. If I do a 'pwd' it shows the directory as "/" rather than the anon_root of "/ftp/anonymous". Any attempt to change the remote directory ends with "550 Failed to change directory.". I have a subdirectory "/ftp/anonymous/incoming" that is writable for the uploads SELinux is in permissive mode. I am running version 2.0.5 release 16.el5 of vsftpd. Here is the vsftpd.conf file: anonymous_enable=YES local_enable=YES write_enable=YES local_umask=002 anon_umask=007 file_open_mode=0666 anon_upload_enable=YES anon_mkdir_write_enable=NO dirmessage_enable=YES xferlog_enable=YES connect_from_port_20=YES chown_uploads=YES chown_username=inftpadm xferlog_std_format=YES nopriv_user=nobody listen=YES pam_service_name=vsftpd userlist_enable=YES tcp_wrappers=YES ftp_username=inftpadm anon_root=/ftp/anonymous anon_other_write_enable=NO anon_mkdir_write_enable=NO anon_world_readable_only=NO dirlist_enable=YES Can anyone help?

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• What is the ideal way to set up multiple FTP enabled web accounts on Fedora?

  - by Nicholas Flynt

  I'm setting up a test server for use as a web development platform, and I'd like to mimic as closely as I can a typical shared hosting setup. That is, I'd like my server to have multple user FTP accounts, each of which links to a directory containing the webroot of the site, and I'd like apache to be able to easily see and manupulate these files. I'll admit: I'm not as familiar with Fedora as I'd like, I run Ubuntu on my home box and SElinux is giving me some grief. My initial plan was to have each user FTP into their home directory, and put the web directory there as well, but SElinux throws a hissy fit when apache tries to access anything outside of its web directory, so that plan was a no go. Would it be wise to continue this route, and perhaps mount web directories in user home folders so that FTP could still be used to access them, even though apache saw them in var/www like it expects? Would it make more sense to set up custom FTP accounts and use a single FTP user on the server box? What's the general course of action on something like this? I'm using vsftpd right now to host web directories, which is why I'm liking the home directory approach (it's simple and secure) but of course there's bound to be a better way to go about it. Thanks. (I'll leave other things, like restricted DB access and such, to another post. I'm interested right now with just getting FTP and apache to play nice in a multi-user environment.) PS: For the record, an issue I ran into when doing all of this was that if apache isn't running as the same user as the FTP account is saving as, there are permissions errors when FTP creates files, requiring the remote user to chmod the files to fix it. A logical fix would be to run apache in a special group, put all web users in this group, and have FTP access default to giving this group read/write access to everything like apache would expect, but I never could figure out how to accomplish this. Bonus points and cake if you know a solution.

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• Windows 2012 RDS Temporary profile for Administrator

  - by Fabio

  I've configured a Windows 2012 RDS Farm with two virtual servers (VMWare - each one on a different ESX server). Both servers have Licensing, Web Access, Gateway, Connection Broker and Session Host roles. High Availability is set up and it works fine. Remote Apps are working and even Windows XP clients have access to the web interface. User profile path is \vmfiles1\UserProfileDisks\App\ and almost everyone has full right access to it. The problem I have is that I would like to be able to access both servers at the same time with the Administrator account (console), but each time I try, the second server that I logon to give me access with a temporary profile. I tried to enable/disable multiple sessions per user and forced Admin logoff with the GPO but nothing changed. Another thing is that the server pool is not saved, so each time I restart the RDS server or I logoff from it, I have to add a server in the server manager. Do you have any idea? Sorry if my english is not perfect.

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• Cannot establish XMPP server-to-server connection with gmail

  - by v_2e

  My jabber-server fails to connect to gmail.com giving the error: outgoing s2s stream myserver.com.ua-bot.talk.google.com closed: undefined-condition (myserver.com.ua is a Google Apps Domain with Talk service enabled.) I am using the Prosody XMPP server. It works just fine with other jabber-servers I tested so far (e.g. jabber.ru). However, when some of my clients tries to add a gmail contact to his contact-list, the subscription request lasts forever, and the Prosody gives the following sequence of messages in its log: Oct 21 22:57:16 s2sout95897f8 info Beginning new connection attempt to gmail.com ([173.194.70.125]:5269) Oct 21 22:57:16 s2sout95897f8 info sent dialback key on outgoing s2s stream Oct 21 22:57:16 s2sout95897f8 info Session closed by remote with error: undefined-condition (myserver.com.ua is a Google Apps Domain with Talk service enabled.) Oct 21 22:57:16 s2sout95897f8 info outgoing s2s stream myserver.com.ua->gmail.com closed: undefined-condition (myserver.com.ua is a Google Apps Domain with Talk service enabled.) Oct 21 22:57:16 s2sout95897f8 info sending error replies for 2 queued stanzas because of failed outgoing connection to gmail.com Here for the domain name of my server I use myserver.com.ua I found a similar problem described in this thread, but there is no detailed description of the solution there. As for the Google services, I did have a google account where I added the domain name under question to the Webmasters tools page. However, I deleted my account long ago, so now it is unclear, how any of the Google services can relate to my domain name. So my question is: What is the real cause of this problem (my jabber-server configuration or imaginary Google account or something else) and how can I make my Prosody server connect to gmail.com jabber service?

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• Solaris 10 invalid ARP requests from 0.0.0.0? Link up/down every hour or 2

  - by JWD

  The guys at the data center where I'm hosting a server running Solaris 10 are telling me that my server is making a lot of invalid arp requests. This is an example of a portion of what was sent to me from the logs (with Mac addresses and IP addresses changed). [mymacaddress]/0.0.0.0/0000.0000.0000/[myipaddress]/[Datestamp]) It's being logged every hour. I don't see anything in the arp tables (arp -a) or routing tables (netstat -r) and I don't see anything relating to 0.0.0.0 when snoping the arp requests. The only place I see any reference to 0.0.0.0 is if I do netstat -a for the SCTP SCTP: Local Address Remote Address Swind Send-Q Rwind Recv-Q StrsI/O State ------------------------------- ------------------------------- ------ ------ ------ ------ ------- ----------- 0.0.0.0 0.0.0.0 0 0 102400 0 32/32 CLOSED But not really sure what that means. Doesn't seem like I can disable SCTP. There are some tunable SCTP parameters but it's not something I'm familiar with. Do I have to add changes to /etc/system? Looks like sctp_heartbeat_interval might be what I need to change? If it makes any difference, I have a few solaris zones running on this server, each with their own IP address on a virtual interface. eth0:0, eth0:1, etc. Does anyone have any idea what might be causing this and how to stop it? I think the switch I'm connected to doesn't like it and momentarily drops the connection. Is there anyway to at least block those requests using ipfilter or something else? Update: This was happening more frequently but now it seems to be happening roughly every hour or every two hours. It's not consistent. I tried setting setting the link speed and duplex to match the switch port and that seemed to make it stop happening for a few hours but then it started again.

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• Apache Server Redirect Subdomain to Port

  - by Matt Clark

  I am trying to setup my server with a Minecraft server on a non-standard port with a subdomain redirect, which when navigated to by minecraft will go to its correct port, or if navigated to by a web browser will show a web-page. i.e.: **Minecraft** minecraft.example.com:25565 -> example.com:25465 **Web Browser** minecraft.example.com:80 -> Displays HTML Page I am attempting to do this by using the following VirtualHosts in Apache: Listen 25565 <VirtualHost *:80> ServerAdmin [email protected] ServerName minecraft.example.com DocumentRoot /var/www/example.com/minecraft <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/example.com/minecraft/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> </VirtualHost> <VirtualHost *:25565> ServerAdmin [email protected] ServerName minecraft.example.com ProxyPass / http://localhost:25465 retry=1 acquire=3000 timeout=6$ ProxyPassReverse / http://localhost:25465 </VirtualHost> Running this configuration when I browse to minecraft.example.com I am able to see the files in the /var/www/example.com/minecraft/ folder, however if I try and connect in minecraft I get an exception, and in the browser I get a page with the following information: minecraft.example.com:25565 -> Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /. Reason: Error reading from remote server Could anybody share some insight on what I may be doing wrong and what the best possible solution would be to fix this? Thanks.

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• Network card/driver stops under heavy load

  - by Uwe Keim

  Since about approx. 2 month, I do have the following issue with my approx. 1 year old development machine (Windows 7, 64 bit): When doing network intensive operations, like e.g. executing some SQL script on a remote SQL server to select or update 1000 of records, the network card stops working. I.e. suddenly, No network connection is present anymore. No internet, no local connection, simply nothing. The only resolution so far I found is to disable my network card and then simply enable it back, like in the following screenshots: 1.) Click "Deactivate" 2.) Click "Activate" (German screenshots only, sorry) Now this is an acceptable solution to work around this issue, but I would love to have this fixed, since it suddenly stops me from working when I'm connected remotely via VPN/RDP on my machine (Win7 64bit). So my question is: Could you imagine a possible cause for this issue and give some hints how to hunt/resolve it? I could imagine that this is a driver issue, a hardware issue or even some kind of background software issue like a software firewall or a virus scanner.

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• Routing subnet over GRE tunnel

  - by eMgz

  Hi, Im trying to configure a GRE over IPSec connection between two subnets. The IPSec tunnel is opened and now I want to add a GRE tunnel over it: ip tunnel add GRE01 mode gre remote 10.244.0.1 local 10.244.245.32 ttl 255 ip link set GRE01 up ip addr add 10.244.248.126 dev GRE01 ip route add 10.244.248.125 dev GRE01 Now I have an interface GRE01 (ifconfig): GRE10 Link encap:UNSPEC HWaddr <h_addr> inet addr:10.244.248.126 P-t-P:10.244.248.126 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MTU:1476 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) And the following routes (ip route list): 10.244.248.125 dev GRE10 scope link <pub_subnet> dev eth0 proto kernel scope link src <pub_ip> default via <pub_gw> dev eth0 metric 100 As a last step, I need now to route my subnet over the tunnel: ip route add 10.245.1.224/28 10.244.248.125 However, I am getting the error Error: either "to" is duplicate, or "10.244.248.125" is a garbage. So, what I didn't understand is why I can't route my subnet over the tunnel, once the only route I have there says that it should route the tunnel IP over the GRE01 interface. Any hint? Thanks.

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• Comprehensive solution for managing patches, event viewing, change management, inventory, etc

  - by Holocryptic

  I'm looking for a solution that incorporates most or all of the following: Patch Management, Server event viewing/tracking, AD change management, ticketing and internal/external kb, remote access - ability to shadow user sessions or create new ones, imaging, and inventory. Our environments contains Windows Servers and ESXi Hosts (We're not completely virtual, but we're moving that direction). Various Cisco and Linksys switches and firewalls. This is a tall order, and I don't know if it can be done on a reasonable budget. I've looked and found some questions on SF that deal with some of this: http://serverfault.com/questions/72015/active-directory-management-tools-for-medium-sized-forest-less-than-1000-users http://serverfault.com/questions/4021/are-there-any-tools-to-do-change-management-with-active-directory-group-policy http://serverfault.com/questions/21752/what-is-a-good-patch-update-management-server What I'm ideally looking for is a reasonably cheap solution that integrates the features into a central interface. We're a non-profit, so money is a limiting factor (the cheaper, the better; but we have a max of $15k). What we are trying to avoid is having to deal with multiple vendors, while maintaining scalability (we're creating more sites that we'll have to manage). Is this possible, or will we have to cobble together something to make it work for us?

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• Slow Local Network, Windows 7, Snow Leopard, WiFi/Wired

  - by WerkkreW

  Hello - I am experiencing really poor local network performance in my home. I was recently using a Linksys WRT54G Router with DD-WRT on it, and a couple comparable Linksys-G PCI cards for connectivity but decided to upgrade hoping it would help with my performance issues. The computers in my house are connected as follows: Comcast Business Class Commercial 25mbps/10mbps (Verified with SpeakEasy and Speedtest.net) D-Link DGL-4500 Wireless N Router Windows 7x64 - D-Link DWA-552 Wireless-N Windows 7x64 - D-Link DWA-552 Wireless-N Mac Mini 10.6.2 - AirPort Extreme N Playstation 3, Hard Wired Xbox 360, Hard Wired Essentially the problem is very specific. Web browsing and uploading/downloading files from the internet is fine, more than fine. But if I want to say, Stream a video from one of my Windows 7 computers to my PS3, or copy a large video file between either of the PC's or the Mac, I get a consistent 500-900Kbps throughput at the high end. If I open my network browser, or try to browse my homegroup the response time is horrible. Both of my Windows computers are showing Strong wireless signals with a connection speed of 300Mbps. I know I can never expect to achieve anything near those speeds, but 500Kbps? Here is what I have tried so far: Enabled Single mode N-only and N/G Only on router WPA2 with AES Encrpytion Disabled "Remote Differential Compression" in Windows 7 Disabled TCP "Auto-Tuning" Used other software for file copies such as "Teracopy" I am at the end of my rope. Unfortunately I live in a 75 year old home with plaster walls, so hard-wiring my entire house isn't really an option I can handle right now. Any ideas to help me get decent speed when transferring files across my network would be greatly appreciated.

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• How do I clear out the ssh-agent entries (on Mac OS X )?

  - by cwd

  I'm running Mac OS X, and it appears that after SSHing to several machines, using identity files, my 'ssh-agent' builds up a lot of identity / keys and then sometimes offers too many to a remote machine, causing them to kick me off before connecting: Received disconnect from 10.12.10.16: 2: Too many authentication failures for cwd It's pretty obvious what's happening, and this page talks about it in more detail: SSH servers only allow you to attempt to authenticate a certain number of times. Each failed password attempt, each failed pubkey/identity that is offered, etc, take up one of these attempts. If you have a lot of SSH keys in your agent, you may find that an SSH server may kick you out before allowing you to attempt password authentication at all. If this is the case, there are a few different workarounds. Rebooting clears the agent and then everything works OK again. I can also add this line to my .ssh/config file to force it to use password authentication: PreferredAuthentications keyboard-interactive,password Anyhow, I saw the note on the page I referenced talking about deleting keys from the agent, but I'm not sure if that applies on a Mac since they appear to be cleared after reboot anyhow. Is there a simple way to clear out all keys in the 'ssh-agent' (the same thing that happens at reboot)?

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