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• Best Practice for captcha based protection against D.O.S to Nginx Proxy

  - by user325320

  The idea is explained here In simple words, Nginx Proxy plays the role of load balance and transmits the HTTP/HTTPS requests to servers. If the number of request times within a certain period from an individual IP exceeds a threshold, it will trigger a captcha for the upcoming requests. And the end-user must input the correct captcha code before he can continue to access the site. Do you know any open source / free NGINX module for this usage? I searched on the Internet and here is one of them: https://github.com/snbuback/nginx seems it needs modification. Any suggestion / experience is welcome, thank you

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• Cisco ASA log error "regular translation creation failed for icmp ..."

  - by Martijn Heemels

  Every few seconds our new Cisco ASA 5505 firewall is logging errors that I can't figure out with my limited Cisco experience. Severity Date Time Syslog ID Source IP Destination IP Description 3 Mar 25 2010 17:21:14 305006 8.8.8.8 regular translation creation failed for icmp src inside:10.10.0.200 dst outside:8.8.8.8 (type 3, code 3) 3 Mar 25 2010 17:18:37 305006 8.8.4.4 regular translation creation failed for icmp src inside:10.10.0.200 dst outside:8.8.4.4 (type 3, code 3) The logged inside IP is our internal DNS resolver, and the outside IP's are Google's public DNS servers. ICMP Type 3 Code 3 means "Port Unreachable" Our "outside" interface has a fixed IP and our "inside" interface is in the 10.10.0.0/16 subnet. The 'Inspect DNS' Service Policy is enabled, with the preset DNS inspection map. Furthermore there's an ACL that allows all inbound ICMP on the "outside" interface. I've spent hours trying to figure this one out, so any and all advice is welcome!

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• 'Certificate types are not available' When creating computer certificate?

  - by Anicho

  Environment Windows Server 2008 sp1 Xeon CPU E5430 @ 2.66 GHz 16.0 GB Ram 64-bit Operating System 1TB Disk Space Server Role: SQL Server Other Information: Joint to domain, Logged in user domain administrator Issue Steps that cause issue: Create a computer certificate using mmc snap-in 'certificates' by right clicking on 'Certificates' folder Under 'root\Personal' tree, and clicking All Tasks - Request New Certificate. Certificate Enrollment window appears, you verify you are connected to your network and you are logged onto the domain. Then Click Next, which leads to a window stating the issue: "Certificate types are not available" "You cannot request a certificate this time because no certificate types are available. If you need a certificate contact your administrator." Wanted Solution Create a certificate on this server, to implement SSL connection to MSSQL servers.

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• Using a Dell DRAC virtual console through a NAT firewall

  - by jetboy

  I have two Dell Poweredge R210 servers, both running Ubuntu 10 Server x64. Server A has a Dell DRAC ILO card (on 172.16.96.91), and both the server and the DRAC use Server B as a gateway (with server B's WAN IP being xxx.xxx.xxx.xx). Server B uses the following NAT rules in IPTables to route traffic through to Server A's DRAC: *NAT --append PREROUTING --in-interface eth1 --protocol tcp --destination xxx.xxx.xxx.xx --destination-port 8019 --jump DNAT --to-destination 172.16.96.91:443 --append POSTROUTING --out-interface eth1 --jump SNAT --to-source xxx.xxx.xxx.xx This works fine for accessing Server A's DRAC via Server B, apart from the Java virtual console. This fails with the following error: com.sun.deploy.net.FailedDownloadException: Unable to load resource: https://xxx.xxx.xxx.xx:443/software/avctKVM.jar at com.sun.deploy.net.DownloadEngine.actionDownload(Unknown Source) etc. I know that the Java console uses port 5900, and possibly ports 83 and 5891. Can anyone help me in getting this working?

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• Install server 2012 on HP ML110 G7 with B110i controller, no disks found

  - by Molotch

  I'm trying to install Server 2012 on a HP ML110 G7 with a B110i controller and four non hot-swappable SATA drives. I just can't get the Server 2012 boot disk PE environment to find any disks. I have downloaded the latest SPP (Service Pack for Proliant 2012.10) and flashed the BIOS. I have tried two different HP drivers for B110i and Windows X64, 6.18.0.64 and 6.18.2.64 to no avail. I have tried setting the controller to both AHCI and legacy mode in the BIOS, no difference. HP:s SmartStart disc for G7 servers only support installation of up to Windows Server 2008R2. HP:s installation instructions for Server 2012 Essentials says boot from the windows disk and use the storage drivers found on the SPP (I can't find any storage drivers on the SPP disk).

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• Windows 2008 DFS Replication Issue

  - by e0594cn

  We have two Server 2008 R2 servers running DFS-R (named dfs01 and dfs02) in a 2008 R2 Domain. Today I found the files in server dfs01 can not be replicated to dfs02. So I used the command dfsrdiag backlog /rgname:<group> /rfname:<folder> /sendingmember:dfs01/receivingmember:dfs02 to check the backlog. After executing the command, I get the following error: Failed to execute GetVersionVector Method. Err: -2147217406 <0x80041002 operation Failed. How can I resolve this?

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• Running Firewall (IPCop) on Hyper-V

  - by Loren Charnley

  I currently use IPCop for our corporate firewall & VPN. I am looking to consolidate a number of servers, and am considering including the firewall server in the consolidation. I currently plan on using Server 2008 with Hyper-V for the virtualization. Has anyone out there tried virtualizing IPCop? Is there anything that I should be aware of? In particular, IPCop has somewhat limited hardware support for NICs - what hardware will the VM see for the network card?

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• Can't access dfs namespace over vpn

  - by cpf

  I've recently configured 2 servers in AD on the same domain level. They are physically separated and permanently connected through a site-to-site vpn for dfs replication. All well, but when users connect to either site through vpn (from home e.g.) they can't use the domain level method: \\domain.com\data Internally this works perfectly, resolving domain.com when connected through vpn gets the correct IP. I've tried Google to figure things out. What I was able to find was that more people have this issue, no real solution found though. Can anyone explain why this is happening? Especially a solution would be really helpful! Thanks in advance.

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• "this network location can't be included because it is not indexed" on Windows 2008R2 Remote Desktop

  - by crgnz

  I'm setting up a new terminal server for our users on Win2008R2 (I guess I should call it Remote Desktop Services now!) When I try to change the location of "Documents" (by removing the default Documents library and adding a new one), to use the file server ie \\fileserver\username\Documents I get the message: "This network location can't be included because it is not indexed" I certainly don't want to make folders available offline, and in fact, I have set the GPO to prohibit offline folders on the terminal servers. What is the best practice for document libraries on terminal server and network file shares?

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• DNS query appending parent suffix twice

  - by sjw

  We're having an issue with DNS clients not being able to resolve certain FQDNs. Within the same domain in which the problem occurs, doing an nslookup against a host name works. However, an nslookup against the hostname.domain.parentdomain1.parentdomain2.net doesn't work. Weird, from outside that domain, the same FQDN query works. Clients in both domains are using the same DNS servers, which are in the "parentdomain1" example. The nslookup comes back with: Non-authoritative answer: Name: hostname.domain.parentdomain1.parentdomain2.net.parentdomain2.net Address: 209.62.20.188 So, the client is appending the "parentdomain2.net" twice. Would appreciate any assistance.

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• .NET Framework 4 updates breaking MMC.exe and other CLR.dll Exceptions

  - by Fox

  I've seen this issue floating around the net the last few weeks and I'm facing exactly the same issue. My servers are set to auto install updates using Windows update (not clever, I know), and since about 2 months ago, I've been getting strange Exceptions. The first thing that happens is that MMC.exe just crashes randomly and sometimes on startup of the console. The exception in the Windows Application log is as follow: Faulting application name: mmc.exe, version: 6.1.7600.16385, time stamp: 0x4a5bc808 Faulting module name: mscorwks.dll, version: 2.0.50727.5448, time stamp: 0x4e153960 Secondly, on the same server, I have some custom Windows services which constantly crash with exceptions : Faulting application name: Myservice.exe, version: 1.0.0.0, time stamp: 0x4f44cb11 Faulting module name: clr.dll, version: 4.0.30319.239, time stamp: 0x4e181a6d Exception code: 0xc0000005 Fault offset: 0x000378aa The exception is not in my code. I've tested and retested it. My server has the following .NET Framework updates installed: Does anyone have any idea?

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• SMB shared folder error when creating additional share on our SAN

  - by jherlitz

  Okay, we have a SAN using Failover Cluster Management on a pair of 2008 servers. We created shares on here before and they are usable. Now when I go to create a new share I get the following error message: "Flags for the SMB Shared folder cannot be configured. This shared resource does not exist" Does not allow me to create the share then. Haven't been able to find any good docs out there to help me through this error. Any advice would be appreciated.

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• Cannot start serial over lan on iDrac6

  - by Bryan Agee

  I have a couple of Dell R610/R710 servers loaded with iDrac6 system management boards. I figured out how to log into the SM CLP with ssh. According to the dell documentation, I should be able to start a console session by running: start /system1/sol1 but I get the following failure message: cmdstat status : 3 status_tag : COMMAND EXECUTION FAILED job job_id : 12 joberr errtype : 1 errtype_desc : Other cimstat : 6 cimstat_desc : CIM_ERR_NOT_FOUND severity : 2 severity_desc : Low /system1/sol1 started FAILED at Sun Sep 16 00:20:58 2012 I have enabled the serial-over-lan via the web interface and rebooted, but nothing seems to make them available.

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• filezilla Command: MLSD Response: 500 Error: Failed to retrieve directory listing

  - by solomongaby

  Hello, Recently our network was moved to the corporate network and behind the company firewall. Since the i could not access the FTP Servers using Filezilla. I can connect to them but cannot receive the directory listing. Command: MLSD Response: 500 Error: Failed to retrieve directory listing I can access the server using other softwares ( GnomeCommander ) but i would like to use Filezilla for its advanced features. I tried active and pasive mode but that doesnt work. I trace the problem to the MSLD command. I think if i could make filezilla use LIST command it will work. Any ideeas. Thanks.

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• How to target SCOM 2007 R2 monitor to monitor only one server

  - by Trondh

  Hi, This might be basic, but hopefully someone can help me: We have a well-working SCOM 2007 R2 implementation monitoring our Microsoft infrastructure. Now, on one of these servers there's an event (logged to the eventlog) that I need to be alerted on. I have created a group and put this one windows server in it. Then, I created a monitor with simple event detection, entered the event id and used the group name as "monitor target". This doesnt work - the monitor doesn't show up in health explorer at all. However, If I create the monitor with "Windows computers" as target it works, but that means I'll have to disable the monitor, and then enable it for the group, which is cumbersome and slightly illogical to me. Is this by design, or am I doing something wrong?

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• Rewrite rules doesn’t work apache 1.3

  - by Sander Versluys

  I'm using a couple of rewrite directives that always works before on apache2 but now i'm trying new a shared hosting and the rewrite rules do not seem to get applied. I've reduced the .htaccess files to the following essential rules: RewriteEngine On Rewritebase /demo/ RewriteRule ^(.*)$ index.php/$1 [L] As you can see, i want to rewrite every request to my index.php file in the demo folder from root. So everything like http://www.example.com/demo/albums/show/1 should be processed by http://www.example.com/demo/index.php for a standard MVC setup. (I'm using CodeIgniter btw) The directives above results in a 500 error, so i thought maybe because of some possible syntax differences between 1.3 and 2.x. After some trail and error editing, i've found the rewrite rule itself to be at fault but i really don't understand why. Any ideas to why my rewrite rule doesn't work? it did before on lots of different servers. Suggestions how to fix it? Note: mod_rewrite does work, i've written a small test to be sure

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• MSDTC - Communication with the underlying transaction manager has failed (Firewall open, MSDTC netwo

  - by SocialAddict

  I'm having problems with my ASP.NET web forms system. It worked on our test server but now we are putting it live one of the servers is within a DMZ and the SQL server is outside of that (on our network still though - although a different subnet) I have open up the firewall completely between these two boxes to see if that was the issue and it still gives the error message "Communication with the underlying transaction manager has failed" whenever we try and use the "TransactionScope". We can access the data for retrieval it's just transactions that break it. We have also used msdtc ping to test the connection and with the amendments on the firewall that pings successfully, but the same error occurs! How do i resolve this error? Any help would be great as we have a system to go live today. Panic :)

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• Renci.SSHNet and HP ILO 4

  - by Andrew J. Brehm

  I am using Renci.SSHNet to connect to HP iLO processors. Generally this works fine and I can connect and run several commands and disconnect. However, I noticed that a few new servers that use iLO 4 simply don't react to any but the first command sent. When I login using Putty everything works fine, but when using an SSH connection with Renci only the first command sent is recognised whereas the second and further commands do not cause any reaction whatsoever by the iLO processor, not even an error message. Any ideas why that might be?

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• Unable to make admin interface connection to server when moving a mailbox.

  - by TheCodeMonk

  I have an existing Exchange 2003 server running on Windows Server 2003. I am in the process of replacing our current server infrastructure and virtualizing it all in Hyper-V. I have Essential Business Server 2008 installed in 3 separate VMs and running. Everything seems to be working fine so far. I am now trying to migrate my exchange mailboxes over to the new exchange server in the messaging server and every time I try I get this error: MapiExceptionNetworkError: Unable to make admin interface connection to server. (hr=0x80040115, ec=-2147221227) I have done some searching and found solutions like adding the computer to the exchange domain servers groups and install group, also making sure the user logged into the new server is in the proper groups. I also saw a solution in making sure that any unused NICs are disabled. I've tried all that to no avail.

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• Project Server 2010 Beta - can't connect Project client to projects hosted on server

  - by Chris W

  We have a Project 2010 Beta installed on SharePoint 2010 Beta as test set-up whilst we wait for the release versions. Whilst the installation seemed to complete without any issues we're unable to open any projects within the Project 2010 client app. Project pops up an error 'Could not retrieve server initialization data'. My local event logs list some errors from MSSOAP that simply state an unanticipated error occurred during the processing of the request. The server doesn't log any errors. The Sharepoint set up is a farm containing 3 SharePoint servers. I log in to server 'PORTAL' but the Project Server stuff is configured to run on one of the other SharePoint boxes. I presume others have managed to get this working - has anyone got any ideas as to what could be wrong. Everything is patched correctly as far as I can tell.

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• Reporting Services Returning HTTP 401 Unauthorized

  - by Chris Arnold

  I have just ported an existing ASP.NET application to a new web server (Windows Server 2008 R2 and SQL Server 2008). It is successfully running on 4 other servers of varying O/S (which I also setup). My ASP.NET app calls into the Reporting Services Web Service (ReportExecution2005.asmx) to generate a report and save it as a pdf to the file system. I consistently receive "System.Net.WebException - The request failed with HTTP status 401: Unauthorized." In UTTER desperation I have performed the following... Granted all Users complete access to SSRS via the Reports web page. Granted all Users 'Full control' to <%ProgramFiles%\Microsoft SQL Server\MSRS10.MSSQLSERVER I am not a network / server specialist but I'm the only one that can deal with this and it's driving me batty. Help!

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• Windows Server 2003 Terminal Server with installed licenses will not go beyond 2 connections

  - by Erwin Blonk

  I installed the Terminal Server role in Windows Server 2003 Standard 64-bits. Still, only 2 connections are allowed. The License Manager says that there are 10 Device CALs available, which is correct, and that none are given out. For good measure I let the server reboot, to no effect. Before this, there was another server (same Windows, except that it is 32 bits) active as a licensing server. I removed the role first and then then added it to the new server. I then removed the Terminal Server Licensing Server component off the old one and added it to the new one. After that, I added to licenses. When that didn't give the required result, I rebooted to new server. Still, the new server, with licenses and all, acts as if it has the 2 license RDP. The server are all stand-alone, there is no active directory been set up. Both servers are in different workgroups.

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• Linux Server Performance Monitoring

  - by Jon

  I'm looking to monitor performance on my Linux servers (which happen to be Centos). What are the best tools for monitoring things in realtime such as: Disk Performance I/O, swapping etc.. CPU Performance Looking for low level tools, rather than web based tools such as Nagios, Ganglia etc... n.b. I'd like to know exactly what each tool does rather than just having a list of random toolnames if possible please. Why the tool is a better option than others would be good also.

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• HyperV on Domain Controller or DC on HyperV?

  - by Michael Stum

  I want to setup a little fileserver/domain controller/sharepoint server. SharePoint shouldn't run on the DC directly, so I want to use HyperV. But I never used it before, so I wonder: Should I install the Domain Controller and HyperV Role and run 1 VM for SharePoint? Or should I run HyperV server and then 2 servers, one for SharePoint and 1 for DC? Usage is minimal with only 1 user. Hardware will be an Athlon II X3 with 3x2.9 GHz and 4 GB RAM. Operating System will be Server 2008 R2 Standard in all cases.

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• Any problems usinga GoDaddy SSL certificate on a Cisco ASA firewall?

  - by Richard West

  I need to purchase and install a SSL certificate on my Cisco ASA firewall. This will allow my VPN users to connect to my ASA without receiving the certificate error from the untrusted self assigned SSL certificate that is currently on the ASA. I had good experiences with the SSL certificates that GoDaddy sells. However, I'm concerned about using them. On my web servers I have to also install GoDaddy's "intermediate certificate bundle". On the ASA I do not think that I will be able to preform anything like this. I do not fully understand what the "intermediate certificate bundle" does, but obviously it's important. So my question is can I use a GoDaddy SSL certificate on an ASA without my users getting any type of warning or error about connecting to a site that using an untrusted SSL certificate. I need this to be as simple as possible for my end users and warning messages are always scary :) Thanks!

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