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• Network connection keeps dropping - bad hardware?

  - by Bill Sambrone

  Hello all, I've into a bit of a wall with a client of mine. In an office of 20 people, he is the only one who experiences broken connections to his mapped network drives. I have everyone set up with about 6 mapped drives, all pointing to the same server (no DFS), and everyone else can access them lightning fast. The environment consists of a mix of Windows 7 and XP machines, all 32-bit. The server holding the data everyone is mapping to is running on Server 2008 R2, and is a domain controller. We recently swapped out their old 10/100 switch for a shiny new Dell PowerConnect gigabit switch. We have also replaced an old dying Sonicwall with a shiny new one. Everything is running on an ESX host except for the DC, where everyone is getting data from. In my client's office, we have done the following: Swapped out his computer (Win7 and XP box) Swapped out the desktop switch in his office Removed the desktop switch in his office Changed out the network cable going to the wall Ran 'net config server /autodisconnect:-1' on the server Disabled remote differential compression on his current Win7 box When we swapped out his network cable, everything seemed fine for about 4 days. Normally I would get a phone call a couple times per day letting me know that Outlook has crashed (there is a 9GB PST living on the server he is always connected to), or that his software he is running from his L drive has crashed. I almost thought I had this solved, but after we rebooted the DC the other night he all of a sudden couldn't stay connected to his mapped network drives for more than 10 minutes. When I ran 'net use' from the command prompt, it listed all the network drives where were randomly in a state of 'OK', 'Disconnected', or 'Reconnecting'. What else should I try? Maybe there is bad wiring in the wall, patch panel, or a bad port in the new switch I have in the server room?

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• IIS replication - Is it possible

  - by Ian

  Hi All, I have a requirement for a client that I have a centralised system that all his satellite branches can work on. Currently this is a ASP.net web forms app running under IIS 7 on win 2008 RC 2 using an SQL backend. The client has now requested that each branch have a local server, so that in the event that the internet connection is down, the branches productivity does not suffer. His other request is that everything can be updated via the central hub and using some mechanism the updates filter down to the individual sites. What are my options here? I see the following as possible options: Multiple redundant internet connections controlled by load balancers SQL replication for the DB (What is better, snapshot, merge or transactional) Roll my own IIS sync service the periodically checks if there is a new version of the web app and downloads it (I hope there are better option than this) Something way better I don’t yet know about (I hope this is the one I need) One of my clients concerns are that the branches are often in very remote areas where everything from technicians to internet is hard to find and very scarce. Any ideas, suggestions, tips etc are welcome. Thanks all

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• Use subpath internal proxy for subdomains, but redirect external clients if they ask for that subpath?

  - by HostileFork

  I have a VirtualHost that I'd like to have several subdomains on. (For the sake of clarity, let's say my domain is example.com and I'm just trying to get started by making foo.example.com work, and build from there.) The simplest way I found for a subdomain to work non-invasively with the framework I have was to proxy to a sub-path via mod_rewrite. Thus paths would appear in the client's URL bar as http://foo.example.com/(whatever) while they'd actually be served http://foo.example.com/foo/(whatever) under the hood. I've managed to do that inside my VirtualHost config file like this: ServerAlias *.example.com RewriteEngine on RewriteCond %{HTTP_HOST} ^foo\.example\.com [NC] # <--- RewriteCond %{REQUEST_URI} !^/foo/.*$ [NC] # AND is implicit with above RewriteRule ^/(.*)$ /foo/$1 [PT] (Note: It was surprisingly hard to find that particular working combination. Specifically, the [PT] seemed to be necessary on the RewriteRule. I could not get it to work with examples I saw elsewhere like [L] or trying just [P]. It would either not show anything or get in loops. Also some browsers seemed to cache the response pages for the bad loops once they got one... a page reload after fixing it wouldn't show it was working! Feedback welcome—in any case—if this part can be done better.) Now I'd like to make what http://foo.example.com/foo/(whatever) provides depend on who asked. If the request came from outside, I'd like the client to be permanently redirected by Apache so they get the URL http://foo.example.com/(whatever) in their browser. If it came internally from the mod_rewrite, I want the request to be handled by the web framework...which is unaware of subdomains. Is something like that possible?

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• Simple way to set up port knocking on Linux?

  - by Ace Paus

  There are well known benefits of Port Knocking utilities when utilized in combination with firewall IP table modification. Port Knocking is best used to provide an additional layer of security over other tools such as the OpenSSH server. I would like some help setting it up on a ubuntu server. I looked at some port knocking implementations here: PORTKNOCKING - A system for stealthy authentication across closed ports. IMPLEMENTATIONS http://www.portknocking.org/view/implementations fwknop looked good. I found an Android client here. And fwknop (both client and server) is in the ubuntu repos. Unfortunately, setting it up (on the server) looks difficult. I do not have iptables set up. My proficiency with iptables is limited (but I understand the basics). I'm looking for a series of simple steps to set it up. I only want to open the SSH port in response to a valid knock. Alternatively, I would consider other port knocking implementations, if they are much simpler to set up and the desired Linux and Android clients are available.

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• Generalized strategy for file server virtualization in Xenserver

  - by Jamie

  I'm not shopping as much as I'm looking for some guidance on good idea / bad idea strategies. I'm sure I'm not in the "best practices" budget range. Currently, I have 3 dell poweredges running xenserver in a pool. Each node has a ubuntu file server, serving about 6TB. One is the primary, the other two are rsync targets for backup. The 6TB is stored on their respective local storage disks as an LVM of 3x2tb virtual disks. The fileserver VM disks are also stored on the node local disks. Each node also runs a smattering of light-weight VMs for web, development, windows VMs, and stuff like that. Several of those VM's disks reside on a QNAP NAS to play with live migration. These VM's are often clients of the primary file server (like all the mail, web content, user files are stored on the file server, not on the mail, web, and samba VMs). This all works fine, and is a major step up for us. The downside is that the QNAP is a single point of failure. And the only thing the QNAP is doing is serving migratable VM images, not client data. Someday the poweredge local arrays will be full, and we will have to reinvent ourselves again. Is it wise to have heavywieght vms (like the fileserver, with its 6+ TB disks) on a SAN or NAS? Would it be better to keep the VMs lightweight, have the VM images on a SAN or NAS, and use 2 or more NAS act as NFS-serving file appliances? A hybrid SAN/NAS that can serve iscsi for images and NFS for the client vms? It seems like live-magration would be a misnomer if you have to migrate a fileserver with its entire 6+ TB disk. I recognize there are plenty of ways to skin the cat. We've already skinned it a few ways. What makes sense?

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• Vlan on DD-WRT v24 filesharing without internet

  - by user148888

  I'm planning to do a vlan with shared files without internet. my vlan is working correctly until I could lock the internet but I can not share files only I can ping from 172.168.1.x to 172.168.2.x but not backward. can u help me please?? This is my config. WRT54g DD-wrt v24 vlan0 eth 1,2,3 172.168.1.1/24 vlan1 Wan vlan2 eth 4 172.168.2.1/24(don't want internet here just Lan Conection) Pc (my pc) 172.168.1.10/24 gtway 172.168.1.1 (with internet) Ubiquity Nanostation loco M2 172.168.2.20/24(AP)(connect to eth 4 vlan2)(don't want internet here) Ubiquity Nanostation loco M2 172.168.2.21/24(Client)(don't want internet here) Friend pc 172.168.2.115/24(connected from the client)(don't want internet here) Any Help Please.. ![Lan Map][1] ![Vlan Config1][2] ![Vlan Config2][3] ![Vlan Config3][4] ![Command to block internet][5] [url=http://imageshack.us/photo/my-images/194/lanxl.jpg/][img=http://imageshack.us/a/img194/4197/lanxl.th.jpg][/url] [url=http://imageshack.us/photo/my-images/600/commandmf.jpg/][img=http://imageshack.us/a/img600/9530/commandmf.th.jpg][/url] [url=http://imageshack.us/photo/my-images/811/57398524.jpg/][img=http://imageshack.us/a/img811/1917/57398524.th.jpg][/url] [url=http://imageshack.us/photo/my-images/717/48064277.jpg/][img=http://imageshack.us/a/img717/829/48064277.th.jpg][/url] [url=http://imageshack.us/photo/my-images/685/21456517.jpg/][img=http://imageshack.us/a/img685/256/21456517.th.jpg][/url]

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• Queries passed to SQL Server are getting corrupted

  - by adrianbanks

  We are experiencing a bizarre error with our application at a customer site. We have managed to narrow it down to the point where we can replicate the behaviour using just Management Studio and SQL Server. We have two machines, A and B: +------------+ +--------------------+ | [A] | | [B] | | Management | -------------- | SQL Server 2008 R2 | | Studio | | Enterprise x64 | +------------+ +--------------------+ We are running a SQL script in Management Studio on machine A against the SQL Server instance on machine B. We are not actually executing the script, just parsing it. Most of the time, the parse operation works fine. Occasionally (seemingly randomly), the parse operation fails with a syntax error. The error message shows the part of the script with the error, which appears as some SQL from the original script that has been truncated and has random characters appended to it. An example: The original SQL: SELECT DISTINCT ST.TABLE_NAME as TableName FROM INFORMATION_SCHEMA.TABLES AS ST INNER JOIN INFORMATION_SCHEMA.COLUMNS AS SC ON SC.TABLE_NAME = ST.TABLE_NAME WHERE ST.TABLE_TYPE = 'BASE TABLE' AND SC.COLUMN_NAME = 'Identity' AND ST.TABLE_NAME != 'dtproperties' ORDER BY ST.TABLE_NAME The SQL that is in error (as reported by SQL Server): SELECT DISTINCT ST.TABLE_NAME as TableName FROM INFORMATION_SCHEMA.TABLES AS ST INNER JOIN INFORMATION_SCHEMA.COLUMNS AS SC ON SC.TABLE_NAME = Sa? The above example shows how the query is being corrupted. It doesn't always happen, and is not always the same bit of SQL that causes the error. Parsing this script against another SQL Server instance produces no errors, showing that the script is fine. It appears that something is corrupting the SQL that is being received the the server. This leads me to think that the problem lies either with the client end or in the transmission of the SQL from the client to the server. I have a SQL trace from the period where an error occurs, which shows the SQL has been corrupted when SQL Server receives it. We have been unable to track down any possible cause of this behaviour, and so cannot find a fix. Because the errors occur seemingly randomly, it is also very hard to generate reproduction steps to submit a bug report. Any ideas?

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• SWATCH - what am I doing wrong?

  - by Brian Dunbar

  What I want/need/desire is to log when a user logs into my FTP server. Problem: I can't make swatch work the way I should be able to. This data is logged to a file - but of course these logs are not kept very long. I can't keep the logs around forever, but I can extract data from then, analyze it, store results elsewhere. If there is a better way to do this than the following, I'm all ears. Swatch version 3.2.3 Perl 5.12 FTP: VSFTP OS (Test): OS X 10.6.8 OS (Production): Solaris From man I see I can pass contents to a command .. so I should be able to echo those values to file, do a sed/cut/uniq thing on them for stats. $ man swatch (snip) exec command Execute command. The command may contain variables which are substituted with fields from the matched line. A $N will be replaced by the Nth field in the line. A $0 or $* will be replaced by the entire line. Swatch file .swatchrc watchfor /OK LOGIN/ echo=red pipe "echo "0: $0 1:$1 2:$2 3:$3 4:$4 5:$5" >> /Users/bdunbar/dev/ftplog/output.txt" Launch with $ swatch -c /Users/bdunbar/.swatchrc --script-dir /Users/bdunbar/dev/ftplog -t /Users/bdunbar/dev/ftplog/vsftpd.log & Test echo "Mon July 9 03:11:07 2012 [pid 14938] [aetech] OK LOGIN: Client "206.209.255.227"" >> vsftpd.log Results - it's echoing to TTY. This is not needed or desired on the server, but it does tell me things are working. ftplog *** swatch version 3.2.3 (pid:25780) started at Mon Jul 9 15:23:33 CDT 2012 Mon July 9 03:11:07 2012 [pid 14938] [aetech] OK LOGIN: Client 206.209.255.227 Results - bad! I appear to not be sending the variables to text. $ tail -f output.txt 0: /Users/bdunbar/dev/ftplog/.swatch_script.25780 1: 2: 3: 4: 5:

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• How to stop NAT dropping idle connections?

  - by WGH

  I have a TCP connection that can be idle for many hours. The traffic is flowing from the server to the client only. One might say it's kind of push notification. My home router, however, tends to drop the connection silently after 20 minutes (the value of /proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established). The server detects the loss once it tries to send anything (I assume it receives RST from the router itself). As client never sends anything, it never detects the loss. RFC 5382 "NAT Behavioral Requirements for TCP" states the following: A NAT can check if an endpoint for a session has crashed by sending a TCP keep-alive packet and receiving a TCP RST packet in response. It makes sense. It's much more effective than sending keep-alives by the host itself (as only NAT knows its own timeout). And probably not hard to implement. Is there any NAT solutions implementing this? It would be great if there was a way to enable this in iptables.

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• Connect to WEP Wireless Network by command line on Ubuntu

  - by Tim

  Hi, I am a newbie to both network and Linux. I am now trying to connect to a WEP wireless network by command line on my Ubuntu 8.10, because the Network Manager does not support 64 bit WEP. (1) I firstly bring down the Network Manager and then try to connect to a wireless network, whose essid is candy and password is 5673212741. But it fails as shown in the following. I wonder why and how to do it correctly? $ sudo /etc/init.d/NetworkManager stop * Stopping network connection manager NetworkManager [ OK ] $ sudo iwconfig wlan0 essid candy opendo iwconfig wlan0 key 18018ce78e open $ sudo iwconfig wlan0 key 5673212741 open $ sudo dhclient wlan0 There is already a pid file /var/run/dhclient.pid with pid 9971 killed old client process, removed PID file Internet Systems Consortium DHCP Client V3.1.1 Copyright 2004-2008 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ wmaster0: unknown hardware address type 801 wmaster0: unknown hardware address type 801 Listening on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on LPF/wlan0/00:0e:9b:cd:4e:18 Sending on Socket/fallback DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 7 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 12 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 20 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 13 DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 9 No DHCPOFFERS received. No working leases in persistent database - sleeping. $ ping www.bbc.co.uk ping: unknown host www.bbc.co.uk (2) A less important question: why the scan for wireless networ does not work after I bring down the Network Manager? $ sudo /etc/init.d/NetworkManager stop * Stopping network connection manager NetworkManager [ OK ] $ sudo iwlist wlan0 scan wlan0 Interface doesn't support scanning : Network is down Thanks and regards!

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• Can't use command line – "command not found" after editing PATH

  - by MEM

  I'm running OS X Mavericks and was trying to install MAMP PRO 2.2. I was trying to configure the PATH variable to have the PHP binaries of MAMP PRO. I added the following line on my ~/.bash_profile file: export PATH=/Applications/MAMP PRO/bin/php/php5.5.3/bin:$PATH As you may notice, since I have MAMP PRO and not just MAMP, I've added a space. As a consequence, I know have the following error each time I run the terminal: -bash: export: `PRO/bin/php/php5.5.3/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin': not a valid identifier Worst: I can't get any command to run, like: ls, clear etc. I always get: "command not found" I don't even know the absolute path for ls. How can I make the commands work again, so that I can properly fix the path I was trying to setup on the .bash_profile file?

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• How do I configure VMware View location-based printing to use Active Directory Groups?

  - by Jason Pearce

  I am attempting to configure VMware View 4.5's Location-Based Printing, which leverages an included OEM version of ThinPrint, to assign printers to active directory groups. The location-based printing feature maps printers that are physically near client systems to VMware View desktops. I am using the Active Directory group policy setting AutoConnect Location-based Printing for VMware View, which is located in the Microsoft Group Policy Object Editor in the Software Settings folder under Computer Configuration. The AutoConnect Location-based Printing for VMware View appearst to be just a name translation table. It permits me to assign a specific printer or printers to an IP Range, Client Name, Mac Address, User, or User Group. I'm attempting to assign printers to active directory user groups. I have created a new active directory group for each printer that I intend to use in VMware View desktop pools. I will then assign active directory users to the active directory groups that represent each network printer. Example: doej is a member of the PTR-FLOOR2-NORTH-ROOM255 active directory group. Using AutoConnect, I assigned the group to receive a network printer by adding PTR-FLOOR2-NORTH-ROOM255 in the User/Group column. Problem: When doej logs in to his VDI session, the printer is not present. However, if I use a wildcard "*" in the User/Group column instead of the specific PTR-FLOOR2-NORTH-ROOM255 active directory group, the printer is present and functions as designed. Alternatives: I have tried assigning printers to active directory groups within AutoConnect in the following ways, all unsuccesfull: PTR-FLOOR2-NORTH-ROOM255 domainexample\PTR-FLOOR2-NORTH-ROOM255 domainexample.local\PTR-FLOOR2-NORTH-ROOM255 Confirmation: The information used to map the printer to the VMware View desktop is stored in a registry entry on the View desktop in HKEY_LOCAL_MACHINE\SOFTWARE\Policies\thinprint\tpautoconnect. For each of these examples, I have reviewed the registry entry and can confirm that the desktop is receiving the information from the AutoConnect translation table. Summary: Can anyone provide an example of how to configure VMware View 4.5's Location-Based Printing so that I may assign network printers to active directory groups via the included AutoConnect tool? I would welcome a clear example of a working configuration. Thank you.

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• Can SSH into remote server but can't SCP?

  - by ArtfulDodger2012

  I can SSH into remote server just fine using private key authentication with prompt for passphrase. However I'm getting permission denied when I try to SCP a file using the same passphrase. Here's my output: $ scp -v [file] [user]@[remoteserver.com]:/home/[my dir] Executing: program /usr/bin/ssh host [remoteserver.com], user [user], command scp -v -t /home/[my dir] OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /home/[my dir].ssh/config debug1: Applying options for [remoteserver.com] debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to [remoteserver.com] [[remoteserver.com]] port 22. debug1: Connection established. debug1: identity file /home/[user]/.ssh/aws_corp type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3p1 Debian-3ubuntu7 debug1: match: OpenSSH_5.3p1 Debian-3ubuntu7 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.3p1 Debian-3ubuntu7 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host '[remoteserver.com]' is known and matches the RSA host key. debug1: Found key in /home/[my dir]/.ssh/known_hosts:12 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: /home/[my dir]/.ssh/aws_corp debug1: PEM_read_PrivateKey failed debug1: read PEM private key done: type <unknown> Enter passphrase for key '/home/[my dir]/.ssh/aws_corp': debug1: read PEM private key done: type RSA Connection closed by [remote server] lost connection I've searched for answers but can't find quite the same problem or am just being thick. Either way any help is much appreciated. Cheers!

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• Ngix rewrite is not working as expected

  - by SamFisher83

  I am trying to learn how to use nginx and how to use its rewrite functionality Nginx seems to be doing the rewrite: 2012/03/27 16:30:26 [notice] 16216#0: *3 "foo.php" matches "/foo.php", client: 61.90.22.223, server: localhost, request: "GET /foo.php HTTP/1.1", host: "domain.com" 2012/03/27 16:30:26 [notice] 16216#0: *3 rewritten data: "img.php", args: "", client: 61.90.22.223, server: localhost, request: "GET /foo.php HTTP/1.1", host: "domain.com" but in my access log I am getting the following: 61.90.22.223 - - [27/Mar/2012:16:26:54 +0000] "GET /foo.php HTTP/1.1" 404 31 "-" "Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0" 61.90.22.223 - - [27/Mar/2012:16:30:26 +0000] "GET /foo.php HTTP/1.1" 404 31 "-" "Mozilla/5.0 (Windows NT 6.1; rv:11.0) Gecko/20100101 Firefox/11.0" There is an img.php in the root directory so I am not sure why I am getting a 404 error Here is part of the configuration block: rewrite foo.php img.php last; location / { try_files $uri $uri/ /index.html; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; include fastcgi_params; } # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # location ~ /\.ht { deny all; }

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• Converting a Windows 2003 server

  - by Jim Bass

  We have a legacy database system based upon MS SQL running on Windows Server 2003. The client software will only run on Windows XP. We have recently had success converting a client into a virtual machine and running it under Fusion on Mac minis. So far, it is working incredibly well. So well, in fact, that we are now considering trying to convert the server to a virtual machine. This raises several questions, though: 1. The server uses a raid array. Does the VM virtualize the raid array? I only ask because in my experience Windows products don't like it when you change core hardware. 2. Is there any reason why running SQL server on a virtual machine won't work? It will be up 24/7. 3. Is there a different converter for servers? 4. Will I have to track down the licensing for MS SQL and Server 2003 or will they come across ok? 5. The company that designed the software is no longer in business. There is some fear that the software is somehow tied to the hardware configuration. We bought the hardware, but their engineers came out and configured the system. Will the virtual machine be able to spoof particular chip sets? Thanks! Jim Bass

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• MS Excel and Access - which is better for reports?

  - by Nat

  Where I work, staff have just started to use a basic table in excel (1 october) to record sales which has about 10 columns (name, client, renewed, discount, paid etc). I record the data (total sold etc) every hour and email it to the manager. Each staff has the their own file on the network which they use constantly for that day (eg. John 08-10.xlsx; John 09-10.xlsx etc) and have been told to save the file after they complete a row with client data. I can see the file (in read only mode) to update the report but I am sure there must be a way of doing an autoupdate of their worksheets in real time. I can link worksheets and workbooks to my main workbook but manually. Does anyone have suggestions on have to do this on Excel? Or would Access allow me to make a report which shows the sales total for that hour without the staff closing the file or constantly clicking save every few minutes? We use office 2010. thanks

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• Can't connect to Server Manager from Windows 7

  - by SAdmin317

  I have a Windows 7 Pro 64bit with SP1 desktop that has RSAT tools installed. I opened Server Manager and can't connect to the server (Server 2008 R2 core). I followed the guide to enable everything on the server, added a registry key to enable read-only on the device manager as well. On the Windows 7 PC I turned on winrm, did the quick config, and added the server IP and name as trusted hosts. I still get an error when connecting. "Connecting to the remote server failed with the following error message: The WinRM client cannot process the requests. If the authentication scheme is different from Kerberos, or if the client computer is not joined to a domain, then HTTPS transport must be used or the destination machine must be added to the TrustedHosts configuration setting...." I also added the name of the server to the windows 7 /etc/hosts file. Ping the server name translates to the IP of the server. Also opened up the firewall for "Remote Volume Management" Both machines are on the same Workgroup, using the same Administrator account, with the same password. Any help appreciated.

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• OpenVPN bridge network from routed clients

  - by gphilip

  I have the following setup: subnet 1 - 10.0.1.0/24 with a machine used as NAT and also running an OpenVPN client subnet 2 - 192.168.1/24 with an OpenVPN server (the server in subnet 1 connect here) subnet 3 - 10.0.2.0/24 that uses the NAT machine (subnet 1) to access the internet, so all non-local traffic is routed there to the eth0 interface The OpenVPN client creates the tun0 interface and appropriate routing so that I can access machines from 192.168.1/24 [root@ip-10-0-1-208 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... Connected to 192.168.1.186. Escape character is '^]'. [root@ip-10-0-1-208 ~]# route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0 0 eth0 10.0.1.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0 10.8.0.1 10.8.0.5 255.255.255.255 UGH 0 0 0 tun0 10.8.0.5 0.0.0.0 255.255.255.255 UH 0 0 0 tun0 169.254.169.254 0.0.0.0 255.255.255.255 UH 0 0 0 eth0 192.168.0.0 10.8.0.5 255.255.0.0 UG 0 0 0 tun0 However, when I try the same from subnet 3, it can't reach that machine. [root@ip-10-0-2-61 ~]# telnet 192.168.1.186 8081 Trying 192.168.1.186... I suspect that it's because subnet 3 is routed to eth0 on the NAT machine in subnet 1 and it cannot jump to tun0. What's the easiest way to resolve it? I don't want to use iptables. I can't change the routing from machines in subnet 1 because it's done in AWS and so it works only with specific interfaces. Also, the NAT machine gets its IP with DHCP and so bridging is a bit complicated. IP forwarding is set on the NAT machine [root@ip-10-0-1-208 ~]# cat /proc/sys/net/ipv4/ip_forward 1 Thank you!

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• mod_fcgi produces random 500 Errors

  - by DmitrySemenov

  php 5.4.7 via mod_fcgi when I run the site sometimes it works, sometimes it crashed with 500 Internal Error, this is what I see in error.log everytime I run the script [Mon Sep 24 18:50:43 2012] [warn] [client 68.231.194.198] (104)Connection reset by peer: mod_fcgid: error reading data from FastCGI server [Mon Sep 24 18:50:43 2012] [error] [client 68.231.194.198] Premature end of script headers: api.php any ideas? vhost config: <VirtualHost :80> ServerAdmin [email protected] DocumentRoot "/home/www/sites/test.com/html/development" ServerName test.com ServerAlias www.test.com ErrorLog "/home/www/sites/test.com/logs/error_log" CustomLog "/home/www/sites/test.com/logs/access_log" common <IfModule mod_fcgid.c> <Directory /home/www/sites/test.com/html/development> Options +ExecCGI AllowOverride All AddHandler fcgid-script .php FCGIWrapper /home/www/php-fcgi-scripts/php-fcgi-starter .php Order allow,deny Allow from all </Directory> FcgidMaxRequestLen 1073741824 </VirtualHost> fcgi.d conf LoadModule fcgid_module modules/mod_fcgid.so # Use FastCGI to process .fcg .fcgi & .fpl scripts AddHandler fcgid-script fcg fcgi fpl # Sane place to put sockets and shared memory file FcgidIPCDir /var/run/mod_fcgid FcgidProcessTableFile /var/run/mod_fcgid/fcgid_shm IdleTimeout 300 BusyTimeout 300 ProcessLifeTime 7200 IPCConnectTimeout 300 IPCCommTimeout 7200 PHP_Fix_Pathinfo_Enable 1 php-fcgi-starter.php #!/bin/sh PHP_CGI=/usr/local/php547/bin/php-cgi PHP_INI=/etc/php547-fastcgi.ini export PHP_FCGI_TIMEOUT=1200 #export PHP_FCGI_CHILDREN=6 export PHP_FCGI_MAX_REQUESTS=1000 exec $PHP_CGI -c $PHP_INI

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• Postfix + Exchange + ActiveDirectory; How to mix them

  - by itwb

  My client has got many sub-offices, and one head office. The headoffice has a domain name: business.com All users in the many sub-offices need to have a headoffice email address: [email protected] Anyone not in the head office will need the email forwarded to an external email address. All users in the head office will have their email delivered to Microsoft Exchange. Users are listed in Active Directory under two different OU's: HeadOffice or SubOffice. Is this something able to be configured? I've done some googling, but I can't find any examples or businesses set up this way. Edit: Postfix will accept all email, will need to determine to forward the email to an external account or alternatively have it delivered to MS Exchange. I've done some reading about MS Exchange and that you can 'mail-enable' contacts for forwarding - but I don't know if each AD account requires an Exchange CAL? The end goal is to forward email to external accounts to sub offices or accept email for head office. Maybe I don't need to worry about Postfix to perform this task..... http://www.windowsitpro.com/article/exchange-server-2010/exchange-server-licensing-some-of-your-questions-answered "What about client access licenses (CALs)? You need one CAL per user who will connect to Exchange. Although it might not be 100 percent precise, I prefer to think of it as one CAL per mailbox; there are exceptions for users outside your organization, automated tools that use mailboxes, and so on. Exchange doesn't enforce this limit, so it's on you to ensure that you have the correct number of CALs for the set of clients you support."

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• Password-less login into localhost

  - by Brad

  I am trying to setup password-less login into my localhost because it's required for a tutorial. I went through the normal steps of generating an rsa key and appending the public key to authorized_keys but I am still prompted for a password. I've also enabled RSAAuthentication and PubKeyAuthentication in /etc/ssh_config. Following other suggestions I've seen, I tried: chmod go-w ~/ chmod 700 ~/.ssh chmod 600 ~/.ssh/authorized_keys But the problem persists. Here is the output from ssh -v localhost: (tutorial)bnels21-2:tutorial bnels21$ ssh -v localhost OpenSSH_5.9p1, OpenSSL 0.9.8r 8 Feb 2011 debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to localhost [::1] port 22. debug1: Connection established. debug1: identity file /Users/bnels21/.ssh/id_rsa type 1 debug1: identity file /Users/bnels21/.ssh/id_rsa-cert type -1 debug1: identity file /Users/bnels21/.ssh/id_dsa type -1 debug1: identity file /Users/bnels21/.ssh/id_dsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9 debug1: match: OpenSSH_5.9 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA 1c:31:0e:56:93:45:dc:f0:77:6c:bd:90:27:3b:c6:43 debug1: Host 'localhost' is known and matches the RSA host key. debug1: Found key in /Users/bnels21/.ssh/known_hosts:11 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/bnels21/.ssh/id_rsa debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Offering RSA public key: id_rsa3 debug1: Authentications that can continue: publickey,keyboard-interactive debug1: Trying private key: /Users/bnels21/.ssh/id_dsa debug1: Next authentication method: keyboard-interactive Password: Any suggestions? I'm running OSX 10.8.

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• Why is ssh agent forwarding not working?

  - by J. Pablo Fernández

  In my own computer, running MacOSX, I have this in ~/.ssh/config Host * ForwardAgent yes Host b1 ForwardAgent yes b1 is a virtual machine running Ubuntu 12.04. I ssh to it like this: ssh pupeno@b1 and I get logged in without being asked for a password because I already copied my public key. Due to forwarding, I should be able to ssh to pupeno@b1 from b1 and it should work, without asking me for a password, but it doesn't. It asks me for a password. What am I missing? This is the verbose output of the second ssh: pupeno@b1:~$ ssh -v pupeno@b1 OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to b1 [127.0.1.1] port 22. debug1: Connection established. debug1: identity file /home/pupeno/.ssh/id_rsa type -1 debug1: identity file /home/pupeno/.ssh/id_rsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_dsa type -1 debug1: identity file /home/pupeno/.ssh/id_dsa-cert type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa type -1 debug1: identity file /home/pupeno/.ssh/id_ecdsa-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA 35:c0:7f:24:43:06:df:a0:bc:a7:34:4b:da:ff:66:eb debug1: Host 'b1' is known and matches the ECDSA host key. debug1: Found key in /home/pupeno/.ssh/known_hosts:1 debug1: ssh_ecdsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /home/pupeno/.ssh/id_rsa debug1: Trying private key: /home/pupeno/.ssh/id_dsa debug1: Trying private key: /home/pupeno/.ssh/id_ecdsa debug1: Next authentication method: password pupeno@b1's password:

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• Apache config: Permissions, Directories and Locations

  - by James Murphy

  I'm trying to get my head around apache configuration to fix a problem I'm having but after a few hours I've decided to ask here. This is what I've got at the moment: DocumentRoot "/var/www/html" <Directory /> Options None AllowOverride None Deny from all </Directory> <Directory /var/svn> Options FollowSymLinks AllowOverride None Allow from all </Directory> <Directory /opt/hg> Options FollowSymLinks AllowOverride None Allow from all </Directory> <Location /hg> AuthType Digest AuthName "Engage HG" AuthDigestProvider file AuthUserFile /opt/hg/hgweb.users Require valid-user </Location> WSGISocketPrefix /var/run/wsgi WSGIDaemonProcess hg processes=3 threads=15 WSGIProcessGroup hg WSGIScriptAlias /hg "/opt/hg/hgweb.wsgi" <Location /svn> DAV svn SVNPath /var/svn/repos AuthType Basic AuthName "Subversion" AuthUserFile /etc/httpd/conf/users require valid-user </Location> I'm trying to get my head around how it's all laid out and how directories relate to locations/etc For /hg I get asked for a password but to /svn I get a 403 forbidden... the error I get is: [client 10.80.10.169] client denied by server configuration: /var/www/html/svn When I remove the entry it works fine.. I can't figure out how to get it linking to the /var/svn directory

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• How does rsync --daemon know which way it is being run?

  - by Skaperen

  I am wanting to run rsync over an SSL/TLS encrypted connection. It does not do this directly so I am exploring options. The stunnel program looks promising, although more complicated than designed due to the need to hop connections with the -r option. However, I do find there is a -l option to run a program. I am assuming this works by having two processes, one to carry out the SSL/TLS work, and one to be the worker which the client is communicating to. These would then communicate by a pipe pair or two way socket between them. What struck me as odd when I surveyed a number of web pages to see how to properly set this up is that whether running as a standalone daemon, or under a super daemon like inetd, the arguments for rsync are the same. How does rsync --daemon know whether it should open a socket and listen on it for many connections, or just service one connection by communicating with the stdin/stdout descriptors is has when it starts up (which really would go through the extra process to handle the encryption, description, and SSL/TLS protocol layer)? And then I need to find a way to wrap the client to have it do SSL/TLS in one simple command (as opposed to connection hopping that stunnel seems to favor).

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• Mac dev folder missing, SSH not working

  - by SamGoody

  A few days ago, SSH stopped working. When I try logging in a get the following message: PTY allocation request failed on channel 0 stdin: is not a tty fatal: unrecognized command '' Connection to 74.52.61.194 closed. Web searches have shown me that there might be something wrong with /dev/std. But my computer lacks a /dev/ drive. There is an Alias to /dev/ [hidden, but I've revealed hidden files to do this search], but when I try to open it I am told that it cannot find the folder it is aliasing. Now, many a web search tells me that without a dev folder, the computer doesn't work, but it does seem to work, except the SSH. Also, are there any tools that can save my SSH preferences so that I don't have to, each time, type out the username@adrees, password, path all of which are long and complex? Not looking for a Filezilla type client, there are many of those. Looking for a command line like putty, that lets me use bash on the remote client. Am on Macbook Pro, latest version of Tiger.

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