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• OpenVPN: Single certificate authority, multiple VPNs

  - by darwish

  The company in which I work has a single site (I'll refer it as "Site A"). There are several private networks within site A. We have a running instance of OpenVPN which allows some employees to connect to one of the private networks in site A. We're planning to extend our facilities to another site (which I'll refer as "Site B") and we wish to connect both sites using OpenVPN. The VPN which will connect sites A to B will be a trunk link, meaning it will have access to all networks. If we use the same certificate authority for both VPN servers, this will allow the employees, which can only to one of the private networks within site A, to connect to the site-to-site link, which will give them access to all networks. Off course this is undesirable. Using 2 different certificate authorities seems like the obvious solution, but it doesn't feel right. I wounder if there's a way to maintain permission control within a single certificate authority.

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• What are possible reasons why a calendar entry in OWA is at a different time than in Outlook?

  - by Ken Pespisa

  We have two Exchange 2003 servers, our primary server and a front-end server that hosts Outlook Web Access (OWA). When I open my boss' calendar via Outlook 2007 (from my Outlook client as well as hers) I see the event scheduled for 10:30 am. When I open her calendar via Outlook Web Access, the same event is scheduled for 4:30 am. I don't understand Exchange well-enough to imagine how this is possible. If you have any ideas why this could be happening, I greatly appreciate it. I'd also very much appreciate any insight you have to how this could be possible. There must be some cached data on the front-end server that causes the calendar entry to appear at a different time, I suppose. Any insight into how Exchange manages that cache and where I could look for an issue would be very helpful. Thank you!

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• How to block this URL pattern in Varnish VCL?

  - by iTech

  My website is getting badly hit by spambots and scrappers, I am using Cloudflare but the problem still remains there. The problem is spambots accessing non-existing urls causing a lot of load to my drupal backend which goes all the way and bootstraps db just to serve a 404 error doc. I cant simply dish out non-drupal 404's for all page not found errors, as I need to have drupal catch them. Since, varnish is in front it can check if the bot is acting nice and asking for valid url - if not it servers them a 404 or 403. These bots are causing errors using this pattern : http://www.megaleecher.net/http:/www.megaleecher.net/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_S/Using_iPhone_As_USB_Mass_Storage Now, pls. suggest a regex varnbisg VCL directive which catches this URL pattern and serves a 404 error from varnish, preventing it from reaching apache/drupal ?

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• Logging the client IP with Nginx/Varnish/Apache

  - by jetboy

  I have Nginx listening on port 443 as an SSL terminator, and proxying unencrypted traffic to Varnish on the same server. Varnish 3 is handling this traffic, and traffic coming in directly on port 80. All traffic is passed, unencrypted, to Apache instances on other servers in the cluster. The Apache instances use mod_rpaf to replace the logged client IP with the contents of the X-Forwarded-For header. My problem is that if the traffic is coming via Nginx, while the 'correct' client IP is getting logged in the VarnishNCSA logs, it looks as if Varnish is (understandably) replacing Nginx's X-Forwarded-For header with 127.0.0.1 downstream, and this is getting logged with Apache. Is there a nice simple way to stop Varnish rewriting X-Forwarded-For if it's already populated?

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• ESXI with non standard hardware HDD issues

  - by Hurricanepkt

  I have 3 very underutilized servers that I am condensing to one of those shuttle PC's with VMWare ESXi The HDD seems to be the bottle neck right now (the light is almost always pure solid) right now I have a single 1TB Seagate 7200.11 connected by SATA. VMWare ESXi cannot detect it when running in AHCI mode, but does when running in IDE mode. I have read that IDE mode can give a 5% performance hit which might give me enough breathing room. However, I am open to setting up an external eSATA or some sort of raid to give me more than just the 5%. I am just weary of sinking some money into a bit of hardware without knowledge of whether it will work. Does anyone know of resources or procedures of how to get this working.

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• How to manage SOAP requests to a pool of VM each listening on a HTTP port with a priority value in these requests?

  - by sputnick

  I have a front SOAP web-server under Linux. It will have to communicate with Windows Servers VM listening each on a HTTP port, for a HTTP POST request. The chosen VM should return a report of the task to the SOAP client. In the SOAP requests, there's a special variable : the priority of the request (kind of SLA), and my question is coming right now : I think of using a ha software (nginx, HAProxy, HeartBeat...) that can manage priority in this point of view. Is it relevant or do you think I need to implement a queue by myself with some specific developments? Ex: I have a SOAP requests with low priority in the pipe : the weight priority for these VM should be decreased if I have high priority SOAP requests at the same time. Any clue will be really appreciated.

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• Is it a good idea to take onsite/offsite backups of server images?

  - by ServerAdminGuy45

  Assuming a non-virtualized environment it a good idea to take actual images of servers (using something like Acronis True Image) and store them on\off site? Backing up data is great but I feel it would be good to have copies of OS images in the event hardware dies or an upgrade gets botched I can always revert back. What would be your recommended way to do this (preferably using a NAS and an online backup service)? I was talking with the Iron Mountain folks and the service they described is more geared toward taking incremental snapshots of data. I'm not sure if there's a way to backup images in an incremental way such that only the changes between them are saved (that way I'm not wasting X GB each time I take an image).

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• mod_proxy Fowarding Based on Request Host Header

  - by zigzagip

  Lets say I have 3 URLs and they all point to the same reverse proxy. I would like to have the requests being forwarded to the web servers behind the proxy based on the host header: webfront1.example.com > reverseproxy.example.com > backend1.example.com webfront2.example.com > reverseproxy.example.com > backend2.example.com webfront3.example.com > reverseproxy.example.com > backend3.example.com Based on what I have read, I can configure reverseproxy.example.com/webfront1 > backend1.example.com, reverseproxy.example.com/webfront2 > backend2.example.com, etc. I am wondering if proxy based on host header is even possible or if I used the wrong approach entirely.

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• Win Server 2008 R2 - Mapped shared folder hanging?

  - by M-Tech

  I have recently built a windows 2008 server R2 machine. This is purely for file server purposes and is very much a basic build. All windows updates installed and part of domain. I have setup a shared folder on the C:Drive and added permissions for domain users as co-owners. The client machines run XP SP3 and are part of the domain also. We have a few servers running the same setups on a few of our sites but this one is particular crashes users machines (explorer.exe hangs for at least a few mins) when attempting to access the shared folder. I have turned off the option on the network card for power save aswell still no change. Any help with this is very much appreciated and i look forward to hearing from you ;)

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• How can I easily confirm in Linux that two separate directories have the exact same contents?

  - by Mike B

  CentOS 5.x Mq question seemed similar to this one but I wasn't sure... I have two servers (completely isolated from each other), each with a directory and sub-directories that should have the same exact contents. For example the directory layout could be something like: SERVER A - /opt/foo/foob/1092380298309128301283/123.txt /opt/foo/foob/5094380298309128301283/456.txt /opt/foo/foob/5092380298309128301283/789.txt /opt/foo/foob/1592380298309128301283/abc.txt SERVER B - /opt/foo/foob/1092380298309128301283/123.txt /opt/foo/foob/5094380298309128301283/456.txt /opt/foo/foob/5092380298309128301283/789.txt /opt/foo/foob/1592380298309128301283/abc.txt Ideally I'd like a way to do a recursive check and have something confirm that everything matches. I also want to avoid using any third-party tools. Any ideas?

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• Can't browse computer via nlb cluster name

  - by peg_leg

  I have a fileserver nlb cluster, currently set to single affinity, made up of 2 2008R2 servers. We switched the primary node today. Now our Windows XP workstations can't browse to the cluster name (i.e. \fileserver) but can browse to the cluster ip address (i.e. \192.168.1.1) and can browse the member server by name (i.e. \filesvr1). I remember having a similar issue when we had to change a registry setting to allow Windows XP boxes to see another file server that was in a failover cluster but had to be referred to by another name (\thisfileserver instead of \fileserver). Convoluted, for sure, but it helped to prevent any code changes from happening. Well all of the programmers have their code on \fileserver and we can't have them switch their links every time \filesvr1 supercedes \filesvr2 or vice versa. I can't remember that registry setting that allowed the file server to ignore that it's being called by the wrong name. HELP!

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• How to move mail accounts when migrating webhosting

  - by pkswatch

  I am migrating my website abc.com from one webhosting company to another in a shared hosting environment. Both have cpanel. And the second hosting account i am preparing to move is my multi-domain hosting account with 3 domains already in it. The problem is, i have many email accounts associated with my website abc.com, which are accessed using webmail. So if i move it to the other host, will i lose all those accounts and their emails? If yes, then how should i synchronise the email accounts so that all the accounts and the contained emails remain intact? I saw some several sync tools like IMAP Sync, etc. But these require two hosts while synchronizing, and as you see, i have just one domain name to be synchronized over 2 servers. PS, i do not have any ssh access on either of them, and i have made complete backup of all files using backup wizard in cpanel.

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• Active Directory Account Always Locked

  - by Joel

  My account in the domain at work comes up locked every morning and it's turning out to be unbearable. The domain admins have no clue as to what could be causing it and therefore I must call evey morning to have my account unlocked. I normally don't log off when leaving for the day, next morning I can unlock my computer and access my workstation but when I try to do anything domain-related I realize my account is locked. This is what I've tried so far: Deleted all network drives Made sure all the servers I remotely access neither have a session with my account or a service running under my account. No service is locally running with my account in my workstation. What else can I try?

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• Use Google Apps/Cloud Services as a Domain Controller Replacement

  - by user124548

  This is a Canonical Question about Cloud Services replacing Active Directory. Is it possible to use Google Apps or another Cloud Service as a replacement for a Windows Domain Controller (replacing my whole AD infrastructure)? Specifically, I want to remove our dependence on a local Windows Server; currently it acts as a Domain Controller with File and Print Services. I'd like to seamlessly replace this server with something based on hosted applications. I do not just want to move the server to a dedicated or collocated server. I have yet to figure out how to piece together printer/etc sharing. If anyone has any insight into this, it would be appreciated. The goal is to eventually move all my servers to the cloud then write up a case study on the whole affair.

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• Possible causes for Domain server being unavailable?

  - by serversurfer

  One of our servers was compromised after a user with administrative privileges accidentally loaded a virus from a USB drive on a desktop connected to the domain. The two most obvious symptoms of this were: The server is no longer responding to login attempts The root directory of the drive containing user data has been filled with randomly named empty folders. (Initially it was around a million folders, I've been slowly deleting them.) I've run several virus scans from different vendors and am fairly confident the virus has been removed but the damage is done. I'm hoping the two symptoms are related and that once the directories are gone the server will start responding again. The drive is very slow to respond. I'm deleting about 20k folders at a time. Anymore than that and windows explorer becomes unresponsive. In the event that I finish cleaning up the HD and things don't return to normal what other things can I check?

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• GVim asks for passphrase on every action when using scp

  - by Ashnur

  I want to use my vim config when editing files, but there are at least 5 different servers right now where I have to edit them. Of course I could use console (where I set up ssh-keys and and have a script so it wont asks for passhphrase), but then I have to maintain the vim config on every machine. so I decided to use gvim and browse/edit the remote machines via scp://, but on every action a popup appears asking for the passphrase. this is a ubuntu 10.10 install, with xfce installed later on. i checked in the xfce settings so gnome services should start, but it still won't remember the passphrase.

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• Problems connecting to a linux file server from windows 7

  - by Rister

  I have an old Windows 2000 machine that I'm trying to replace because it is freezing periodically. It is used primarily for email but it does need to be connected to the two linux file servers ("dino1" and "dino2") that are in the office. When I tried to get the new Windows 7 machine to connect I can't find the user account that was being used (or I can't log on to the share). On the old machine the users all logged in as Administrator on the local machine and entered the password ("fuzzypickels") to log onto the share. To me, it seems like the username ought to be Administrator, but when I enter that with "fuzzypickels" it gives me an error that I've got either the username or the password or both incorrect. Is there something missing in my assumptions? Or is there something I can do to recover the username from the old machine?

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• cisco vpn and on demand routing

  - by Chris Lively

  We need to connect to a partner via a Cisco VPN from one of our internal servers. This server is already configured for demand dial routing to a different partner, using windows RRAS. The partner provided us the group authentication credentials and the regular logon credentials. Basically, I need to configure it so that when this server needs to access a specific host it will automatically establish the vpn connection and route that specific traffic to them. How can I do this? I've installed the Cisco VPN Client (5.0.07.0440) on the server and I can open it up and connect. However, I'm stuck on how to configure this to automatically happen.

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• Vim: How can I :cd to an sftp directory?

  - by ChrisInCambo

  Hi, I'm currently an emacs user, but thought I would come back and take another look at Vim for fun. My client machine is Ubuntu, and I frequently work on other ubuntu servers within my network, emacs and tramp is really nice in this regard, I can just connect to a file via sftp and then easily navigate to it's parents/children/sibling, just as if I was dealing with a file on the local file system. With Vim I can sftp to a file, but none of the navigation stuff works, when I use :e or fuzzy file search, vim still thinks I'm back on the client machine. If I try to :cd to the sftp directory I get an error. Is there anyway I can get the same file/folder navigation regardless of whether I'm looking at an sftp folder or a folder on my client machine? Cheers, Chrsi

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• Load-balanced Linux server across internet?

  - by LinuxGnut

  I'm investigating setting up a load balanced server solution consisting of three CentOS 5.4 boxes. Two of these boxes will reside in one facility, while a third will reside in a different facility. I'm currently working to set up heartbeat, ldirectord, ipvsadm to load-balance the machines, but I'm not sure its going to work with I'm not overly familiar with the details behind how all of these work, but is the load balancing going to work correctly when these servers are not all on the same LAN? I'm not sure if heartbeat is using SNMP to send signals or not, which would only work over a LAN. Has anyone tried this or found a different solution?

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• Is A Managed Switch With VLAN Support Required

  - by Justin

  Hello, I am wondering if I need to buy a switch which is managed (VLAN support) for my configuration, or will a cheaper unmanaged switch work? I have servers with two NICS each. The first NIC is public and the second NIC is private. The router will plug into the switch port 1 let's say (public). Then server 1 public plugs into port 2 on the switch, and sever 1 private plugs into port 3 on the switch. The public interface is: 192.168.X.X / 255.255.0.0 and the private interface is 10.0.X.X / 255.255.0.0. So looks like: ** SWITCH ** Port Device Network 1 Router/Firewall 192.168.X.X 2 Server 1 Public 192.168.X.X 3 Server 1 Private 10.0.X.X 4 Server 2 Public 192.168.X.X 5 Server 2 Private 10.0.X.X 6 Server 3 Public 192.168.X.X 7 Server 3 Private 10.0.X.X Thanks.

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• Mimicking Google's Persistent Disks -- Is this a logical FreeBSD disaster recovery strategy?

  - by Casey Jordan

  I am looking into FreeBSD to provide a more comprehensive backup and disaster recovery strategy for database servers. Ideally I want to mimic what google is doing with "Persistent disks" https://developers.google.com/compute/docs/disks#snapshots I am hoping someone who knows more about FreeBSD can validate these ideas/questions: I have read that FreeBSD can take instant disk snapshots, therefore if our databases trigger a consistent state (Block all writes, and flush buffers to disk), I would assume I could take snapshots every hour without service interruption for more than a few seconds. Is this true? Is there a way to take snapshots and back them up offsite easily? Can this be done incrementally as to save how much disk space is actually used? If a rollback needed to be done, how long does this typically take? Is a rollback also instantaneous? Thanks!

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• When should .local be used?

  - by hydroparadise

  So, I've set up a few Win Servs in my time and always did the .local thing when there was a router that sepearated my internal from external networks. Now that I'm setting up an *nix box for the first time, does this concept still apply? Do I still want my FQDNs (/etc/hostname) to show .local or .com for all my machines (mixed: linux servers, win workstations) inside of my network. This question comes in context of always having Active Directory hold my hand every step of the way, where now I'm setting up an DNS machine manually.

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• What would cause SQL 2008 Log Reader Agent to fail with "This process could not execute 'sp_replcmds' "?

  - by Rick

  I've seen this error message in other posts. They didn't seem to help resolving our issue. We are trying this with two SQL Server 2008 servers. I backed up my database from the source server and then restored it on our destination server. We setup basic Transaction Replication. The Snapshot Agent is working fine. The Log Reader Agent fails with the error above. Is it most likely a login issue for this job or QueryTimeout?

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• Windows IPSec computer authentication using *user* account?

  - by Tim Brigham

  For some reason every once in a while it happens that my IPSec authentication is from a user account to a computer account, not computer to computer. How can I fix it? Sometimes - notably when I try to add a new workstation through ePO but it's happened other times as well I'm getting strange behavior from my Windows Advanced Firewall IPSec. This causes the authentication to be invalid (as the group memberships, etc all assume computer accounts). I have no idea why this is happening or how to fix it but the IDs to match up between servers (the opposite server in my second example has remote ID timb).

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