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• Yum through http proxy

  - by eodchop

  I have several Fedora 13 servers that have to connect through an http proxy for yum updates. All port 80 traffic has to be routed through this proxy. I have setup the proxy server in the network settings GUI. I can browse the internet just fine. I have also setup my proxy information in /etc/yum.conf as follows: proxy=http:proxy.largecorp.corp/accelerated_pac_base.pac proxy_user=user proxy_password=password I then added the export HTTP_PROXY="http:proxy.largecorp.corp/accelerated_pac_base.pac" to /etc/bashrc and sourced the file. When i run yum update: Loaded plugins:presto, refresh-packagekit Error: Cannot retrieve repository metadata (repomd.xml) fro repository: fedora. Please verify its path and try again. All of the repo urls are the defaults, as this is a fresh install.

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• Dependency diagramming / mapping tool [closed]

  - by Lars

  I am looking for a tool that allows me to easily create and maintain dependency maps of our mission critical servers, apps, processes, etc. It needs to be intuitive and easy to work with and be able to generate diagrams that clearly show the dependencies graphically. What would be some good tools for this? I have looked at videos for AssetGen Sysmap and BluePrint from Pathwaysystems.com, and they both seem to fit my needs, but there has got to be more good systems like them that I can look at. I want to make sure I pick the best system for our needs (and limited budget).

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• Firewall blocks FTP PASV response

  - by harper

  I have an FTP server that supports passive server mode (using PASV command). This works fine with Windows XP. When I want to access this server from Windows Vista or Windows 7 with firewall enabled I experience an immediate connection shutdown. A reset packet is sent to the server, and the socket is signaled that the server has reset the connection (which is not true). The problem disappears when the firewall is disabled. Connections to other FTP servers work correctly. The difference is that the server's response to PASV does not enclose the address field with parentheses. This is legal as documented in RFC-959 and RFC-1132. How can I configure the firewall to stop this bad behavior?

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• An international mobile app - Should I set up EC2 instances in multiple regions?

  - by ashiina

  I am currently trying to launch an mobile app for users around the world. It is not a spectacular launch which will get millions of users in weeks - just another individual developer releasing an app. I know enough about the techniques of managing timezones, internationalizing string, and what not ( the application layer ). But I cannot find any information on how I should manage my EC2 instances... Should I be setting up EC2 instances in different regions around the world? Is that a must-do, or is it an overkill? I'm aware that it's the ideal solution in terms of performance, but it becomes very tough managing servers in multiple regions. DB issues, AMI management, etc... I'd much rather NOT do so. So I would like to know the general best practice when launching an international app/website. Note: For static contents, I know it's better to use a CDN, so I'm planning on doing so.

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• Setting up Mail (Ubuntu Server 10.04)

  - by Sam

  It seems that mail on my server is functional -- kind of. I have a simple PHP mailer script that is capable of mailing any email address that is not local. e.g [email protected] However, if I try [email protected], it tells me /home/myuser/dead.letter... Saved message in /home/myuser/dead.letter and sometimes You have new mail. What does this mean? Does anyone know what I can do to make my emails actually go through? I'm using google apps for domains -- so basically gmail is hosting my domain's email and I'm not using my own servers for receiving mail. I've set up the nameservers correctly -- I wonder if it's got to do with my sending configuration (what does PHP's mail function normally send with anyway, sendmail?) or maybe it's my receiving configuration -- maybe something makes it act differently for "local" mail

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• Character coding problem

  - by out_sider

  I have a file named index.php which using a mysql server gets a simple username. The mysql server is running on centOS and I have two different systems running apache serving as web servers. One is my own windows pc using a "wamp" solution which uses the mysql server refereed before and the other is the centOS server itself. I use this so I can develop in my laptop and run the final on the centOS box. The problem is this: Accessing centOS box I get (on hxxp://centos): out_sider 1lu?s 2oi Using wamp on windows I get (on hxxp://localhost): out_sider 1luís 2oi The mysql database is configured correctly seeing that both use the same and I used svn repository to move files from windows to centOS so the file is the same. Does anyone have any suggestions? Thanks in advnce

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• Apache httpd + FreeTDS hangs until restarted

  - by Jordan Reiter

  Every so often requests to a Linux server (say, linux.example.org) where the web app (Django) pulls in data from a SQL Server database via FreeTDS will hang. Requests on other servers pointing to the database still work, as do requests on linux.example.org that use local MySQL databases. Only the server plus FreeTDS appear to be affected. Restarting httpd makes the database connections work correctly again. What could cause this problem? Using: Centos 5.9 freetds 0.91 Apache httpd 2.2.3 /etc/obdc.ini: [DSN] Description = SQL Server 2005 Driver = FreeTDS ;Database = dbname Servername = SERVERNAME ;TDS_Version = 8.0 /etc/freetds.conf: [SERVERNAME] driver = /usr/lib64/libtdsodbc.so host = db.example.org port = 1433 tds version = 8.0 client charset = UTF-8

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• Exchange 2010 allows outside access to network files

  - by user2891127

  One of our users discovered by accident he could access our network files from his smartphone while at home. No VPN needed. He was sent an email with an internal link to a network share on his android. When he opened the email and clicked on the link, he could browse our files while at home. Looking at the access logs, the connection to the share and files he accessed came from our mail server (Exchange 2010). We have no sharepoint servers running at all, and certainly not on the Exchange server. What is this function/feature called, and is it possible to turn this function/feature off? Should I turn this off?

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• Is it possible to change User's Home Directorys permission in OSX?

  - by Sosiska

  Most of your staff uses OSX as main operation system. The problem is that recently we were attacked with some odd malware: users are getting zip-file via mail, and when they open this zip file, they execute a binary keylogger malware, that is inside this zipped file. (One click is enough). We have some non-technical limitations and due this limitation we can't configure user's mail servers. But actually we have physical access to their laptops. As far as I know, there is possible to mount user's home directory without "x" (execution) permission in Linux and *BSD. So users can't run some binary file inside home directory. Is it possible to configure OS X so that user can't execute files inside /Users/?

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• Can NFS be forced to refresh stale files/directories when not using noac on the mount?

  - by johnnycrash

  We mount without using noac. I have a file that I append to once every 20 minutes. Then it will be read with mmap about 5,000 times a minute. We only mmap a couple blocks for each read. Needless to say, noac just kills the access performance, so we don't use it. I add data to the end of the file using a mount with noac and read from a mount without noac. The mounts that are reading are not seeing the new data. I want to know if there is a function I can call from c to refresh the attributes of a path and all its files. EDIT: I should add we cannot mount and unmount since there are 16 servers running on each system and they are constantly accessing the files. Well...maybe we could mount and unmount if each server used their own mount. I'd like to avoid that if possible. thanks!

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• PHP and load balancing

  - by StCee

  I have one major domain but the server spec behind it is not good enough. Hence I want to relay the traffic, in particular php-mysql queries to multiple smaller servers. How is that normally be done? (BTW I wonder how much traffic or number of php/mysql request a normal setup on ec2 micro instance can handle? ) I did have a look of EC2 load balancer. But is it only possible to load balance on machines of your own account?

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• Sending a mail to gmail from my local mail server

  - by tambia

  I just configured a mail server and tried sending a mail to my gmail account with a local email I created with my mail servers dns. I didn't go well. I use redhat server and sendmail and the testing was done with evolution mail. I had the following error : "RCPT TO<[email protected]> failed: <[email protected]>... relaying temporarily denied. Cannot resolve PTR for my ip" How can I solve this?

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• Time Capsule + Ubee Router?

  - by Charlie

  I can't for the life of me figure this out. I recently had TWC installed in my house, and wanted to disable the NAT and router functions of it. I have a Time Capsule hooked up to it from LAN1 (on the Ubee) to the WAN port on the TC. The problems started occurring here. I figured the settings would be these: Ubee Configuration mode: Bridge DHCP: Off TC IPv4: 192.168.100.2 Subnet Mask: 255.255.255.0 Router Address: 192.168.100.1 DNS Servers: 8.8.8.8, 8.8.4.4 Router Mode: DHCP and NAT But using those settings, my TC says "Double NAT", so I have to change it all around to the default settings of the Ubee using NAT. This leads me to believe bridge mode doesn't actually turn off NAT...

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• Win 2003 Junction Point to Remote Unix Share

  - by Pogrindis

  Env : Windows Server 2003 with already established shared folders over the local Domain via Windows DC and AD. - Linux box being used as a fileserver with the folder /files/share being R+W by all domain users, this is not a problem. I have already transfered the files from the Windows Box to the /files/share on the Linux Box however i now want to create a junction point in order to prevent users saving to the Windows box. I have tried the FileServer Administration on windows server 2003 however it will not allow me to junction remote servers. I have tried mounting the remote filesystem as a drive and proceeding that way however no joy. Anyone have any suggestions ?

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• Searching Objects on SonicWALL (NSA 2600, SonicOS 6.1)

  - by Justin Scott

  Ok, this may sound like a dumb question, but does the SonicOS web interface not have a search option for object definitions? One of my clients recently decided to replace their Astaro Security Gateways with SonicWALL firewalls. These sit in front of a small data center full of servers and we have several hundred custom service and address definitions that need to be ported. The SonicOS interface provides a basic list for service and address definitions but no search option to be found. To make it worse, there is no option to list them all on one page (they're paginated 50 at a time) so I can't use the text search on the web browser either. The Astaro units have a nice search option on their definitions so perhaps I just got spoiled by their software. Am I missing something or is there some way to search for an object without paging through the list and finding an entry manually?

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• Can a DNS server return NXDOMAIN and an unresolved CNAME even though the alias exists?

  - by Martin

  I'm trying to understand why one given DNS server is not resolving our domain correctly. When I look up www.foo.com from this name server, a CNAME foo.bar.cc is correctly returned but there's no attached A record and the response status is NXDOMAIN. I understand that this could happen if the DNS server can not resolve the alias foo.bar.cc. However, if I use the same DNS server and look up foo.bar.cc directly, I always get the correct A record. When using any other DNS servers I've tested (different ISPs, Google DNS, Open DNS) our domain resolves correctly. Given this situation, is there some possible problem in our DNS that could cause this? Or does it seem like this given DNS server is to blame? The DNS server in question is used by a lot of people and it seems more likely that the problem is caused by us, but I don't see how - any clues?

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• Is there a Utility that will scan selected locations and return all files older than a certain date?

  - by CT

  Can anyone recommend a utility that can scan specified directory locations (network shares specifically) and return all files older than a certain date? I am looking to implement a data retention policy at my workplace. As our amount of data grows it puts a large strain on our backup routines. I would like to move old data to some sort of archival system. Extra points for the ability to move queried old files to another location for archival and the ability to create schedules for when this occurs. Many thanks. EDIT: Windows Shop. Mostly Windows 2003 Servers.

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• Why would my domain admins turn of UAC?

  - by DanO

  I'm a developer of internal software in our company, I've gotten used to UAC in Win7, I prefer to run with in enabled so that our software works correctly with it enabled. Sysadmins have recently pushed out GPO that turns it off every time we log-in. (So I turn it back on every time I log in.) I can imagine some people are annoyed by it and turn it off, but is that really a good company-wide decision? anyone annoyed by it (local admins) would already have permission to turn it of themselves.. right? On the other hand we don't have to worry creating UAC friendly software if no workstations or servers have it enabled. Is there a good reason for doing this? Other than reducing help-desk calls from recent XP users? I can't see the upside of this decision, help me understand.

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• Why do I need to add my application pool identity to the IIS_IUSRS group?

  - by smcolligan

  I'm setting up a .NET v4.0 web application on a Windows 2008 R2/IIS 7.5 server that uses a domain account for the application pool identity. When I access the site, I get the following error: The current identity () does not have write access to 'C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files' According to this: http://learn.iis.net/page.aspx/140/understanding-built-in-user-and-group-accounts-in-iis/ the identity of the worker process is added to the IIS_IUSRS group when the process starts. This seems to work fine for the existing .NET v2.0 applications I have running on the same server (I have not had to add their domain account application pool identities to IIS_IUSRS group). This does not seem to be the case for the first .NET v4.0 web application I'm setting up. Once I add the identity to the group, everything works fine. I suspect something is not configured correctly that is forcing me to do this. I would like to understand this before rolling out more sites/servers. Thanks in advance for your help...

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• Multiple public/private key pairs for the same user

  - by bruceb

  First, sorry if this question has already been asked/answered - I've searched but perhaps I haven't recognised the answer.... What we have is a cluster of servers which need to access a single remote server using sftp. We are migrating from one remote server to another at the same (remote) location. We also want to refresh the public/private key pairs on the configuration as part of an ongoing security review. My question is - can we have multiple public/private key pairs for the same user between server A and server B? I want to do this to allow for cutover testing - but am concerned that the software checking keys may only try one of each type (rsa/dsa?) before rejecting the connection method and moving to the next type of key. Hope it's a straightforward question - please let me know if I need to supply more details. Thanks in advance Bruce

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• Redirect subdomain.example.org to somethingelse.com hidden to the user?

  - by moontear

  I'm not knowledgeable at all about C-NAMES, A-RECORDS, name servers and the like, so just bear with me on this one: I want to redirect subdomain.example.org to another domain somethingelse.com. I do own both domains and both domains run on shared hosting. When creating a subdomain, all I can do out-of-the-box is do a HTTP redirect (302, yuck!) or a frame redirect. I also can set the DNS records on one host like nameserver, CNAME - but I would have know clue what I am doing. Please explain to me how routing with nameservers works and how I should (even if not possible with my current host) redirect subdomain.example.org to somethingelse.com with the user-visible URL staying at "subdomain.example.org"

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• Group policy reset upon restart?

  - by sc_ray

  Is it possible for a group policy to revert back to its original state upon server restart? Our servers are hosted as a Virtual Machine on the rack. We had to restart our server for some reason and all of a sudden we cannot remote desktop into the server any more. Pinging the server succeeds but RDPing into it fails. My assumption is that the group policy has reverted back preventing any remote desktop connections from taking place. Is that a possibility? Since the network is managed by another group, we don't have the authority to physically look into what's going on with this particular VM. Can somebody suggest some ideas? Thanks

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• Public key repository - does this exist?

  - by allegroconmolto

  This is one of those "Surely this already exists, and if not, I damn well better build it!" moments. Here's my problem: I run a devteam, of around 10 individuals. Each of us has our own private key(s). When I go set up a new server for us, I have to import all of their keys to it. And if we start working with a contractor, I have to get his or her key too, and then import it and place it in .ssh/authorized_keys on the server. Ideally I'd like to be able to do something along the lines of: import_key allegroconmolto And it would contact a public repository of public keys, see if there was a user named allegroconmolto, and if so, import their key and add it to my authorized_keys. Adding future users would then be as simple as running import_key for them. I could then scp the authorized_keys file to all my servers and be done! This seems so obvious that I feel like it surely must exist somewhere.

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• How can I tell if a host is bridged and acting as a router

  - by makerofthings7

  I would like to scan my DMZ for hosts that are bridged between subnets and have routing enabled. Since I have everything from VMWare servers, to load balancers on the DMZ I'm unsure if every host is configured correctly. What IP, ICMP, or SNMP (etc) tricks can I use to poll the hosts and determine if the host is acting as a router? I'm assuming this test would presume I know the target IP, but in a large network with many subnets, I'd have to test many different combinations of networks and see if I get success. Here is one example (ping): For each IP in the DMZ, arp for the host MAC Send a ICMP reply message to that host directed at an online host on each subnet I think that there is a more optimal way to get the information, namely from within ICMP/IP itself, but I'm not sure what low level bits to look for. I would also be interested if it's possible to determine the "router" status without knowing the subnets that the host may be connected to. This would be useful to know when improving our security posture.

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• How to keep programs from source up to date?

  - by wizard

  I'm designing a new server setup for hosting multiple websites. (Shared hosting for my clients over at SliceHost.) I've recently moved away from the traditional LAMP setup and chosen Ubuntu, Nginx, php-fpm and mysql. I like it a lot better then my old Apache, suphp, mysql setup. It works great, provided encapsulation between sites and uses substantiallly less memory. However I have one major maintenance problem. In order to have a recent version of Nginx and in order to use php-fpm I've had to compile these programs from source. The reason I see this as a problem is that keeping track of updates, and build configurations will end up being a lot of work. For two programs (and a patch) I can handle it, but it seems like this setup would not scale with many packages and servers. Are there good ways to manage this situation? I'm sure people do this all the time.

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