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• Which steps are required to avoid my server being considered as spam sender?

  - by Cyril N.

  I'm looking to set up a webmail server that will be used by a lots of users that will receive and send emails. They will also have the possibility to forward emails they receive. I'd like to know which steps are recommanded/required to indicate to others Mail services (GMail, Outlook, etc) that my server is not used as a spam sender (disclaimer : IT's NOT ! :p) but a legitimate one. I know I have to define a SPF TXT records for example, but what others steps would you recommend me to do ? For example, is there a formula like having a proportional number of servers based on the amount of email sent (for having a different IP address) ? (something like sending a maximum of 1M emails / per IP / per day ?) Something else I'm missing ? I tried to search online, but I mostly find how to avoid emails sent with scripts (like PHP) being put in the SPAM folder. I'm looking for a server/dns configuration side. Thanks a lot for your help/tips, I appreciate !

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• Cisco configuration for public library internet

  - by AlternateZ

  I'm a C/C++ computer programmer turned IT support guy working for a public library. My day is usually spent helping random grandparents learn how to use email, so my networking knowledge is limited to what I can glean from google. Here's the situation. We have a public library with 20 PCs on a LAN and also public wifi access. Previously we were running all of this on 1 ADSL connection and people complained about low speeds. We hired a networking company to set up a Cisco dual-WAN router for us, and purchased an additional ADSL connection. The intention was to give the LAN PCs a guaranteed amount of bandwidth each, and then let the wifi users split the rest. The results were far worse than what we expected, and all we got from the company was excuses and they've since washed their hands of us. During busy periods, net performance on the LAN PCs are so poor that attaching files to gmail etc often times out and fails - far from the "guaranteed amount of bandwidth each" that we hope for! Sometimes it feels like performance is worse than before when we had 1 ADSL link and an unconfigured router? Anyways, surely this is a problem encountered a million times over across the world? (Sharing internet across many users effectively.) What are standard solutions for something like this? I admit to not even knowing the right jargon to google for (load balancing?) I'd appreciate any links to resources/guides that might help me get a better understanding of the problem/solutions, and perhaps some stories of your own experience in solving similar problems. This will help us evaluate and negotiate with network consultants in the future. If its relevant, our router config contains a section "policy-map" with "bandwidth percent" for each class of user (LAN, wifi), and "fair queue".

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• Can't see more than the first few lines in an SSH connection

  - by hello

  I need some help for SSH buffer size. I have a vista machine at home and i have installed "Free SSHD" on it. I also have Dynamic DNS setup to access some of my home lab equipment which are connected to this vista machine. From my work machine which is an XP machine I connect to my home machine using Putty. Everything up to this point is working fine without any problem. The issue is I can't see more lines than the first few lines of the output. I press the space bar to get more output off the screen and the output scrolls up and it gets lost as the more output gets displayed on the screen. The Putty client i am using on my work machine has been setup with enough buffer size but the output still only displays few lines and as it moves up, the buffer gets empty automatically. I have searched the entire web and haven’t found any proper solution any where. Can someone please help here? Thanks.

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• Juniper SSG20 IP settings for email server

  - by codemonkie

  We have 5 usable external static IP addresses leased by our ISP: .49 to .53, where .49 is assigned to the Juniper SSG20 firewall and NATed for 172.16.10.0/24 .50 is assigned to a windows box for web server and domain controller .51 is assigned to another windows box with exchange server (domain: mycompany1.com) mx record is pointing to 20x.xx.xxx.51 Currently there is a policy set for all SMTP incoming traffic addressed to .51 forward to the NATed address of the exchange server box (private IP: 172.16.10.194). We can send and receive emails for both internal and external, but the gmail is saying mails from mycomany1.com is not sent from the same IP as the mx lookup however is from 20x.xx.xxx.49: Received-SPF: neutral (google.com: 20x.xx.xxx.49 is neither permitted nor denied by best guess record for domain of [email protected]) client-ip=20x.xx.xxx.49; Authentication-Results: mx.google.com; spf=neutral (google.com: 20x.xx.xxx.49 is neither permitted nor denied by best guess record for domain of [email protected]) [email protected] and the mx record in global dns space as well as in the domain controller .50 for mail.mycompany1.com is set to 20x.xx.xxx.51 My attempt to resolve the above issue is to Update the mx record from 20x.xx.xxx.51 to 20x.xx.xxx.49 Create a new VIP for SMTP traffic addressed to 20x.xx.xxx.49 to forward to 172.16.10.194 After my changes incoming email stopped working, I believe it has something to do with the Juniper setting that SMTP addressed to .49 is not forwarded to 172.16.10.194 Also, I have been wondering is it mandatory to assign an external static IP address to the Juniper firewall? Any helps appreciated. TIA

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• Active Directory: Determining DN or OU from log in credentials [closed]

  - by Christopher Broome

  I'm updating a PHP login process to leverage active directory on a Windows server. The logging in process seems pretty straight forward via a "ldap_bind", but I also want to pull some profile information from the AD server (first name, last name, etc...) which seems to require a robust distinguished name (DN). When on the windows server I can grab this via 'dsquery user' on the command prompt, but is there a way to get the same value from just the user's login credentials in PHP? I want to avoid getting a list of hundreds of DNs when on-boarding clients and associating each with one of our users, so any means to programmatically determine this would be preferential. Otherwise, I'll know the domain and host for the request so I can at least set the DC portions of the DN, but the organizational units (OU) seem to be pretty important for querying data. If I can find some of the root level OU values associated with the user I can do a ldap_search and crawl. I browsed through the existing questions and found some similar but nothing that really addressed this, so my apologies if the obvious answer is out there. Thanks for the help.

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• Rails application keeps timing out when attempting to connect to Postgresql DB

  - by Corillian

  I'm hosting a postgresql database on a small windows azure Ubuntu 13.04 VM with a default postgresql.conf. I have a Rails application running on a medium windows azure Ubuntu 13.04 VM. When accessing the postgresql database the rails application is constantly timing out. In its database.yml I have the connection pool size set to 120 and the timeout set to 15 seconds. Despite this my rails logs are full of the following error message: ActiveRecord::ConnectionTimeoutError: could not obtain a database connection within 5 seconds (waited 5.0023203 seconds). The max pool size is currently 120; consider increasing it. My postgresql.conf has a max connection limit of 120, making it any larger prevents the server from being able to successfully restart. I've also made sure that ssl was off in the postgresql.conf per this article but beyond that I have no idea what's going on. My postgresql logs don't contain any info indicating something is going wrong. My website is getting ~1k hits per day so perhaps a small VM instance just isn't powerful enough? I appreciate any assistance! [Edit1] The postgresql database is in a separate cloud service within the same affinity group. For example: db small VM: mydatabase.cloudapp.net (Affinity Group US East) forums medium VM: myforums.cloudapp.net (Affinity Group US East) On the database server I have opened port 5432. The connection to the database server from the forums server is using its hostname. Is it possible that the DNS resolution is what's taking so long?

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• Setting up apache vhost for Icinga

  - by DKNUCKLES

  It's been a while since I've worked with Apache so please be kind - I'm also aware of this question but it hasn't been much help to me. I'd like to set up a simple vHost w/ Apache for my Icinga instance. Icinga is up and running and I can access it from x.x.x.x/icinga, however would like to be able to access it externally as well as internally. I have set up the /etc/hosts file and the following is my barebones vhost statement in httpd.conf <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot /usr/share/icinga ServerName icinga.domain.com ErrorLog logs/icinga.com-error_log CustomLog logs/dummy-host.example.com-access_log common </VirtualHost> I also have the following in my .htaccess file <Directory> Allow From All Satisfy Any </Directory> An entry has been made for the instance in the Windows DNS server on my network, however when I try to access the site by URL I am greeted with Internal Server Error. Reviewing the /var/log/icinga.com-error_log I see the following entry. [Thu Dec 13 16:04:39 2012] [alert] [client 10.0.0.1] /usr/share/icinga/.htaccess: <Directory not allowed here Can someone help me spot the error of my ways?

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• Windows 7 Media Center: sometimes no sound on a TV channel

  - by torbengb

  Problem Sometimes, recorded TV shows have no sound. This is of course very annoying because the recorded show is worthless. Also, when switching channels while watching live TV, sometimes a channel has no sound. This is always solved by switching channel again and then back (most often, once will do the trick). Media Center doesn't do this trick by itself when recording of course, so that's the bigger issue - but the cause is certainly the same. Details The computer is running a newly installed Windows 7 and Windows Media Center. It has 2 different tuner-cards installed. Both are installed with signed and up-to-date Win7 drivers and appear OK in Device Manager. Both tuners get the same antenna signal, from a split cable from the wall. The cable delivers analog cable TV (40+ channels) and digital cable TV (4 channels) at the same time. Both tuners have been configured to receive both analog and digital channels. This only happens with analog channels. How can I fix the no-sound problem? Update: I've now spent some time with the computer to try and pinpoint the problem, but I've had little success so far: I flipped through the channels until one didn't have sound, then I disconnected the antenna cable from one of the tuners. It was the right one because then the video also went away. I flipped lots more channels to see if the other card also would come up mute once but I never had a channel without sound. It might still be possible, I don't know. Then I disconnected the "good" tuner and connected the "bad" tuner and again flipped lots of channels but again I never had a channel without sound. It seems to me that the problem is erratic. It happens on any channel, and I haven't ruled out yet that it only happens on one tuner.

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• virtualized windows 2003 domain with CentOS 5.3 and poor connectivity

  - by Chris Gow

  I have a test lab set up running a virtualized windows 2003 domain on a CentOS 5.3(xen) host and am experiencing connectivity problems with guests running on other hosts that are part of the same domain. Here's the setup: On Computer A I have CentOS 5.3 running as the host and have virtualized windows 2003 servers for a primary domain controller, a backup domain controller and an exchange server. The primary domain controller also acts as a WINS and dns server. The windows domain appears on a separate subnet from my company's corporate network. Connectivity to any of the virtualized guests on Computer A is fine (remote desktop, ping, what have you). I have another host computer (Computer B) that also has a virtualized Windows 2003 server guest that is part of the same domain. However, connectivity to that guest is flaky at best. I continuously get at least 60% packet loss when I try to ping the guest, and due to that flakiness I can not access any of the services that it runs (remote desktop, web). Now here's the interesting part. It seems to affect only machines running on a different computer than the domain controller that are in the same domain. On Computer B there is another Windows 2003 guest that is not part of the test domain and is on my corporate network. There's no connectivity issues with that guest machine. The problem does not seem to be specific to Computer B either. I created a test VM on my local computer within the test domain and it exhibits the same behaviour as the guest in Computer B. A couple of items to note: - Host OS on both Computer A and B are the same CentOS 5.3 64 bit - Guest OS is Windows 2003 64 bit and 32 bit (the guest on Computer B is 32 bit) - Guest OSes are all up to date (as of Monday) - Host OS on Computer A was upgraded from CentOS 5.2 to 5.3 Update: Sorry I did not follow up with the comments from below. Computer A and B have been moved to their own dedicated switch and the problem has gone away. I'm not sure what the underlying problem(s) were though

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• Javascript loading never completes on many sites

  - by Joe

  I recently moved country and have found that on many websites the page never finishes loading. In some cases, no content is ever displayed, but the loading will never time out. Loading Developer Tools in Chrome shows me that it is the Javascript files which never load. For example, this BBC article will never load compatability.js, though will load all the other JS files perfectly. Google Maps often fails to finish loading, meaning it's impossible to make searches. There seems to be no pattern to which files will fail to load (i.e. they don't come from the same CDN). I have tried Chrome, Safari and Firefox on OSX 10.8, and Chrome on my girlfriend's OSX 10.7. I have similar issues on the iPad. In many cases, if I can go to the mobile version of the page that seems to load fine. I have run the browsers in private mode, disabled plugins, updated flash, cleared the cache, flushed the DNS cache - though it would seem that if this is happening on other devices, none of this would work anyway. Is this an ISP issue? And if so, why would it be limited to certain JS files and not all? JS files from the same domain work fine, so I'm not really sure what I should be looking for.

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• 100% uptime for a web application

  - by Chris Lively

  We received an interesting "requirement" from a client today. They want 100% uptime with off-site failover on a web application. From our web application's viewpoint, this isn't an issue. It was designed to be able to scale out across multiple database servers, etc. However, from a networking issue I just can't seem to figure out how to make it work. In a nutshell, the application will live on servers within the client's network. It is accessed by both internal and external people. They want us to maintain an off-site copy of the system that in the event of a serious failure at their premises would immediately pick up and take over. Now we know there is absolutely no way to resolve it for internal people (carrier pigeon?), but they want the external users to not even notice. Quite frankly, I haven't the foggiest idea of how this might be possible. It seems that if they lose Internet connectivity then we would have to do a DNS change to forward traffic to the external machines... Which, of course, takes time. Ideas? UPDATE I had a discussion with the client today and they clarified on the issue. They stuck by the 100% number, saying the application should stay active even in the event of a flood. However, that requirement only kicks in if we host it for them. They said they would handle the uptime requirement if the application lives entirely on their servers. You can guess my response.

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• named responding recursive on norecurse queries

  - by Keks

  I have a server on which named is running. It is intercepted with another named server which it is not aware of. Querying the first named server results in timeouts. The server tries to resolve the query recursively. During that the firewall redirects the DNS Request from the first named server to the second one (the query from the first one is addressed to a e.g. a root server and has its "Recursion desired" bit set to 0). Despite that the second named responds to this request with a entirely or at least 1 level more resolved response than the first named server expects. So it ends up with a timeout even though it got a correct name server or even the full IP for the queried domain. In the first case the first name server tries to follow the authority domain ignoring the coresponding glue record and ends up in a loop it aborts: queried: google.com -> got from named#2: ns1.google.com -> ignore glue record and query: ns1.google.com -> got authority from named#2: google.com In the second case it ignores the answer section with the correct IP and instead tries to follow the name servers from the authority section, which ends up in the same dead end as case 1. So how can it be that the second named responds with recursive results even though the bit was explicitly set to 0 in the request from the first named?

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• Server-side SSH jump hosts

  - by Dan Sosedoff

  Trying to figure out server side SSH jump hosts logic. Current network schema: [Client] <--> [Server A: hostname: a.com] <--> [Server B] [Client] <--> [Server A: hostname: b.com] <--> [Server C] Server A responds to both DNS records. Possible flow: Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically jump user onto Server B with ssh user2@server_b.com. Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically just user onto Server C with ssh user2@server_c.com. In other words, client should be able to connect to the target without performing any local configuration, assuming that we have a stock ssh config. The problem with ssh jumps is that user has to define hosts in local ~/.ssh/config file, which is not acceptable in my case. It needs to be a default sshd behavior. Im aware that you can define a custom command ~/.ssh/authorized_keys on server, but i dont think there is a way to properly detect source hostname where user tries to connect. It is possible at all ?

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• FreeBSD jail IMAP/MTA config recommendations

  - by kobame

  I've got access to my "own" FreeBSD jail. The jail has only basic, unconfigured system, but I have full access to FreeBSD ports, and (jail)root too. Now I need to setup my jail as IMAP/MTA. The question: What packages are EASIEST for config and later administration, (the simplest possible setup, with the minimum needed configuration) when: i haven't any preferences (don't know any yet) my (one) domain is managed by ISP, so don't need DNS need only IMAP for few users (up to 20 mailboxes) need secure transport layer (IMAPS/993) password auth, no LDAP, no kerberos, nor databases, nothing like fancy things... need easy-setup easy-admin MTA, with simplest possible password SMTP auth, (again no LDAP, nor DB), secure transport layer but would be nice have virus-scan and some anti-spam protection So, what ports I should install for MTA and IMAP? MTA (Sendmail, Postfix, Exim)? antivirus (ClamAV) antispam??? IMAP(S), (Dovecot, Courier) when the main criteria are: easy setup, and easy administration. When I googled I found only complicated setups for thousands of users with LDAP, databases and so on - too big-caliber for my small (easy?) needs. Any pointer to an easy howto is very welcomed.

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• Unable to remove invalid(orphaned?) SPNs

  - by Brent

  tldr version: Renamed domain from internal.domain.com to domain.com, have 4 SPNs that am unable to remove from DC. So my domain was internal.domain-name.com and I renamed it to domain-name.com and I thought everything was good. Several days later, I start setting up my RD Gateway and am noticing issues surrounding group policy. I run dcdiag and the SystemLog part fails. Starting test: SystemLog A warning event occurred. EventID: 0x00001796 Time Generated: 08/25/2014 02:48:30 Event String: Microsoft Windows Server has detected that NTLM authentication is presently being used between clients and this server. This event occurs once per boot of the server on the first time a client uses NTLM with this server. An error event occurred. EventID: 0xC0001B70 Time Generated: 08/25/2014 02:49:18 Event String: The SQL Server (MSSQLSERVER) service terminated with the following service-specific error: An error event occurred. EventID: 0xC0001B70 Time Generated: 08/25/2014 02:49:48 Event String: The SQL Server (MSSQLSERVER) service terminated with the following service-specific error: An error event occurred. EventID: 0xC0001B70 Time Generated: 08/25/2014 02:52:47 Event String: The SQL Server (MSSQLSERVER) service terminated with the following service-specific error: This made me check my AD for possible connections to the .internal domain. I found four which I remove by: setspn -D E3514235-4B06-11D1-AB04-00C04FC2DCD2/d79fa59c-74ad-4610-a5e6-b71866c7a157/internal.domain-name.com ServerName setspn -D HOST/ServerName.domain-name.com/internal.domain-name.com ServerName setspn -D GC/ServerName.domain-name.com/internal.domain-name.com ServerName setspn -D ldap/ServerName.domain-name.com/internal.domain-name.com ServerName Also, checking my dns records, there's an internal subdomain that I can delete but it comes back as well. I've tried removing the spns to no avail. Is there something I'm missing?

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• Why just splitting an Ethernet cable does not work?

  - by Sin Jeong-hun

  I thought the Ethernet is logically one-line communication bus (for argument's sake, I am excluding hubs). All machines attached in the bus hears the same signals and the machines themselves try to avoid collisions by randomly backing off. http://computer.howstuffworks.com/ethernet6.htm If so, why splitting one Ethernet line from my home router into two and connecting two computers would not work? Why do I have to add a switch to it? *What the Internet said would not work. [4 port home router] ------[one Ethernet cable]-----[simple splitter]======[two computers] *What the Internet said I should do [4 port home router] ------[one Ethernet cable]-----[switch]======[two computers] Is this because of the signal degradation (reduced electric current)? Thank you for all the answers! The reason why I did not just use the two ports of my home router is... The 4-port gigabit router is in my room and I had put a computer in another room (also my room, though). Since wired network is far more reliable and secure, I had bought a long Ethernet cable and and connected the computer to the router. Now I was thinking about adding another computer to that room. I could buy another long Ethernet cable, but then there will be two cables between the rooms. The one line already is a minor annoyance, so I thought if I could share the one line between the two computers in that room. A switch would work, but it requires power and is a little bit pricey. That is why I wondered why it would not work to simply split the physical Ethernet cable. Apparently I do not completely understand how Ethernet and a switch work. I just have some bit of knowledge I heard in my college class.

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• I have bought a custom domain and am using it with Gmail. All My mail is being sent as spam. What can I do?

  - by Leonnears

  A while ago, I purchased my own custom domains for my websites. Before I moved them to Gmail, I just created the e-mails in my CPanel at Bluehost.com and worked from there. When the setup was like that, I could send and receive e-mail fine, and it wouldn't be marked as spam. Now I have moved these custom domains to send and receive e-mails at Gmail using Google apps. I have done everything. I have marked the domains as "Authorized" and I believe that should be enough for the mail I send with these custom e-mails is not send as spam. If it matters, I have configured my iPhone to use these custom domains with it and I'm sending all the e-mail from it. What can I do? I started doing all this today but apparently the DNS changes have already taken place. Is there something I have to do, or is it a matter of waiting 48 hours for my mail to not be marked as spam by other providers yet? EDIT: If I send mail via Gmail itself, the mail is delivered fine. If I use my iPhone however, it gets marked as spam.

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• Is it better to always copy and delete, rather than move?

  - by nbolton

  Generally speaking, I find myself panicking when I realise that if I cancel a file move, it could cause the target or source to be incomplete. This question applies to Windows and Unix-based platforms. I can never remember exactly how the move command works in either case. For example, if you're moving a directory; does it copy the entire directory, then delete it after, or does it copy then delete each file individually? I always realise after typing something like, mv verybigdir dest that I really should have typed cp -R verybigdir dest && rm verybigdir (where the && operator only moves to the next command if the first was successful) -- or is this pointless? What happens exactly when I press Ctrl+C half way through a move? Likewise, what exactly happens on Windows when I press the cancel button? I can't count the number of times I've moved something (the last time was when using svn) and had two directories, with split contents. I guess the answer is difficult, because not all applications move groups of files in the same way.

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• Nginx Server Block Not Working? - Already running other vhosts just this one not working

  - by daveaspinall

  Im running a Debian 6 LEMP server with multiple virtual hosts and everything has been fine for 5 or so sites. But I've just tried adding another but for some reason it's just not working. By not working I mean in Chrome I get the "Oops! Google Chrome could not connect to subdomain.domain.net" error. I've changed the domain for security to subdomain.example.com and the IP is masked. Hosts file (I have multiple sub domains): xxx.xxx.xx.xxx *.example.com *.example Server Block: server { listen 80; server_name subdomain.example.com; access_log /srv/www/subdomain.example.com/logs/access.log; error_log /srv/www/subdomain.example.com/logs/error.log; root /srv/www/subdomain.example.com/public_html; location / { index index.html index.htm index.php; } location ~ \.php$ { include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } } I've created the system link to the file in the /etc/nginx/sites-enabled/ directory and restarted/reloaded nginx. DNS seems fine: # ping -c 2 subdomain PING subdomain.example.com (xxx.xxx.xx.xxx) 56(84) bytes of data. 64 bytes from www.example.com (xxx.xxx.xx.xxx): icmp_req=1 ttl=64 time=0.035 ms 64 bytes from www.example.com (xxx.xxx.xx.xxx): icmp_req=2 ttl=64 time=0.048 ms Checking the file with cURL works: # curl http://subdomain.example.com HTML - OK Emptied browser cache but still no dice. Anything I'm missing? Like I mentioned, I have a few sites running fine on the server currently so php-fpm etc etc are working. Any help would be much appreciated! Cheers, Dave

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• Looking for a software / something to automate some simple audio processing

  - by Daniel Magliola

  I'm looking for a way to take a 1-hour podcast MP3 file and split it into several several 2-minute MP3s. Along the way, I'd like to also do a few things like Amplify the volume. The problem I'm solving is that I have a crappy MP3 player that won't let me seek forward or backward, nor will it remember where I left it when I turn it off, plus, I listen to these in a seriously high-noise situation. Thus, I need to be able to skip forward in large chunks (2-5 minutes) to the point where I left it. Is there any decent way to do this? Audacity doesn't seem to have command-line capabilities. I'm willing to write some code, for example, to call something over the command line and get how long the MP3 file is, to later know how many pieces i'll have, and then say "create an MP3 with 0:00 to 2:00", "create an MP3 with 2:00 to 4:00", etc. I'm also willing to pay for the right tools if necessary. I also don't care how slow this runs, as long as I can automate it :-) I'm doing this on Windows. Any pointers / ideas? Thanks!

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• Strange network connectivity problem

  - by Marc

  Here is my network connectivity: cable modem | |(WAN) wrt54g (default gateway, 192.168.1.1) -- earth |(LAN) | Simple Switch1 | | | | | SimpleSwitch2- neptune | | | | mars mercury | |- venus | |- laptop | saturn (Windows AD DC) simpleSwitch2 was hanging off the wrt54g. I moved it to SW1 during troubleshooting. Nothing described below was any different. earth is connected via wireless to the wrt54g. I can ping from laptop to mars, neptune & mercury. I can ping from earth to venus, saturn & laptop. However, pinging mars, mercury or neptune from earth gives the following result. Pinging mars.XXX.XXX [192.168.1.105] with 32 bytes of data: Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Reply from 192.168.1.122: Destination host unreachable. Ping statistics for 192.168.1.105: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), .122 is the address of the machine from which I am pinging. earth is a Vista machine. Windows firewall is off. saturn is my DNS & DHCP server. Can anyone give me any ideas what the h*ll is going on? Clearly the topology is a factor And yes, I am a space geek.

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• How to secure a group of Amazon EC2 instances

  - by ks78

  I have several Amazon EC2 instances running Ubuntu 10.04 and I've recently started using Amazon's Route 53 as my DNS. The purpose of doing that was to allow the instances to refer to each other by name rather than private IP (which can change). I've pointed my domain name (via GoDaddy) to Amazon's name servers, allowing me to access my EC2 webservers. However, I noticed I can now access the EC2 instances which I don't want to be public, such as the dedicated MySQL Server. I was thinking Amazon's Security Groups would still be in effect when using Route 53, but that doesn't seem to be the case. Before I started using Route 53, I was thinking of having one instance run a reverse proxy, which would help protect the web servers behind it. Then IP-restrict all the other instances. I know IP restricting can be done using the firewall within each instance, but should I ever need to access them from another IP address, I'd need a way in. Amazon's control panel made it a breeze to open a port when necessary. Does anyone have any suggestions for keeping EC2 instances secure, but also accessible to their administrator? Also, what's the best topology for a group of EC2 instances, consisting of web servers and a dedicated database server, from a security perspective? Does having a reverse proxy server even make sense?

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• Strange issue with 74.125.79.118

  - by Domenic

  I'm facing with a strange issue on a Linux server. After frequent crashes the analysis found that the server is led to collapse by a huge number of connections to the ip 74.125.79.118 departing from php scripts of the hosted web sites. After a depth analysis of the files I'm found that are not present any malware infections. Ip 74.125.79.118 is Google. I realize after a Google search that the connections to this ip are generated by embedded video from youtube on web sites, among other Google features like safe search. But I don't understand how this type of behavior can lead to the collapse the server and the uniqueness of the situation leads me to think that the situation is far from being attributable only to Google and Youtube. Also I've found that blocking connections from eth0 to 74.125.79.118:80 doesn't solve the issue but if I stop DNS traffic from eth0 to internet, connections to 74.125.79.118 stops. I'm really confused about this. Any suggestions? Cheers.

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• Nokia E75 Mail for Exchange

  - by Sebastian

  Hi, I have a SBS2003 runing Exchange Server 2003 SP2. My OWA has a godaddy certificate valid for 3 years to come installed. HTTPS works fine for OWA. The certificate has also been copied into the Nokia E95 I am trying to syncronize my Nokia E75 via Mail for Exchange to my mail account on the Exchange server. These are the steps i use: Menu Email New Start Select Internet Gateway Than i enter the details: [email protected] I select company email Mail for Exchange In the domain menu i enter : mydomain In the username/password menu i enter : myusername/mypassword In the server menu i enter : mail.mydomain.com (where the DNS resolves into the server's IP address) In the secure access i select : Internet / Secure / 443 NOTE : port 443 has been opened on my SBOX and forwarded to the exchange server. On IIS default website properties directory security secure communications edit the "Require Secure Channel SSL" is enabled. However, when i try to sync my phone i get the following error code: * Mail for Exch permissions illegal. Check permission configuration. * The phone log gives the following information : Username or Password Illegal. Correct Username and/or Password in the profile options. I've tried speaking with the Phone service support but they cannot identify the problem. Any help will be much apreciated.

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• How can I ensure that my static ip address is read from /etc/network/interfaces rather than dhcp?

  - by jonderry

  This is a follow up to the following question. I'm trying to set a static IP by changing /etc/network/interfaces to the following: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 192.168.2.133 netmask 255.255.255.0 gateway 192.168.2.1 dns-nameservers 8.8.8.8 and then running /sbin/ifdown eth0; /sbin/ifup eth0. However, the change in IP address doesn't appear to take effect without editing /etc/dhcp/dhclient.conf and commenting out the following before running ifdown; ifup: request subnet-mask, broadcast-address, time-offset, routers, domain-name, domain-name-servers, domain-search, host-name, dhcp6.name-servers, dhcp6.domain-search, netbios-name-servers, netbios-scope, interface-mtu, rfc3442-classless-static-routes, ntp-servers, dhcp6.fqdn, dhcp6.sntp-servers; Strangely, after commenting out this line, running ifdown; ifup works, but when I uncomment it, the behavior does not revert to the previous behavior of ignoring changes to my settings in /etc/network/interfaces (this doesn't seem like a problem, but I really need to be able to repeat this problem so that I can be confident that my solution is robust) Also, I'd rather not have to edit /etc/dhcp/dhclient.conf to change my static IP since it seems I should be able to do this by only editing interfaces. Can anyone explain the issues I'm seeing above and suggest the best way of making changes to static IP addresses take effect that admits reproducibility so that I can be sure that my approach works?

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