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• slicehost google apps mx settings

  - by Bob

  Hello All, I am banging my head against the wall on this one. I followed the MX setup tutorials for Google Mail and it didn't work. Currently, after deleting those records and adding the ones google suggested I have domain.com. 86400 IN MX 10 ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 20 ALT2.ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 20 ALT1.ASPMX.L.GOOGLE.com. domain.com. 86400 IN MX 30 ASPMX2.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX5.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX3.GOOGLEMAIL.com. domain.com. 86400 IN MX 30 ASPMX4.GOOGLEMAIL.com. according to the output of my dig command for my particular "domain". I can send email from google apps mail but I can not recieve any email. It gives me the following error: Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected [email protected] Now I already tried following the slicehost MX article instructions straight as well and they did not work out for me. The domain has already been verified by google and it says the email is activated from their end. Any help would be appreciated : )

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• FreeRADIUS Default Answer

  - by jinanwow

  We are using FreeRADIUS with a MySQL database, authenticating users. We ran into an issue where are MySQL database was slow causing the max number of threads to be reached. The issue with this is, when the server couldn't answer the requests as there were no threads avaiable, it sent the response of Access-Reject to the clients. Our devices cache client connections and periodically checks with the server to see if they should still be allowed or to remove them. The equipment is designed that if there is no response from the server and a client is connected it will remain connected. The issue is, when the radius server is at its max threads, its default answer is to send access-reject (verified via packet capture), however we would like to change the default behavior to just ignore the request (keeping the clients connected). We have fixed the MySQL database issue for now, but I would like to change the default from Access-Reject, to just ignore the client altogeather. I have done research, but not able to find an answer to the question. Thanks in Advance.

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• I think installing PostFix solved my problem, but it seemed *too* easy

  - by Joel Marcey

  Hi, This is a followup to a serverfault post I made a while ago: http://serverfault.com/questions/21633/how-do-i-target-a-different-mail-server-depending-on-domain-with-exim (More context here too: http://forum.slicehost.com/comments.php?DiscussionID=3806 ) I have a slice/VPS at Slicehost. I basically decided to scrap exim (i.e., purge it), and start anew with my email infrastructure. In case you didn't read any of the above threads, basically my goal was to have a send only mail infrastructure that relays all outgoing email to Google Apps. I also wanted to where email from domain1 (a Wordpress installation) would show it coming from domain1.com and email from domain2 (a normal website) would show it coming from domain2.com. So I decided to give PostFix a try. I literally followed the surprisingly simple instructions here: http://sudhanshuraheja.com/2009/02/slicehost-setup-outgoing-mail-google-apps-postfix/ And voila, all seems to be working as I expected. My email tests show email coming from the proper locations (either domain1 or domain2 depending on where the emails were sent from). But this all seemed too simple to me. So simple, in fact, that I feel that something is amiss. When I installed PostFix according to the instructions in the post above and it worked, I was surprised that I didn't have to specify an SMTP server, a port number, any authentication credentials, etc. My slice is set up such that I have MX records for Google Apps (e.g., ASPMX.L.GOOGLE.COM.) in my DNS settings, but I am not sure if that is why it is working. My email infrastructure knowledge is admittedly limited, but with this am I suspect to: Spammers using my email infrastructure? My emails going to people as spam? Something else sinister? I have actually stopped running PostFix until I understand this better. Thanks!

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• Playing iPad to iPad Wifi games over PPTP VPN

  - by Pez Cuckow

  I'm trying to use a VPN to play iPad to iPad Wifi (Local) games over the internet. Normally you open the game on both iPad's, connect to the same Wifi point and they can "see" and speak to each other. I figure using a VPN I can put them both on the same network (either both on the VPN or one on the "real" network and one on the VPN). On my router I've set up PPTP VPN with the ip range 192.168.1.2-50, where the PC's on the real local network are assigned 192.168.1.100+ When I connect one of the iPads to the VPN, using an external WiFi network (BT Openzone) I can ping it as expected (from any machine on the local network). However the iPad's cannot "see" each other and none of the Wifi-Wifi games work. I've also tried connecting both iPad's to the same VPN, with the result the same. All machines on the local network (and those on the VPN) can ping the iPad's but none of the Wifi to Wifi games work. I've set both iPads to send all trafic over the VPN and if I check their external IP's they match that of the real network. Does anyone know how to fix this? And/or what is causing it? Or what further debug information I can provide? Note: I don't feel this is iPad specific so would prefer if this isn't moved to a Apple SuperUser equivalent

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• How can I configure Cyrus IMAP to submit a default realm to SASL?

  - by piwi

  I have configured Postfix to work with SASL using plain text, where the former automatically submits a default realm to the latter when requesting authentication. Assuming the domain name is example.com and the user is foo, here is how I configured it on my Debian system so far. In the postfix configuration file /etc/main.cf: smtpd_sasl_auth_enable = yes smtpd_sasl_local_domain = $mydomain The SMTP configuration file /etc/postfix/smtpd.conf contains: pwcheck_method: saslauthd mech_list: PLAIN The SASL daemon is configured with the sasldb mechanism in /etc/default/saslauthd: MECHANIMS="sasldb" The SASL database file contains a single user, shown by sasldblistusers2: [email protected]: userPassword The authentication works well without having to provide a realm, as postifx does that for me. However, I cannot find out how to tell the Cyrus IMAP daemon to do the same. I created a user cyrus in my SASL database, which uses the realm of the host domain name, not example.com, for administrative purpose. I used this account to create a mailbox through cyradm for the user foo: cm user.foo IMAP is configured in /etc/imapd.conf this way: allowplaintext: yes sasl_minimum_layer: 0 sasl_pwcheck_method: saslauthd sasl_mech_list: PLAIN servername: mail.example.com If I enable cross-realm authentication (loginrealms: example.com), trying to authenticate using imtest works with these options: imtest -m login -a [email protected] localhost However, I would like to be able to authenticate without having to specify the realm, like this: imtest -m login -a foo localhost I thought that using virtdomains (setting it either to userid or on) and defaultdomain: example.com would do just that, but I cannot get to make it work. I always end up with this error: cyrus/imap[11012]: badlogin: localhost [127.0.0.1] plaintext foo SASL(-13): authentication failure: checkpass failed What I understand is that cyrus-imapd never tries to submit the realm when trying to authenticate the user foo. My question: how can I tell cyrus-imapd to send the domain name as the realm automatically? Thanks for your insights!

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• Outlook won't re-connect to exchange after network is re-connected

  - by stan503

  I have a setup at my desk where I connect my computer to a an RJ45 switch that switches between two networks. One network is the corporate network, which is maintained by my company's IT, and the other is my own private network where I do testing (the two networks have to be separated). The corporate network hosts the exchange server where I get e-mail. When I switch from the private network to the corporate network, I expect Outlook to re-connect to the exchange server. However, I have found that sometimes when I come back, Outlook take an extremely long time to re-connect. Send/Receive will give me back the error 'The server is not available' (0x8004011D). It will sit there for 10 minutes to a few hours before it finally re-connects. The only other option is to reboot my computer, which is a huge pain for me since I run multiple VMs on it. This usually happens when I'm connected to the private network for a significant amount of time, so I'm thinking it's because Outlook has cached the network status. Is there a way to force Outlook to do a 'hard' re-connect to the exchange server? I'm using Windows XP SP 3 with Outlook 2007.

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• Proxy settings in Java mail API

  - by coder

  I've written a piece of java code where user1 sends email to user2. I'm behind a proxy and hence I'm getting a javax.mail.MessagingException. How do I solve this problem? Here is the code- import java.util.Properties; import javax.mail.Message; import javax.mail.MessagingException; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; public class Mail { public static void main(String[] args) { final String username = "[email protected]"; final String password = "abc"; Properties props = new Properties(); props = System.getProperties(); props.put("mail.smtp.auth", "true"); props.put("mail.smtp.starttls.enable", "true"); props.put("mail.smtp.host", "smtp.gmail.com"); props.put("mail.smtp.port", "587"); Session session = Session.getInstance(props, new javax.mail.Authenticator() { protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); try { Message message = new MimeMessage(session); message.setFrom(new InternetAddress("[email protected]")); message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("[email protected]")); message.setSubject("Testing Subject"); message.setText("Dear Mail Crawler," + "\n\n No spam to my email, please!"); Transport.send(message); System.out.println("Done"); } catch (MessagingException e) { throw new RuntimeException(e); } } }

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• Setting Outlook Web Access as default mail client in Firefox

  - by Barton Chittenden

  The company that I work for is nice enough to let me use Linux for work, but they use Outlook. I've been using Outlook Web Access (OWA) as my mail client, which is more or less acceptable. The only problem is that whenever I click on a mailto link or use the "Send Link" menu option in firefox, I'm prompted to use evolution. Since connecting to an exchange server through evolution seems to be sketchy at best, I would like to set OWA as my default mail client. I'm using Firefox 3.6.13 Here's what I've found so far: Default mail client can be found at Edit Menu -> Preferences -> Applications Tab -> mailto When I click on the drop down menu, one of the options is "Application Details" This shows two options by default: Google Yahoo! Mail Each of these shows how to launch that service. For Gmail: https://mail.google.com/mail/?extsrc=mailto&url=%s For Yahoo!: http://compose.mail.yahoo.com/?To=%s I presume that Outlook Web Access has something similar. Based on the googling that I've done so far, I think that this should look something like this: https://<server name>/owa/?cmd=compose... A little experimentation on my part shows that the following will compose a message: https://<email server>/owa/?ae=Item&a=New&t=IPM.Note but I still don't know how to specify recipient, subject or body of the email to be composed... What I want to know is a) does anyone know the URL parameters to compose a mailto in Outlook Web Access, including subject, recipient and body? else b) can someone give me a decent pointer for where to get this information?

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• Linux - real-world hardware RAID controller tuning (scsi and cciss)

  - by ewwhite

  Most of the Linux systems I manage feature hardware RAID controllers (mostly HP Smart Array). They're all running RHEL or CentOS. I'm looking for real-world tunables to help optimize performance for setups that incorporate hardware RAID controllers with SAS disks (Smart Array, Perc, LSI, etc.) and battery-backed or flash-backed cache. Assume RAID 1+0 and multiple spindles (4+ disks). I spend a considerable amount of time tuning Linux network settings for low-latency and financial trading applications. But many of those options are well-documented (changing send/receive buffers, modifying TCP window settings, etc.). What are engineers doing on the storage side? Historically, I've made changes to the I/O scheduling elevator, recently opting for the deadline and noop schedulers to improve performance within my applications. As RHEL versions have progressed, I've also noticed that the compiled-in defaults for SCSI and CCISS block devices have changed as well. This has had an impact on the recommended storage subsystem settings over time. However, it's been awhile since I've seen any clear recommendations. And I know that the OS defaults aren't optimal. For example, it seems that the default read-ahead buffer of 128kb is extremely small for a deployment on server-class hardware. The following articles explore the performance impact of changing read-ahead cache and nr_requests values on the block queues. http://zackreed.me/articles/54-hp-smart-array-p410-controller-tuning http://www.overclock.net/t/515068/tuning-a-hp-smart-array-p400-with-linux-why-tuning-really-matters http://yoshinorimatsunobu.blogspot.com/2009/04/linux-io-scheduler-queue-size-and.html For example, these are suggested changes for an HP Smart Array RAID controller: echo "noop" > /sys/block/cciss\!c0d0/queue/scheduler blockdev --setra 65536 /dev/cciss/c0d0 echo 512 > /sys/block/cciss\!c0d0/queue/nr_requests echo 2048 > /sys/block/cciss\!c0d0/queue/read_ahead_kb What else can be reliably tuned to improve storage performance? I'm specifically looking for sysctl and sysfs options in production scenarios.

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• Setting up WHM nameservers

  - by Miskone

  I am new to server administration and I've just got a dedicated root server from Hetzner. First I set up in Hetzner's robot DNS entries Registered nameservers: ns1.raybear.com 88.198.32.57 ns2.raybear.com 88.198.32.57 Under DNS entires I have buzz-buzz.me pointing to 88.198.32.57 // My server IP address and on my WHM I have DNS zone for buzz-buzz.me ; cPanel first:11.42.1.17 (update_time):1402062640 Cpanel::ZoneFile::VERSION:1.3 hostname:hosting.raybear.com latest:11.42.1.17 ; Zone file for buzz-buzz.me $TTL 14400 buzz-buzz.me. 86400 IN SOA ns1.raybear.com. miskone.gmail.com. ( 2014060605 ;Serial Number 86400 ;refresh 7200 ;retry 3600000 ;expire 86400 ) buzz-buzz.me. 86400 IN NS ns1.raybear.com. buzz-buzz.me. 86400 IN NS ns2.raybear.com. buzz-buzz.me. 14400 IN A 88.198.32.57 localhost 14400 IN A 127.0.0.1 buzz-buzz.me. 14400 IN MX 0 buzz-buzz.me. mail 14400 IN CNAME buzz-buzz.me. www 14400 IN CNAME buzz-buzz.me. ftp 14400 IN CNAME buzz-buzz.me. agent 14400 IN A 88.198.32.57 src 14400 IN A 88.198.32.57 platform 14400 IN A 88.198.32.57 But still I have some problems accesing buzz-buzz.me, agent.buzz-buzz.me and platform.buzz-buzz.me Also I have problem getting mails on Google account, I can send but not receive emails. How to solve this. As I said I am completly new here and I need urgent help.:(

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• Monitoring whether Google Apps email address is reachable

  - by Acorn

  Backstory: I bungled things a bit the other day, and inadvertantly deleted the DNS overrides for my domain including the MX records that point to Google Apps, causing 2 days of lost emails. What I want: I want to be able to monitor the email address/account so that I can be alerted if for any reason something has gone wrong and emails aren't arriving. Thoughts: I was thinking there might be a way to test the email without having to send an actual message. Does this exist? This wouldn't help if the DNS has reset itself to a different mailserver would it? The other idea was sending periodic emails to check the address it working. How would you automate this? You'd need to somehow check that the email address had arrived as well as checking if it had bounced. Are there any scripts that exist that would do something like this? What would be the best method? Maybe a combination of checking that the MX records for the domain are set to what they're supposed to be set to, and sending automatic test emails to check that things are still functioning on the Google Apps end?

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• Can I recover a zpool after it's been exported, given that devices have not been reallocated?

  - by cali-spc

  I had a zpool we'll call 'testpool'. testpool had 3 devices included in it, and a single zfs called 'test'. I needed to move 'test' to a new, smaller pool. I wanted to name the new pool the same name 'testpool'. Basically did the following. zfs send testpool@backup > /tmp/test-dump zpool export -f testpool zpool create -f testpool newdevice zfs receive -F testpool < /tmp/test-dump Unfortunately I found out that the testpool@backup snapshot was the wrong snapshot. Too old. I have yet to reallocate the three devices that were in the OLD testpool. (None of these 3 devices are 'newdevice', they are a separate 3.) Is there any way I can recover data in those devices? I'm thinking since I named the new, smaller pool the same as the old zpool, I'm pretty much SOL. But if not, that would be nice to know. Edit: More info I did a 'zpool import' and got this. bash-3.00# zpool import pool: testpool id: 14781458723915654709 state: ONLINE action: The pool can be imported using its name or numeric identifier. config: testpool ONLINE c5t8d0 ONLINE c5t9d0 ONLINE c5t10d0 ONLINE So I'm guessing I just need the syntax to import this zpool using its numeric identifier, while giving it a new name. S.

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• Postfix qmgr process causes heavy overload on mailservers

  - by Mattias

  We are using Postfix as MTA for our e-mailmarketing software and once in a while we see that the load on one of the mailservers rises above 5. The load is caused by the qmgr-process which is the heart of Postfix and I see that it is consuming a lot of CPU resources. The process seems to be stuck because after 15 minutes it is still doing the samething and still increasing the load. Once I restart the postfix service the load rapidly decreases to below 1 and Postfix continues to send e-mails without any problems. I'm wondering if anyone else has encountered this problem and if people have suggestions on how to prevent it. The problem shows up on all our mailservers but almost never at more than 1 at the time. It seems to be triggered only when we are sending a mailing but the size (10 or 100.000 e-mails doesn't seem to make a difference). It maybe happens once a week or even less often and the time and day is also different every time. We tried to solve the problem by decreasing the amount of messages qmgr is allowed to process but this didn't solve it. We are using Postfix 2.5.5 on Debian Lenny 5.0.8 (postfix is installed through the default Debian repository). No special messages can be found in the logs (syslog, messages, mail.*). Thank you for your time

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• My system administrator set up 2 databases that sync. Master-Master. However, these two databases a

  - by Alex

  DB1 and DB2. I made changes to DB1, and it does not seem to be on DB2. When I do "SHOW SLAVE STATUS\G" on DB2, there seems to be an error: mysql> show slave status\G *************************** 1. row *************************** Slave_IO_State: Waiting for master to send event Master_Host: Master_User: Master_Port: Connect_Retry: 60 Master_Log_File: mysql-bin.0005496 Read_Master_Log_Pos: 5445649315 Relay_Log_File: mysqld-relay-bin.0041705 Relay_Log_Pos: 1624302119 Relay_Master_Log_File: mysql-bin.0004461 Slave_IO_Running: Yes Slave_SQL_Running: No Replicate_Do_DB: Replicate_Ignore_DB: Replicate_Do_Table: Replicate_Ignore_Table: Replicate_Wild_Do_Table: Replicate_Wild_Ignore_Table: Last_Errno: 1062 Last_Error: Error 'Duplicate entry '4779' for key 1' on query. Default database: 'falc'. Query: 'INSERT INTO `log` (`anon_id`, `created_at`, `query`, `episode_url`, `detail_id`, `ip`) VALUES ('fdzn1d45kMavF4qbyePv', '2009-11-19 04:19:13', 'amazon', '', '', '130.126.40.57')' Skip_Counter: 0 Exec_Master_Log_Pos: 162301982 Relay_Log_Space: 136505187184 Until_Condition: None Until_Log_File: Until_Log_Pos: 0 Master_SSL_Allowed: No Master_SSL_CA_File: Master_SSL_CA_Path: Master_SSL_Cert: Master_SSL_Cipher: Master_SSL_Key: Seconds_Behind_Master: NULL 1 row in set (0.00 sec) Then, I did show tables, and it seems like DB2 is lacking a table that I created on DB1...that means that for some reason, DB2 stopped syncing with DB1. How can I simply allow them to be in full synchronization again? All I want is DB2 to be exactly the same as DB1!

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• IP Phone over VPN - one way calls unless default route?

  - by dannymcc

  I have come across a strange problem with our VPN and BCM 50 (Nortel/Avaya) phone system. As you can tell by my other questions I have been doing some work on setting a VPN up from one location to another and it's all working well. With one exception. We have an IP phone that is connected at the remote location, straight to a router which has a VPN tunnel to our main practice. The phone works mostly, but every few calls it turns into a one way call. As in, the caller (from the remote phone) can't hear the receiver- but the receiver can hear the caller. This is fixed by setting the VPN tunnel to be the default route for all traffic. The problem with fixing it that way is that all traffic then goes through the tunnel which slows internet access etc. down considerably. The router is set to send the following over the VPN: 192.168.1.0/24 192.168.2.0/24 192.168.4.0/24 The IP of the remote location is: 192.168.3.0/24 The remote router (where the phone is) is a Draytek 2830n, and the local router (at the main practice) is a Draytek 2820. We are using an IPSec tunnel with AES encryption <- as a result of a previous answer pointing to the incompatibility in the hardware encryption. Any advice would be appreciated!

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• 530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

  - by user1636309

  We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is switched through load balancer. We have an application server, call it APP01 There are clients connected to the APP01. There is a need for anonymous mail relay from both clients and APP01. The Anonymous Users setting of the Exchange is DISABLED, but the specific computers - APP01 and clients by the mask, let's say, 192.168.2.* - are enabled. For internal relay, a "Send Connector" is created, and then the above IP addresses are added for the connector to allow computers, servers, or any other device such as a copy machine to use the exchange server to relay email to recipients. The problem is that the relay works for APP01 and some clients, but not others (we get "Client not Authenticated") - all inside the same network and the same mask. This is basically what we do to test it outside of our application: http://smtp25.blogspot.sk/2009/04/530-571-client-was-not-authenticated.html So, I am looking for ideas: What can be the reason for such a strange behaviour? Where I can see the trace of what's going on at the Exchange side?

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• How does one make sure or even guarantee server time are sync correctly between dozens of servers across multiple datacenter on different location?

  - by forestclown

  Currently our web applications contain a logic to check if the data sent to the web server is expired or not by comparing the timestamp of the data with the date/time of the server. Everything goes will, until some dude from data center accidentally modify one of the web server date/time and causes some disruptions in our web services. My managers are of course not happy with this, and said we shouldn't use timestamp to check expiry in the first place...anyway.... Network Time Protocol is implemented, because of data centers are spread across different continents so we have one NTP server in each data center. The servers within the data center will have cron jobs to check against the time with their NTP server from the same data center. If time is out of sync it will auto update the server date/time. But then with our managers not happy with it, and think it could still easily causes the same problem. e.g. what if someone accidentally modify the NTP date/time? what if all the NTP servers are out of sync with each other? which NTP servers we can really trust? and blah blah.. So my questions are: What are the current practice to sync date/time between servers across multiple data centers or locations? How does one manages time stamp between web apps? e.g. Server A send data (contain timestamp of Server A) to Server B (compare timestamp between Server B and the timestamp from the data to see if it has expired or not. This is to avoid HTTP replay) Should we really not use timestamp check? Thanks & Best Regards

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• AWS VPC public web application connecting to database via VPN

  - by Chris

  What I am trying to do is set up a web application that is public facing but makes calls to a database that is on an internal network. I have been trying to set up an AWS VPC with a public subnet, private subnet, and hardware VPN access but I can't seem to get it to work. Can someone help me understand what the process flow here should be? My understanding is that I need a public subnet to handle the website requests and then a private subnet to connect to the VPN but what I do not understand is how to send requests down the chain and get the response. Basically what I am asking is how can I query the database via VPN from that public website? I've tried during rout forwarding but I can't successfully complete the process. Does anyone have any advice on something I can read on this subject or an FAQ on setting something like this up? Is it even possible? I'm out of my league here, this is not my area of expertise but I'm being asked to solve this problem. Any help would be appreciated. Thanks

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• Recover data from physically damaged harddrive. What are my options?

  - by Michael Kniskern

  I was trying to replace the power supply in my desktop PC and ended up physically damaging the data connection from the hard drive to the motherboard. The plastic shelf for the copper prongs on the hard drive broke into the cable. Here is a picture of my handy work: I went to Best Buy Geek Squad to discuss my options and they said that they will need to send it to the recover center it could cost anywhere between $250 to $1600 USD to recover the data out the hard drive Is this reasonable for data recovery from a physically damaged hard drive? Are there any other options I can explore? I am going to talk to the data doctors to see what my options are. Update I took the HD to Data Doctors, and they told me that the SATA connection was broken to they would need to replaced the data connector and then copy the data to a brand new hard drive. So, with the initial analysis, cost of replacement parts, and data recovery fee it came out to $865.00 USD. The technician specifically stated if this was an older hard drive that would just need to replace the data connector. But because there is specific information related to the individual hard drive in the flash ROM, they need to transfer the data to a brand new hard drive.

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• Postfix: Modify sender address based on recipient

  - by PJ P

  We have a Postfix server that receives mail from our application servers. Senders are in the form [email protected] (where host.fqdn can vary, depending on source server) and recipients can be internal or external users. Messages going to external users should have the sender changed to [email protected]. I have tried using canonical maps, but since that is handled by the cleanup daemon, before any transport decisions are made, it would affect all sender addresses. I have also tried creating a custom smtp transport with generic mappings and configuring transport_maps to use that custom smtp transport for external domains. However, generic mappings affect both sender and recipient addresses. Lastly, I've tried the following: Create a custom smtpd daemon that specifies sender canonical maps and a unique transport table. Send all externally addressed mail to that custom daemon. Ideally, sender canonical maps would transform the sender address and the unique transport table would relay messages to the internet. However, evidently, only one transport table can be used per Postfix instance. I want to avoid creating an entirely new Postfix instance to accommodate this rewriting. Any suggestions? (and thanks in advance)

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• Moving a lotus database causes incoming mail failure

  - by Logman

  Hey all, I moved a couple lotus note databases to another hd (ran out of space) by using a directory link/pointer on the domino server. USed a text file with the .DIR ext with the desired new path etc... well that works fine. I open up a lotus notes client, use the id and then OPEN the database. The directory link works fine, the new location of the db is opened with no problems. We found out that we couldnt FORWARD any mail: We did the following to make it work: Goto menu FILE|MOBILE|EDIT CURRENT LOCATION Goto tab MAIL and enter the correct path for "Mail File:" example: it should read "mail\morespace\flabor" and not "mail\flabor" "morespace" = directory link/pointer we can forward and reply to emails fine after that fix. The problem is that the user has no incoming email. Domino is still trying to send the incoming mail of that user to its old db location "mail\flabor" instead of "mail\morespace\flabor". Delivery error saying user does not exist. Is this a cache problem? We have reset the server ("Q" at the prompt), though we have not completely shut it down though. Thanks Frank

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• How to prevent remote hosts from delivering mail to Postfix with spoofed From header?

  - by Hongli Lai

  I have a host, let's call it foo.com, on which I'm running Postfix on Debian. Postfix is currently configured to do these things: All mail with @foo.com as recipient is handled by this Postfix server. It forwards all such mail to my Gmail account. The firewall thus allows port 25. All mail with another domain as recipient is rejected. SPF records have been set up for the foo.com domain, saying that foo.com is the sole origin of all mail from @foo.com. Applications running on foo.com can connect to localhost:25 to deliver mail, with [email protected] as sender. However I recently noticed that some spammers are able to send spam to me while passing the SPF checks. Upon further inspection, it looks like they connect to my Postfix server and then say HELO bar.com MAIL FROM:<[email protected]> <---- this! RCPT TO:<[email protected]> DATA From: "Buy Viagra" <[email protected]> <--- and this! ... How do I prevent this? I only want applications running on localhost to be able to say MAIL FROM:<[email protected]>. Here's my current config (main.cf): https://gist.github.com/1283647

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• Membership in two domains

  - by imagodei

  Hello! I would your suggestions for an effective solution for a person, who needs to access resources in two Windows domains and wants to use one computer. It's about our CEO, who has accepted a second position in another company. Accessing files and folders isn't big problem. The greatest challenge I see is that he wants to conveniently access Exchange accounts in both companies; he would like to send and receive mail in single Outlook if possible (two profiles?) There is also a challenge with calendars: he would like to have one calendar for all activities from both Exchange accounts. Creating a POP3 account for accessing second Exchange server is a last resort, because obviously there is a problem with scheduling meetings and other calendar related tasks. Forwarding and receiving all mail/tasks on primary Exchange server is inconvenient because simple replying to original sender is disabled; and also when manually changing the recepient, he will receive mail from the wrong address. We were considering Virtualisation, that is setting up an instance of virtual machine inside existing installation and then joining this virtual computer to a second domain. Then installing another MS Outlook. This would of course mean two different Outlook accounts, two different calendars, but would at least enable our CEO to access all information from a single laptop. Does anyone have any other idea? I know setting up two domains on a single computer is a no-go (without much hacking at least), but effective workarounds are appreciate. The thing I am looking here is high usage/efficiency/productivity, but also as elegant solution from the administration point of view. Thank you very much (if you managed to read this through, this is a good sign ^_^ )

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