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• Exchange2010 has Private Machine Name and IP in outbound SMTP - How to remove?

  - by user44755

  We have a domain (domain.local) that has IP Addresses in the 10.10.10.* range. In the outbound SMTP server traffic, I see the internal machine name (exchange.domain.local), and the internal ip address (10.10.10.55). The question is, how do you remove this header from exchange, or change it to have the external machine name/ip addresses. I am not talking about the HELO / EHLO handshake as part of the protocol. Please help.

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• Is there a way to find my SMTP information from my Exchange Server 2007?

  - by patzyyy

  Is there a way to find my SMTP information on my Exchange Server 2007? It was set up by someone else but I have full admin rights. I would like to use it for an internal .net application just to send emails locally. Thanks in advance! Daniel

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• Change permission of raw device by UUID

  - by Omid Kosari

  I am using "Apache Traffic Server" which may and it is better to use raw device like /dev/sdb without mounting it as a directory . So i should change the permission of /dev/sdb from root to user "trafficserver" to allow it formatting whole device as it likes . The problem starts after each reboot because /dev/sdb changes randomize so i should use UUID . But i can not change the permission of /dev/disk/by-uuid/48c2fac6-06eb-42c7-8b8a-3b83b781f28c . Is there a way to permanently change permission of disk drive by UUID ?

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• Setting folder permission so it isn't deletable, but everything else is allowed

  - by user10324

  I want to set permissions to a folder such that, when I'm normally logged in (meaning not as root), this folder isn't deletable, but I can still change the name of this folder and move in around in my system ? IS this possible and if yes, how to set the permission ? I already tried different combinations for the permissions but couldn't figure out how to do it. Also (side question), if some folder hast some permission set and I copy this folder, along with its contents (assuming I am allowed to read it) to a memory, are these permission preserved ? I suppose not, since under Windows I could delete the folder on the stick, even if under Ubuntu it isn't allowed to delete it...

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• ASP.NET: Using pickup directory for outgoing e-mails

  - by DigiMortal

  Sending e-mails out from web applications is very common task. When we are working on or test our systems with real e-mail addresses we don’t want recipients to receive e-mails (specially if we are using some subset of real data9. In this posting I will show you how to make ASP.NET SMTP client to write e-mails to disc instead of sending them out. SMTP settings for web application I have seen many times the code where all SMTP information is kept in app settings just to read them in code and give to SMTP client. It is not necessary because we can define all these settings under system.web => mailsettings node. If you are using web.config to keep SMTP settings then all you have to do in your code is just to create SmtpClient with empty constructor. var smtpClient = new SmtpClient(); Empty constructor means that all settings are read from web.config file. What is pickup directory? If you want drastically raise e-mail throughput of your SMTP server then it is not very wise plan to communicate with it using SMTP protocol. it adds only additional overhead to your network and SMTP server. Okay, clients make connections, send messages out and it is also overhead we can avoid. If clients write their e-mails to some folder that SMTP server can access then SMTP server has e-mail forwarding as only resource-eager task to do. File operations are way faster than communication over SMTP protocol. The directory where clients write their e-mails as files is called pickup directory. By example, Exchange server has support for pickup directories. And as there are applications with a lot of users who want e-mail notifications then .NET SMTP client supports writing e-mails to pickup directory instead of sending them out. How to configure ASP.NET SMTP to use pickup directory? Let’s say, it is more than easy. It is very easy. This is all you need. <system.net>   <mailSettings>     <smtp deliveryMethod="SpecifiedPickupDirectory">       <specifiedPickupDirectory pickupDirectoryLocation="c:\temp\maildrop\"/>     </smtp>   </mailSettings> </system.net> Now make sure you don’t miss come points: Pickup directory must physically exist because it is not created automatically. IIS (or Cassini) must have write permissions to pickup directory. Go through your code and look for hardcoded SMTP settings. Also take a look at all places in your code where you send out e-mails that there are not some custom settings used for SMTP! Also don’t forget that your mails will be written now to pickup directory and they are not sent out to recipients anymore. Advanced scenario: configuring SMTP client in code In some advanced scenarios you may need to support multiple SMTP servers. If configuration is dynamic or it is not kept in web.config you need to initialize your SmtpClient in code. This is all you need to do. var smtpClient = new SmtpClient(); smtpClient.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory; smtpClient.PickupDirectoryLocation = pickupFolder; Easy, isn’t it? i like when advanced scenarios end up with simple and elegant solutions but not with rocket science. Note for IIS SMTP service SMTP service of IIS is also able to use pickup directory. If you have set up IIS with SMTP service you can configure your ASP.NET application to use IIS pickup folder. In this case you have to use the following setting for delivery method. SmtpDeliveryMethod.PickupDirectoryFromIis You can set this setting also in web.config file. <system.net>   <mailSettings>     <smtp deliveryMethod="PickupDirectoryFromIis" />   </mailSettings> </system.net> Conclusion Who was still using different methods to avoid sending e-mails out in development or testing environment can now remove all the bad code from application and live on mail settings of ASP.NET. It is easy to configure and you have less code to support e-mails when you use built-in e-mail features wisely.

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• Problem with Java Mail : No provider for smtp

  - by user359198

  Hello all. I am using JavaMail to do a simple application that sends an email when it finds some files in a directory. I managed to get it worked from Eclipse. I Run the application and it sent the email with no errors. But, when I created the jar, and executed it, it fails in the email sending part. It gives this exception. javax.mail.NoSuchProviderException: No provider for smtp at javax.mail.Session.getProvider(Session.java:460) at javax.mail.Session.getTransport(Session.java:655) at javax.mail.Session.getTransport(Session.java:636) at main.java.util.MailManager.sendMail(MailManager.java:69) at main.java.DownloadsMail.composeAndSendMail(DownloadsMail.java:16) at main.java.DownloadsController.checkDownloads(DownloadsController.java:51) at main.java.MainDownloadsController.run(MainDownloadsController.java:26) at java.lang.Thread.run(Unknown Source) I am using the library in this method: public static boolean sendMail(String subject, String text){ noExceptionsThrown = true; try { loadProperties(); } catch (IOException e1) { System.out.println("Problem encountered while loading properties"); e1.printStackTrace(); noExceptionsThrown = false; } Properties mailProps = new Properties(); String host = "mail.smtp.host"; mailProps.setProperty(host, connectionProps.getProperty(host)); String tls = "mail.smtp.starttls.enable"; mailProps.setProperty(tls, connectionProps.getProperty(tls)); String port = "mail.smtp.port"; mailProps.setProperty(port, connectionProps.getProperty(port)); String user = "mail.smtp.user"; mailProps.setProperty(user, connectionProps.getProperty(user)); String auth = "mail.smtp.auth"; mailProps.setProperty(auth, connectionProps.getProperty(auth)); Session session = Session.getDefaultInstance(mailProps); //session.setDebug(true); MimeMessage message = new MimeMessage(session); try { message.setFrom(new InternetAddress(messageProps.getProperty("from"))); message.addRecipient(Message.RecipientType.TO, new InternetAddress( messageProps.getProperty("to"))); message.setSubject(subject); message.setText(text); Transport t = session.getTransport("smtp"); try { t.connect(connectionProps.getProperty("user"), passwordProps .getProperty("password")); t.sendMessage(message, message.getAllRecipients()); } catch (Exception e) { System.out.println("Error encountered while sending the email"); e.printStackTrace(); noExceptionsThrown = false; } finally { t.close(); } } catch (Exception e) { System.out.println("Error encountered while creating the message"); e.printStackTrace(); noExceptionsThrown = false; } return noExceptionsThrown; } I am loading these values from properties files. mail.smtp.host=smtp.gmail.com mail.smtp.starttls.enable=true mail.smtp.port=587 mail.smtp.auth=true I have tried to change the host by ssl://smtp.gmail.com, the port by 465 (just for trying something different), but it doesn't work either. Anyway, if it works fine from Eclipse with the original parameters, I guess that the values are correct, but the problem is creating the jar. I don't know very much about the possible results or changes when creating a jar. Could the JavaMail libraries someway go wrong when the jar is created? Do you have any ideas? Thank you very much for your help.

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• Postfix: Using google apps for stmp errors

  - by Zed Said

  I am using postfix and need to send the mail using google apps smtp. I am getting errors after I thought I had set everything up correctly: May 11 09:50:57 zedsaid postfix/error[22214]: 00E009693FB: to=<[email protected]>, relay=none, delay=2466, delays=2462/3.4/0/0.06, dsn=4.7.0, status=deferred (delivery temporarily suspended: SASL authentication failed; cannot authenticate to server smtp.gmail.com[74.125.155.109]: no mechanism available) May 11 09:50:57 zedsaid postfix/error[22213]: 0ACB36D1B94: to=<[email protected]>, relay=none, delay=2486, delays=2482/3.4/0/0.06, dsn=4.7.0, status=deferred (delivery temporarily suspended: SASL authentication failed; cannot authenticate to server smtp.gmail.com[74.125.155.109]: no mechanism available) May 11 09:50:57 zedsaid postfix/error[22232]: 067379693D3: to=<[email protected]>, relay=none, delay=2421, delays=2417/3.4/0/0.06, dsn=4.7.0, status=deferred (delivery temporarily suspended: SASL authentication failed; cannot authenticate to server smtp.gmail.com[74.125.155.109]: no mechanism available) main.cf: # Debian specific: Specifying a file name will cause the first # line of that file to be used as the name. The Debian default # is /etc/mailname. #myorigin = /etc/mailname smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU) biff = no # appending .domain is the MUA's job. append_dot_mydomain = no # Uncomment the next line to generate "delayed mail" warnings #delay_warning_time = 4h readme_directory = no # TLS parameters #smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem #smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key smtpd_use_tls=yes smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache # See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for # information on enabling SSL in the smtp client. myhostname = zedsaid.com alias_maps = hash:/etc/aliases alias_database = hash:/etc/aliases myorigin = /etc/mailname mydestination = #relayhost = mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 recipient_delimiter = + inet_interfaces = all delay_warning_time = 4h smtpd_recipient_limit = 16 # how many error before back off. smtpd_soft_error_limit = 3 # how many max errors before blocking it. smtpd_hard_error_limit = 12 ## Gmail Relay relayhost = [smtp.gmail.com]:587 smtp_use_tls = yes smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous smtp_sasl_tls_security_options = noanonymous smtp_sasl_mechanism_filter = login smtp_tls_eccert_file = smtp_tls_eckey_file = smtp_use_tls = yes smtp_enforce_tls = no smtp_tls_CAfile = /etc/postfix/cacert.pem smtpd_tls_received_header = yes tls_random_source = dev:/dev/urandom transport_maps = hash:/etc/postfix/transport debug_peer_list = smtp.gmail.com debug_peer_level = 3 What am I doing wrong?

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• Anonymous user permission issue in SharePoint Server

  - by George2

  Hello everyone, I am using SharePoint Server 2007 x64 and Windows Server 2008 x64. I have setup a site with template publishing portal. I have grant anonymous access to all the site. My question is, if I create a new page, how to grant permission to anonymous user to access (read permission) the page? I got this confusion because, for the permission setting of a page, a permission is set according to a user name (e.g. read permission for user "foo" of a page). Since anonymous user does not have a related "user name", how could I grant read permission to anonymous user? BTW: I use Windows Forms authentication and Windows NTLM authentication for my sites. Thanks in advance, George

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• Postifix SMTP Load Balance

  - by user103373

  I want to load balance outbound emails between 3 post-fix gateways for sending mails only reason is to use multiple different source IPs to increase throughput & inbox delivery. Each gateway should receive an approximately equal amount of outbound messages. How is it possible please suggest. +---------- smtp A --------- Internet | clients -------- smtp lb ----- smtp B --------- Internet | +---------- smtp C --------- Internet

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• PHP GD problem--not enough permission to make image?

  - by aaron

  Error: Warning: imagejpeg() [function.imagejpeg]: Unable to open 'images/xxx/xxx.jpg' for writing: Permission denied in /usr/www/users/xxx/resources/func.createthumbs.php on line 48 images/xxx/xxx/xxx.jpg Warning: Cannot modify header information - headers already sent by (output started at /usr/www/users/xxx/resources/updatethumbs.php:17) in /usr/www/users/xxx/resources/func.createthumbs.php on line 3 So... How can I change the permission? This is being run on a shared server--is it possible?

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• Exchange 2010 periodically stops responding to SMTP events with error 421 4.4.1 Connection timed out

  - by Michael Shimmins

  After some help diagnosing why Exchange 2010 Enterprise stops responding to SMTP events. I can't find a pattern to it. It doesn't appear to be an actual timeout, as the server responds immediately with the error. To reproduce it I telnet into the server on port 25 and issue a EHLO. The server immediately replies with the 421: 421 4.4.1 Connection timed out Once this starts happening I've found restarting the exchange box is the only reliable way to get it flowing again. Sometimes restarting the Transport service or the mailbox attendant service seems to fix it, but this could be coincidental as it often has no effect.

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• Just want to send emails from my Ubuntu Server. What simple SMTP server solution to use?

  - by Sergio Oliveira Jr.

  Basically I have a Ubuntu Server machine and I would like an idiot-proof solution for sending emails from my website that is also running in this same machine. My doubts are: 1) Should I use postfix or there are more simple solutions for an smtp server? 2) Do I need to be able to receive emails as well? I just want to send emails... 3) I did I simple test with postfix that came with my Ubuntu server and the email got sent, but it went to the spam box of my gmail. Anyway to avoid the spam box? 4) The email sender was [email protected]. How do I change that? Thanks very much! -Sergio

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• Exchange 2010 periodically stops responding to SMTP events with error 421 4.4.1 Connection timed out

  - by Michael Shimmins

  After some help diagnosing why Exchange 2010 Enterprise stops responding to SMTP events. I can't find a pattern to it. It doesn't appear to be an actual timeout, as the server responds immediately with the error. To reproduce it I telnet into the server on port 25 and issue a EHLO. The server immediately replies with the 421: 421 4.4.1 Connection timed out Once this starts happening I've found restarting the exchange box is the only reliable way to get it flowing again. Sometimes restarting the Transport service or the mailbox attendant service seems to fix it, but this could be coincidental as it often has no effect.

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• Does SMTP greylisting a) stop much spam and b) stop much legitimate mail?

  - by Whisk

  I've just set up an SMTP server on a relatively little used domain using Postfix and enabled greylisting with SQLGrey. So far it seems to be working OK, and while there's the slight irritation of delays to emails from new senders, I can see from the logs that it's deterring a number of spam messages. In your experience does greylisting effectively stop much spam? Is it a useful addition to e.g. SpamAssassin or is adding it on top overkill/unnecessary? If I were to roll this out to heavier use domains (perhaps with more demanding users) would you anticipate a significant portion of poorly configured mail servers that would end up bouncing or losing messages?

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• Windows 2003 SMTP virtual server, why emails are not delivered?

  - by bardan

  Configured Windows 2003 as my email client, everything works fine with POP3 (i'm able to recieve emails), the problem is with SMTP and i can't figure out how to find where excatly this problem is, because email looks like it is sent, but recipients don't recieve anything... i had some problems with relying, but fixed everything, and now i configured outlook express on the same machine, trying to send emails and it looks everything fine, email goes to SENT folder, no errors, but recipients (tried several diffrent) don't revieve any letters... tried to test from the same machine with telnet like it described there http://support.microsoft.com/kb/153119 ant everything looks ok...

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• SMTP IP - Bad reputation, how do I work around?

  - by Louis van Tonder

  I recently had a spamming incident and got listed on a blacklist. I have rectified the issue, removed from the blacklist, but my IP reputation is now classified as a high volume sender. What is the best way to rectify this? I have an additional IP address. I am thinking configure my server to make outbound SMTP connections using the other IP. My questions are: How long does it take for my reputation to stabilize again? How do I configure my server/mailserver to use a specified outbound IP? Setup: Server 2008 Web hMailserver 2 IPs configured on one NIC Cloud based server Your urgent help would be greatly appreciated. Cheers

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• How secure is using "Normal password" for SMTP with connection type = STARTTLS?

  - by harshath.jr

  I'm using an email client for the first time - for the most part I've always used gmail via the web interface. Now I'm setting up thunderbird to connect to an email server of my own (on my own server, own domain name, etc). The server machine (and the email server on it) was preconfigured for me. Now i figured out away by which I'm able to send and receive email, but I noticed that in the outgoing and incoming servers section, the connection type was STARTTLS (and not SSL/TLS), and the Authentication Type was "Normal Password". Does this mean that the password will be sent across in plain text? I'm very paranoid about security - its the only way that it works for me. Can someone please post links that explain how SMTP (my outbound server) and IMAP (my inbound server) servers work, and what connection type means what? Thanks! PS: If this question does not belong here, please redirect me.

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• It's possible to use google smtp for sending email from my server?

  - by Magnetic_dud

  Well, I am becoming crazy to let my email deliver to gmail/hotmail from my new ip. Last year, i had no problems with my past ip, but now my emails go straight to the spam folder of gmail and hotmail. I checked with mxtoolbox.com and i am not blacklisted, not an open proxy, rdns is configured the right way, SPF policy is present on the DNS. My spf is v=spf1 a mx ~all But, still, I am filtered. So, I am wondering: since gmail does not accept my emails, it's possible to use gmail smtp server to deliver all mails from my server? AFAIK, it will change all the "from" address, but maybe there is a way to not let it happen?

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• Solution to: Hotmail Senders receiving NDR : “550-Please turn on SMTP Authentication in your mail client…”

  - by Tony Yustein

  Original question is here original question I can not answer to that question because the system requires me to have 10 credits, very nice.... This error is based mostly on mobile devices, mostly on iPhones and mostly on mobile networks. This is how much I have narrowed it to. I believe: Hotmail checks where your are connecting from If it is a mobile network it requires additional security for sending messages but the default iPhone config does not have this option for hotmail if the user creates the hotmail account on the iPhone with SMTP AUTH enabled manually it might solve the situation Cheers, Tony

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• Setting Return-Path Header Other than Sender Address using SMTP command.

  - by Matt

  Greetings all. I'm faced with an issue with basic SMTP.. I would like to set the return-path header to an address other than the Sender address (i.e. From: Header) using SMTP command. I know MAIL -F sets it. However, I issued the following sequence of commands into my mail daemon (TELNET rlogin) and got the SMTP error 503 - Bad Command Sequence TELNET HELO: MAIL FROM : MAIL -F: RCPT TO: Subject: Test Bounce test mail for bounce functinlaity quit Can anyone of you please suggest me a possible way out of this? I will be grateful. Cheers, Matt.

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• Exchange 2003 - how to route ALL mail (including internal) via an external SMTP gateway? (Or, domain

  - by Scandalon

  Short version: Is there a way to have Exchange route all email, including internal AD users that would normally be routed directly, through an external gateway? (SMTP, probably a "Smart Host" in exchange nomenclature.) Longer version: I'm not an email expert/admin/orevencompetent. Inherited an exchange 2003 server, migrating to web-based SaaS provider. To add to the fun, we're also (forced by deadlines) transitioning domains. What we (my boss) wants is any email sent to the new domain to have a copy sent to both domains. Getting mail sent to the new domain/provider to then be copied/forwarded to our old domain/exchange is easy. But we want mail sent from the old domain to the old domain to get sent to the new domain as well. However: If we route all outgoing exchange mail through the new provider gateway, w/ the new domain forwarding to the old, we'd get an email loop. The "solution" desired is for an exchange user that sends to another exchange user to still be sent via the external gateway, which would in turn be sent to the new domain, and copied/forwarded back to the old domain. Is it possible? A bit of a strange request I'm sure. And I expect that what we're attempting to do is DoingItWrong(tm). Any better ideas?

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• postfix smtp relay script

  - by Peter Sander

  I have a Postfix server and using it with Outlook (POP/SMTP). I have different sender addresses for an account. Now I want to configure a relay for a specific sender address. For example I have postfix for my main domain domain1.com. Now I have a sender address that is domain2.com. For that sender address I want that postfix to relay mail to a second SMTP server. I think that should be possible without problems. But the problem is that I have to create a SSH tunnel to the second server to connect to the SMTP server. But I cant use a persistent SSH connection so I want to know if it is possible that postfix executes some script before relaying the mail to the second SMTP server. I already found some information for executing a script when incomming emails but I only want to establish the SSH tunnel before postfix relays the mail to the second SMTP server.

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• access denied when trying to open terminal on desktop

  - by chris

  ok so heres the skinny. I just moved some file using the sudo su command so i can move them to bin folder in file system then after closing terminal tried to reopen from desktop and got permission denied. I then rebooted and now i cant access my account and when trying to login it starts to boot then back to login screen. I then boot up in xterm and i get this message bash: /home/chris/.bashrc:Permission denied. I'm currently running xubuntu 10.04 and would like to get back in to that user. Can someone please help me. Not a noob but close to it. Thanks to anyone who helps and the quicker the better.

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• Apache2 Permission denied: access to / denied

  - by futureled

  Hi, after installing and starting apache2 i can't open the website and got the error "Forbidden You don't have permission to access / on this server." I tried some different options in the httpd.conf, but nothing helped me solving this problem. All permissions for every directory are "drwxr-xr-x". The directory /www contains a file names index.html with the same permissions. Please do not wonder, the time in the errorlog is not correctly. I have no idea what the problem is, i hope someone can help me. my httpd.conf: ServerRoot "/etc/apache2" Listen 80 User daemon Group daemon ServerAdmin [email protected] DocumentRoot "/var/www" Options FollowSymLinks AllowOverride None Order Deny,Allow Deny from all Options Indexes FollowSymLinks AllowOverride All Order allow,deny Allow from all DirectoryIndex index.html Order allow,deny Deny from all Satisfy All ErrorLog /var/apache2/logs/error_log LogLevel warn LogFormat "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined LogFormat "%h %l %u %t \"%r\" %s %b" common <IfModule logio_module> LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio </IfModule> CustomLog /var/apache2/logs/access_log common ScriptAlias /cgi-bin/ "/usr/share/apache2/cgi-bin/" AllowOverride None Options None Order allow,deny Allow from all DefaultType text/plain TypesConfig /etc/apache2/mime.types AddType application/x-compress .Z AddType application/x-gzip .gz .tgz SSLRandomSeed startup builtin SSLRandomSeed connect builtin my error_log: [Sat Jan 01 00:50:26 2000] [notice] caught SIGTERM, shutting down [Sat Jan 01 00:50:33 2000] [warn] Init: Session Cache is not configured [hint: SSLSessionCache] [Sat Jan 01 00:50:34 2000] [notice] Apache/2.2.3 (Unix) mod_ssl/2.2.3 OpenSSL/0.9.8j configured -- resuming normal operations [Sat Jan 01 00:50:36 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied [Sat Jan 01 00:50:37 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied [Sat Jan 01 00:50:37 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied [Sat Jan 01 00:50:37 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied [Sat Jan 01 00:50:38 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied [Sat Jan 01 00:50:38 2000] [error] [client 192.168.1.44] (13)Permission denied: access to / denied

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• Permission denied on /dev/xvdf despite sudo?

  - by Sid

  I'm trying to get a stream off port 9999 and write to /dev/xvdf. I'm using Amazon EC2 with the Ubuntu 11.10 server image. By default I log in as 'ubuntu' which has sudo privileges. However, when I run the following netcat command, I get this error ubuntu@ip-10-252-35-122:~$ ls -al /dev/xv* brw-rw---- 1 root disk 202, 1 2011-11-30 22:22 /dev/xvda1 brw-rw---- 1 root disk 202, 80 2011-11-30 22:27 /dev/xvdf ubuntu@ip-10-252-35-122:~$ sudo netcat -p 9999 -l > /dev/xvdf bash: /dev/xvdf: Permission denied ubuntu@ip-10-252-35-122:~$ Any idea why I get the permission denied error and how I can work around it? Update: Something mysterious is running in the background that resets the permissions? Check the snippet below and the permission flags seem to automatically reset when I try using /dev/xvdf !?! ubuntu@ip-10-252-35-122:~$ sudo chmod 777 /dev/xvdf ubuntu@ip-10-252-35-122:~$ ls -al /dev/xvdf brwxrwxrwx 1 root disk 202, 80 2011-11-30 22:43 /dev/xvdf ubuntu@ip-10-252-35-122:~$ sudo nc -p 9999 -l > /dev/xvdf This is nc from the netcat-openbsd package. An alternative nc is available in the netcat-traditional package. usage: nc [-46DdhklnrStUuvzC] [-i interval] [-P proxy_username] [-p source_port] [-s source_ip_address] [-T ToS] [-w timeout] [-X proxy_protocol] [-x proxy_address[:port]] [hostname] [port[s]] ubuntu@ip-10-252-35-122:~$ ls -al /dev/xvdf brw-rw---- 1 root disk 202, 80 2011-11-30 22:43 /dev/xvdf ubuntu@ip-10-252-35-122:~$ I'm using stock Ubuntu Amazon EC2 images from http://alestic.com/ (links to images at the top)

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