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• Postfix how to triggering my script when outgoing email status is sent?

  - by Laszlo Malina

  I want to run a program when postfix has successfully sent out a mail (local or remote). I would like to pass the headers to program and if possible also the destination ip or address (exclude spam filter delivery). I just have an idea: Delivery Status Notification processing via uniqe transport program, but I'd prefer the above. My goal is to be recorded lifetime (events) of email: it came, it went out (from, to, subject, datetime, message id, message status: bounce, sent). I would only need the state of the outgoing mail, because incoming and bounce program is working. It is possible to trigger a program (similar to a transport pipe/spawn) or DSN "cheat" stay? Thanks in advance for any reply!

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• Grant relay to servers based on AD security group membership

  - by john

  We're moving our relay from an Exchange 2003 server to an Exchange 2010 server. I was hoping the "Grant or deny relay permissions to specific users or groups" option would still be available in some form, but I can't find out how to do it. I've read up on recieve connectors and so far I can't get it to work. I have edited the security on the Recieve Connector to allow the following extended rights to the group and added computer accounts to that group: Accept Routing Headers Bypass Anti-spam Submit to Server Accept any Sender Accept any Recipient Then I suddenly realised while testing... How would the receive connector resolve the permission to a particular AD object, maybe a reverse DNS lookup? What I'd like to know is if what I'm trying to achieve is possible, and how it would be possible. I would rather not revert to an IP-based list as this is not as manageable, and I'm trying to avoid creating static IPs/reservations for a number of workstations that would otherwise not need them.

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• Allow from referer for HTTP-basic protected SSL apache site

  - by user64204

  I have an apache site protected by HTTP basic authentication. The authentication is working fine. Now I would like to bypass authentication for users that are coming from a particular website by relying on the HTTP Referer header. Here is the configuration: SetEnvIf Referer "^http://.*.example\.org" coming_from_example_org <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Deny from all Allow from env=coming_from_example_org AuthName "login required" AuthUserFile /opt/http_basic_usernames_and_passwords AuthType Basic Require valid-user Satisfy Any </Directory> This is working fine for HTTP, but failing for HTTPS. My understanding is that in order to inspect the HTTP headers, the SSL handshake must be completed, but apache wants to inspect the <Directory> directives before doing the SSL handshake, even if I place them at the bottom of the configuration file. Q: How could I workaround this issue? PS: I'm not obsessed with the HTTP referer header, I could use other options that would allow users from a known website to bypass authantication.

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• haproxy access list using path_dir having issues with firefox

  - by user11243

  I'm trying to route all requests containing a path directory of /socket.io/ to a separate port with HAProxy. Here is my config file: global maxconn 4096 # Total Max Connections. This is dependent on ulimit nbproc 2 defaults mode http frontend all 0.0.0.0:80 timeout client 86400000 default_backend web_servers acl is_stream path_dir socket.io use_backend stream_servers if is_stream backend web_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout server 30000 timeout connect 4000 server web1 127.0.0.1:4000 weight 1 maxconn 1024 check backend stream_servers balance roundrobin option forwardfor # This sets X-Forwarded-For timeout queue 5000 timeout server 86400000 timeout connect 86400000 server stream1 127.0.0.1:5100 weight 1 maxconn 1024 check URL paths with a /socket.io/ get correctly directed to port 5100 in chrome and safari. However not for firefox. I'm running Haproxy locally on my mac for dev, not sure if it has anything to do with it. I'm using haproxy 1.4.8 and Firefox 3.6.15. I've tried clearing cache on firefox and it didn't help, so I'm thinking there's something wrong with the way HAProxy parses through the Firefox request headers.

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• How to prove that an email has been sent?

  - by bguiz

  Hi, I have a dispute on my hands in which the other party (landlord's real estate agent) dishonestly claims to not have received an email that I truly did send. My questions is, what are the ways to prove that the email was indeed sent? Thus far, the methods that I have already thought of are: Screenshot of the mail in the outbox Forwarding a copy of the original email I am aware of other things like HTTP/ SMTP headers etc that would exist as well. Are these useful for my purposes, and if so how do I extract these? The email in question was sent using Yahoo webmail ( http://au.mail.yahoo.com/ ). Edit: I am not seeking legal advice here, just technical advice as to how to gather this information.

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• Configure spamassassin to mark very similar messages as spam

  - by Caleb Gray

  Users on my server have been receiving spam, consistently, for some time now. I have most of spamassassin's plugins enabled, and I have made sure to enable verbose logging, where I can see that all of the plugins are working. Why is it, then, that my users are able to receive the same exact junk mail several times in a day without the message being flagged in some way? Here are the relevant headers of an email that I personally have received several copies of: X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on sub.domain.tld X-Spam-Level: *** X-Spam-Status: No, score=3.0 required=4.0 tests=BAYES_50,FSL_HELO_NON_FQDN_1, HELO_NO_DOMAIN,HTML_MESSAGE,RCVD_IN_BRBL_LASTEXT,RDNS_NONE autolearn=no version=3.3.1 Have I accidentally missed the plugin that can see that I, and others, have received the same message multiple times in a short period of time?

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• Demoted domain controller and now IIS has permissions issues

  - by tladuke

  I have a machine that was a domain controller and everything else, includin an IIS site. I built new 2 new domain controllers and transferred the FSMO roles and waited a day and then demoted the original domain controller. Now the IIS site says : HTTP Error 401.2 - Unauthorized You are not authorized to view this page due to invalid authentication headers. I have a call in with the web app vendor, but maybe someone can guess what I need to fix now. I haven't looked at IIS since this was installed and am pretty lost. I thought about restoring the machine from a backup, but I think that would be an Active Directory disaster, right? The server is Windows 2008 (not R2). The new DCs are 2008 R2

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• PHP/mail : server sends email originating from wrong domain

  - by Niro

  I have a Mediatemple dv (Plesk) server with two domains, each has static IP. I had domain1 as main domain and domain2 as secondary. When A PHP script from domain2 sends email the headers show the IP address of domain1 as the origin. Received: from domain2.com (domain1.com [70.ipof domain1]). I want only domain2 to be mentioned so I did the following: Changed server name to domain2.com made domain2.com the primary domain (about 30 hours ago) made fixed IP address of domain2.com the default address for the server. Still when the script sends emails I see the same info as above in the header. What do I need to do to make the email origin domain2.com?

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• Is Winpcap able to capture all packets going through a Gigabit NIC without missing any packets?

  - by Patrick L

  I want to use Winpcap to capture all network packets going through a Gigabit NIC of a server. Assuming that I am able to utilize the network link up to 100%, the maximum network speed is 1000Mbps. If we exclude the TCP/IP headers, the maximum TCP data rate should be roughly 940Mbps. Let's say I send a 1GB file through the NIC at 940Mbps using TCP destination port 6000. I use Winpcap to capture all network packets going through the NIC and then dump it to a pcap file. If I use Wireshark to analyze the pcap file and then check the sum of packet size for all network packets sent to TCP port 6000, am I able to get exactly 1GB from the pcap file? Thanks.

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• Requesting better explanation for etag/expiration of favicon.ico

  - by syn4k

  Following this article: Configuring favicon with expires header in htaccess Using YSlow, I keep getting: (no expires) http://devwww.someplace.com/favicon.ico Also, YSlow indicates: Grade C on Configure entity tags (ETags) for the same file. My relevant config (.htaccess): # Configure ETags FileETag MTime Size <IfModule mod_expires.c> # Enable Expires Headers for this directory and sub directories that don't override it ExpiresActive on # Set default expiration for all files ExpiresDefault "access plus 24 hours" # Add Proper MIME-Type for Favicon AddType image/x-icon .ico # Set specific expriation by file type ExpiresByType image/x-icon "access plus 1 month" ExpiresByType image/ico "access plus 1 month" ExpiresByType image/icon "access plus 1 month" </IfModule> As you can see, I am setting both, etags and expiration however, both seem to be ignored. Yes, mod_expires is being loaded by my Apache configuration.

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• Emails intended as HTML are received as plain text

  - by Jeremy

  I'm regularly receiving emails from a well-known public website that read as plain text without carriage breaks or effective hyperlinks. My email client is Thunderbird. Thunderbird helpsite doesn't display an answer. And I'm reluctant to complain to the website if the problem is at my end. Message source for headers includes this: Content-Type: multipart/alternative; boundary=--boundary_9338_03b8c925-816e-4b55-95c4-b2593da7e5f6 The content in message source that follows the header is preceded by this: ----boundary_9338_03b8c925-816e-4b55-95c4-b2593da7e5f6 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: base64 The content itself in message source reads typically like this: PCFkb2N0eXBlIGh0bWwgcHVibGljICItLy9XM0MvL0RURCBIVE1MIDQuMCBUcmFuc2l0aW9u YWwvL0VOIj4NCg0KDQo8aHRtbD4NCjxoZWFkPg0KPG1ldGEgaHR0cC1lcXVpdj0iQ29udGVu, etc.,etc. And, as I've said, the message in the viewing pane is unadulterated plain text. Can you tell me - where is it all going wrong? Thanks.

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• auspex LFS backups

  - by user1250465

  I have some backup tapes which existed on an AUSPEX file server. The backups were written to tape with the SunOs version of the CPIO command. Now that I need to restore them, (of course there are no more auspex servers in existance), the backups won't restore because the headers are not standard. I have dumped the tape images to disk. PAX, CPIO, and TAR cannot read the images. I've tried all of the CPIO format options. The errors I get are "name too long", "byte swapped in header", or just junk output. I can open up the images and read the contents of the files, but cannot restore the images. I have found that SunOs had a special header in CPIO V2.5 images. I have found the source for cpio, now I need definition of the SunOs header inside CPIO?

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• Large keepalive_requests values are severely slowing-down Nginx

  - by Gil

  When running a bacon (43-byte transparent pixel) load test on Nginx, we have tried several keepalive_requests values (from 10 to 100,000) and the optimal value seems to be 10. Here are the server HTTP headers of this tiny reply: HTTP/1.1 200 OK Server: nginx/1.5.6 Date: Wed, 23 Oct 2013 12:39:45 GMT Content-Type: image/gif Content-Length: 43 Last-Modified: Mon, 28 Sep 1970 06:00:00 GMT Connection: keep-alive Nginx is twice slower with keepalive_requests 100000 than with keepalive_requests 10. Can you help understanding that result? Or tell what we do wrong? For reference, here is the nginx.conf file.

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• NGINX 301 and 302 serving small nginx document body. Any way to remove this behaviour?

  - by anonymous-one

  We have noticed that when using nginx internal 301 and 302 handling, nginx will serve a small document body with the appropriate Location: ... header. Something along the lines of (in html): 301 redirect - nginx. As appropriate in the above behaviour, a content-type text/html and content-length header is also sent. We do a lot of 302 and some 301 redirects, the above behaviour is wasted bandwidth in our opinion. Any way to disable this behaviour? One idea that crossed our mind was to set error_page 301 302 to an empty text file. We have not tested this yet, but I am assuming even with the above, the content-type and content-length (0) headers will be sent. So, is there a clean way to send a "body-less" 301/302 redirect with nginx?

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• How do I find out what a Spam Custom Rule is?

  - by SoaperGEM

  We use a Barracuda Spam Filter at work, and we also provide a mass emailing program to some of clients that send out newsletters. Lately one of them's been composing his latest company newsletter and has been trying to send preview messages to himself, but they've actually been quarantined by Barracuda as potential spam, even though they aren't. I can see the breakdown of the spam scoring headers in Barracuda, but I'm not sure what certain rules mean. Here's the breakdown: pts rule name description ---- ---------------------- -------------------------------------------------- 0.00 FUZZY_CPILL BODY: Attempt to obfuscate words in spam 2.21 HTML_IMAGE_ONLY_24 BODY: HTML: images with 2000-2400 bytes of words 0.00 HTML_MESSAGE BODY: HTML included in message 0.50 BSF_SC0_SA_TO_FROM_ADDR_MATCH Sender Address Matches Recipient Address 1.00 BSF_SC0_SA392f Custom Rule SA392f What is "Custom Rule SA392f"? Where do I find descriptions of these custom rules? And what does "images with 2000-2400 bytes of words" mean? Is that referring to the file size of the image, or something about the attributes on the <img> tag?

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• Force users to access SSL site using specific host header

  - by mwillmott

  Hi, So i am running IIS7 with one SSL site on it. I have a few different domains and subdomains that all point to my external IP. When using http they all direct to their respective sites using host headers. Whenever someone uses https on any of the domains they all point to my SSL site. I only want people who type in https://sub.domain.com (for example) to end up at my secure site and for anything else to just not go there, it can throw an error or direct to the http version, it doesn't matter. Is there a way of getting IIS7 to check the host header and throw an error if it doesn't match my specific subdomain? Thanks, Michael

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• What are the advantages of DKIM?

  - by duff

  After making my server sign outgoing email I started to wonder what the benefits are. This is the opposite of a previously asked question. Naively I see two benefits: We can throw away all emails which don’t carry a valid signature: Wrong! Mail forwarders (like Mailman) will produce emails from someone at «domain which signs» which are not signed correctly (in their forwarded shape). We can skip spam checking on signed email: Wrong! A spammer can send a single email through e.g. gmail.com and then resend that email as-is (w/o changing headers) to a million people. So what are the selling points of DKIM?

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• How to get the best LINPACK result and conquer the Top500?

  - by knweiss

  Given a large Linux HPC cluster with hundreds/thousands of nodes. What are your best practices to get the best possible LINPACK benchmark (HPL) result to submit for the Top500 supercomputer list? To give you an idea what kind of answers I would appreciate here are some sub-questions (with links): How to you tune the parameters (N, NB, P, Q, memory-alignment, etc) for the HPL.dat file (without spending too much time trying each possible permutation - esp with large problem sizes N)? Are there any Top500 submission rules to be aware of? What is allowed, what isn't? Which MPI product, which version? Does it make a difference? Any special host order in your MPI machine file? Do you use CPU pinning? How to you configure your interconnect? Which interconnect? Which BLAS package do you use for which CPU model? (Intel MKL, AMD ACML, GotoBLAS2, etc.) How do you prepare for the big run (on all nodes)? Start with small runs on a subset of nodes and then scale up? Is it really necessary to run LINPACK with a big run on all of the nodes (or is extrapolation allowed)? How do you optimize for the latest Intel/AMD CPUs? Hyperthreading? NUMA? Is it worth it to recompile the software stack or do you use precompiled binaries? Which settings? Which compiler optimizations, which compiler? (What about profile-based compilation?) How to get the best result given only a limited amount of time to do the benchmark run? (You can block a huge cluster forever) How do you prepare the individual nodes (stopping system daemons, freeing memory, etc)? How do you deal with hardware faults (ruining a huge run)? Are there any must-read documents or websites about this topic? E.g. I would love to hear about some background stories of some of the current Top500 systems and how they did their LINPACK benchmark. I deliberately don't want to mention concrete hardware details or discuss hardware recommendations because I don't want to limit the answers. However, feel free to mention hints e.g. for specific CPU models.

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• How do I extract excel data from multiple worksheets and put into one sheet?

  - by user167210

  In a workbook I have 7 sheets(Totals and then Mon to Sat),I want to extract rows which have the word "CHEQ" in its cell (this is a dropdown list with two options-CHEQ/PAID)from all sheets. On my front sheet I used this formula: =IF(ROWS(A$13:A13)>$C$10,"",INDEX(Monday!A$3:A$62,SMALL(IF(Monday[Paid]=$A$10,ROW(Monday[Paid])-ROW(Monday!$I$3)+1),ROWS(A$13:A13)))) This formula works fine for one worksheet (eg. Monday) but is it possible to show the extracted rows from all 6 sheets on the front page? I only have Excel NOT Access. These are the 12 headers on row A12 Col Name Cod House Car Date Discount 2nd Paid Extra Letter Posted The exported data appears like this (this just an example): Col Name Cod House Car Date Discount 2nd Paid Extra Letter Posted 12 Robbs 1244 Ren 11/10 10% 5 CHEQ 0 0 No 15 Jones 7784 Ren 12/10 15% 1 CHEQ 0 0 No 18 Doese 1184 Ren 12/11 12% 1 CHEQ 0 0 No Any ideas on what to do to this formula? I am using Excel 2010.

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• HTTP resource caching / fetching

  - by Bobby Jack

  I'm trying to optimise a page, and I'm seeing some strange behaviour. Each time I click on a link to the page, all resources are fetched from the server, responding with 200s. However, when I refresh the page (specifically, F5 in Firefox), all resources return a 304 and - of course - the page loads much faster as a result. The main page returns a 200 in both cases. In the refresh case, If-Modified-Since headers are sent with the requests to the resources. However, in the 'clicking a link' case, they are not. What's the reason for that, and can I control it?

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• Are there other application layer firewalls like Microfot TMG (ISA) that do advanced http rules?

  - by Bret Fisher

  Since the old days ISA and now TMG have had several great features that I often want to deploy to my customers because of the enhanced functionality and security, but often the cost of an additinal server HW, Windows Server, and TMG license is too much to justify when compaired to a $300-500 appliance. Are there other gateway firewalls that can perform one or more of these application layer features: pre-auth incoming http traffic against AD/LDAP before sending packets to internal server (forms auth or basic creds popup)? read host headers of incoming http traffic (even on https) to a single public IP and route packets to different internal servers based on that host header?

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• Migrating websites from IIS 6 to Apache Tomcat

  - by Cheeky

  I have 4 CFML coded websites currently running on Railo 3 (CFML engine using Resin) and IIS. I would like to upgrade my server and websites to Railo 4, which no longer uses Resin, but runs on Apache Tomcat. I have quite limited knowledge when it comes to web servers and I wanted to know what the process would be to move the websites from Railo 3 to Railo 4 without disrupting the live sites? Would there still be a need for IIS after the installation of Apache Tomcat? Does Tomcat run through IIS or are they two completely different things and would it be a complete move from IIS to Tomcat? If so, where would one then manage all those things one normally does in IIS, like default documents and host headers etc? Any advice would be extremely appreciated.

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• How to figure out which directory is web server root?

  - by matt

  I want to view websites hosted on my Mac when running Windows VMware Fusion. I have an entry in the Windows hosts file to enable the routing: #ip of my mac domain i use on the VM to access it 192.168.1.70 mymac However, it resolves to an empty directory as a 404 is generated. I can see the access log on my Mac that everything is OK access wise. Firefox on VMware states the following response headers: Server Apache/2.2.14 (Unix) mod_ssl/2.2.14 OpenSSL/0.9.8l DAV/2 PHP/5.3.1 Any ideas how I can figure out what directory is being served? I am lost in a maze of twisty httpd.conf passages. localhost on my Mac resolves to my ~/Sites directory. 192.168.1.70 resolves to the same empty directory/404. Thanks.

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• HTTP Caching Server that supports POST

  - by Jeroen

  I am hosting a REST service which is sending appropriate cache-control headers. I use Varnish as a caching server in front of my webserver. However, a limitation of varnish is that it doesn't support caching HTTP POST and HTTP PUT. Is there any alternate caching server that will be able to cache these requests? I understand that caching POST is a bit tricky because you cannot just cache based on the url as a key like for GET; it needs to actually inspect the request body. In case of multipart/form-data requests, there should probably be a limit on the size of the request body for it to be cached (so that big file uploads, etc won't be cached). Nevertheless I really want to be able to cache short HTTP POST, or at least the application/x-www-form-urlencoded ones.

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• CGI error from PHP when running exec() on IIS

  - by Patrick

  Windows Server 2003 x64 PHP 5.2 IIS 6.0 The program Ink2Png.exe is set with Everyone-Read and Execute permissions. As does its dependency (microsoft.ink.dll) PHP Safe Mode is off exec() is passed [the full exe path], space, [full path to another file] This other file also has full read permissions. The output directory has full write permissions. As soon as exec() is hit, the connection dies, the browser does not even receive a full set of http headers, and it reports a CGI error. Examining the output, it appears the program was not even run. Any ideas? How can I figure out what exactly is happening and get it running again? EDIT: Also, it is a .NET application, if that is significant in any way.

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