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  • Designing a persistent asynchronous TCP protocol

    - by dogglebones
    I have got a collection of web sites that need to send time-sensitive messages to host machines all over my metro area, each on its own generally dynamic IP. Until now, I have been doing this the way of the script kiddie: Each host machine runs an (s)FTP server, or an HTTP(s) server, and correspondingly has a certain port opened up by its gateway. Each host machine runs a program that watches a certain folder and automatically opens or prints or exec()s when a new file of a given extension shows up. Dynamic IP addresses are accommodated using a dynamic DNS service. Each web site does cURL or fsockopen or whatever and communicates directly with its recipient as-needed. This approach has been suprisingly reliable, however obvious issues have come up and the situation needs to be addressed. As stated, these messages are time-sensitive and failures need to be detected within minutes of submission by end-users. What I'm doing is building a messaging protocol. It will run on a machine and connection in my control. As far as the service is concerned, there is no distinction between web site and host machine -- there is only one device sending a message to another device. So that's where I'm at right now. I've got a skeleton server and a skeleton client. They can negotiate high-quality authentication and encryption. The (TCP) connection is persistent and asynchronous, and can handle delimited (i.e., read until \r\n or whatever) as well as length-prefixed (i.e., read exactly n bytes) messages. Unless somebody gives me a better idea, I think I'll handle messages as byte arrays. So I'm looking for suggestions on how to model the protocol itself -- at the application level. I'll mostly be transferring XML and DLM type files, as well as control messages for things like "handshake" and "is so-and-so online?" and so forth. Is there anything really stupid in my train of thought? Or anything I should read about before I get started? Stuff like that -- please and thanks.

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  • How and where do you manage your domain names?

    - by Saif Bechan
    In the past several years doing web development I often times needed to buy new domain names. I changed registrars a lot also so over the years I have multiple domain names scattered over different registrars all over the world. Now I want to bring a little structure into my business, and I am at the point that I want to be able to have easy control over my domain names in a convenient way. Does anyone have an idea on what the best way is to give structure on this. I have made some suggestions maybe you can comment on them for me. 1) Just leave it as it is I can leave everything as it is. To make adjustments I have to log into different panels, and for some registrars I have to email the changes. 2) Transfer all the domains to one registar This will cost a lot, about 10 usd per domain name. But if I can find a registar where I have full control over DNS this is worth looking at. Can you give me some comments on how you are doing things now. Maybe also which registrar you prefer on doing things.

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  • Can create and delete files through samba, but not modify?

    - by PoppySeeds
    I'm connecting from Windows 7 to Ubuntu Server 10.04 using samba. I can create new files in the share, delete those files, but if I try to edit a file, and then save it, I get an access denied. My User in Windows is the same as the one I'm connecting as and as setup in Ubuntu. This is very odd. I also have trouble copying files to Ubuntu as well. It errors but lets me copy them anyway.

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  • A free WebDAV client for Windows?

    - by Brian L.
    I'd like to copy files from a network drive to a SharePoint site (perhaps as a mapped drive). What's a good client to do so? Obviously Windows (XP) Explorer is bad, I"m trying RichCopy at the moment. Any opinions on CoreFTP? Are there any recommended open-source WebDAV clients?

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  • windows 2000 domain controller

    - by Chris
    in active directory 2000 server i have 5 groups of users and every user has different policies. The problem is that a different desktop loads for only one specific user no matter what changes i make in administrative templates. If i copy this user profile and paste it to another group with a different name windows workaround loads as it should but some policies are not applied. Does anybody know a way to solve this problem instead of creating a new group and user from scratch?

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  • How can I tell who deleted a folder from a public share?

    - by wizard
    Like a lot of offices we have a few public shares for different teams to save their data. Today I helped someone restore some folders from a shadow copy that had been deleted sometime last week. While I had the shadow copies (and backups elsewhere), I couldn't answer the obvious first question. "Who deleted the files?" We're running Windows 2003 server, everyone has active directory accounts.

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  • Solaris 10 very slow ssh file transfers

    - by user133080
    Trying to copy a few TBs betweek Solaris 10 u9 systems A single scp only seems to be able to transfer around 120MB/min, over a 1GB network. If I run multiple scp copies, each one will do 120MB/min, so it is not the network as far as I can see. Any hints on how to tweak the Solaris settings to open a bigger pipe. Have the same problem with another piece of software that unfortunately does not seem to be able to be split into separate processes.

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  • Why did I loose access to the mailboxes on my old web/mail host after changing to a new one but keeping old MX values

    - by LaserBeak
    So I changed the NS records with registrar to point at the new webhosts DNS servers and edited the SOA record there, deleting the new hosts default MX records and instead putting in the old ones for the old web\mail hosts. The website A record is however pointing at the new webhosts servers and the site comes up fine. But none of this should cause me to loose access to mailboxes on my old hosts mail server right? I log into the control panel on the old host, all the mailboxes are there, all the passwords are fine but I can't log in using either webmail or pop3, says incorrect log-in/password. I even created a new mailbox and password for it respectively, but it would not let me log in. For what its worth I did not change\delete the records for 'A' on the old webhost zone file, since I am not hosting the site with them anymore and NS records are pointing to other hosts DNS servers/zone file so that shouldn't matter right? The old hosts mailserver is also not simply down, I can tell because through the control panel I setup a mail forward for one of the existing inboxes and when sending mail to it, it receives it and forwards it fine. So from this I can deduce that I have correctly inputted the old hosts MX records into the zone file hosted on the new hosts DNS and the mail is being sent to the old hosts mail server(s) and is successfully forwarded by it. But why can't I log into those account/inboxes anymore ?

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  • Nginx Removes the index.php from URL

    - by codeHead
    I have a codeigniter php application on nginx. It works as expected on Apache but after moving to nginx, I noticed that the index.php is automatically removed from the URL in all my links. Infact when I try using index.php it does not go to the desired URL but gets redirected to my default controller. below is a coopy of my nginx.conf file. server{ listen 80; server_name mydomainname.com; root /var/www/domain/current; # index index.php; error_log /var/log/nginx/error.log; access_log /var/log/nginx/access.log main; location / { # Check if a file or directory index file exists, else route it to index.php. try_files $uri $uri/ /index.php ; } location ~* \.php { fastcgi_pass backend; include fastcgi.conf; fastcgi_buffer_size 128k; fastcgi_buffers 4 256k; fastcgi_busy_buffers_size 256k; fastcgi_read_timeout 500; #fastcgi_param SCRIPT_FILENAME $document_root/index.php; add_header Expires "Thu, 01 Jan 1970 00:00:01 GMT"; add_header Cache-Control "no-cache, no-store, private, proxy-revalidate, must-revalidate, post-check=0, pre-check=0"; add_header Pragma no-cache; add_header X-Served-By $hostname; } location ~* ^.+\.(css|js)$ { expires 7d; add_header Pragma public; add_header Cache-Control "public"; } # set expiration of assets to MAX for caching location ~* \.(ico|gif|jpe?g|png)(\?[0-9]+)?$ { expires max; log_not_found on; } } I need to use my URL With the index.php -- please help.

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  • Program for getting the cursor's x,y coordinates?

    - by Click Upvote
    Is there a program which lets you easily get the x,y coordinates for your cursor? Basically, I move my cursor to somewhere on my screen, it shows me the x,y coordinates and has an option to copy them to the clipboard or export them somehow. I can already do this if I take a screenshot and open it in MS Paint, then as I move the mouse cursor over the screenshot it shows the coordinates in the status bar, however I have to manually write them down, hence its not convenient.

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  • NTFS.SYS error at boot in Win XP

    - by petergrf
    I am using Windows XP and this morning it didn't boot, it showed an error on "Windows/system32/config/SYSTEM" so I connected the hd to another pc, rename that file and then copy the one in Windows/Repair. And now it shows the error cannot find or corrupted "ntfs.sys". I tried copying ntfs.sys from the windows installation cd but still get the same error, also tried "EXPAND :\i836\ntoskrnl.exe ( and ntkrnlpa.exe ) :\Windows\System32" but the error persist. What other fixes can I try?

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  • Useful keyboard shortcuts on a Mac

    - by warren
    Most Mac OS users know about ⌘-Q for quit. And ⌘-C, ⌘-X, ⌘-V for copy cut and paste. Likewsie ⌘-P for print and ⌘-S for save. Is there a keyboard shortcut for maximizing a window? Or minimizing it? Are there other daily-use keyboard shortcuts you use on your Mac?

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  • How to remove Unicode characters and/or convert OpenOffice spreadsheet cells to plaintext?

    - by gonzobrains
    I have an OpenOffice spreadsheet into which I occasionally copy/paste snippets from web pages. However, I need the file, as a whole, to be free of fancy formatting and non-ASCII text. Is tried highlighting cells and selecting "Default Formatting" but this still seems to keep extraneous characters even though it looks like normal text to the human eye. If this is not possible, is there a way to at least reveal the "raw" data within a cell so that I can manually strip it? Thanks, Jeff

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  • Is there a way to prevent a message from accidentally being sent?

    - by dan
    I am terrified of accidentally sending a reply before I'm finished editing it. Usually what I do is either: copy the email into word, edit in word, then hit reply-to-all in outlook, paste in my text, and send. hit reply-to-all, delete the recipient names, edit, add the recipient names, and send. Is there a way to 'lock' the email so I can't send it while I'm making edits in Outlook? I hate having to switch between programs just so I can edit.

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  • Free web gallery installation that can use existing directory hierarchy in filesystem?

    - by user1338062
    There are several different free software gallery projects (Gallery, Coppermine, etc), but as far as I know each of those creates a copy of imported images in their internal storage, be it directory structure or database). Is there any gallery software that would allow keeping existing directory hierarchy of media files (images, videos), as-is, and just store the meta-data of them in a database? I guess at least various NAS solutions ship with software like this.

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  • Is it possible to upgrade from a clean install in Windows 8?

    - by Misha
    Does Windows 8 support upgrading from a clean install. For example, buying the upgrade key and entering it on a clear install? Or is it functionally necissary to have the version you are upgrading from installed on the computer. The former was the case with Windows 7, but I recal Windows 2000 needed the an installed copy before an update would proceed. I currently have a linux setup and I have the liceanse for Windows 7, but I don't want to have to downoad two 4 GB isos.

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  • Create a certificate file

    - by saeed hardan
    I have a proxy that I want to test. The proxy generates a private key and a certificate like here . I have tried to copy the content as in the link in a file and name it x.CER , then clicked on it and i got the message : This file is invalid for use as the following : Security Certificate how can i install them on windows ? note: I have set in internet options that all the traffic goes throw the proxy

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  • How can I get "Calculated Columns" to work in excel?

    - by Shawn Persels
    Using Excel 2010, I want a single formula to apply to all cells in a column. I see documentation for a feature called "Calculated Columns". That is exactly what I want, but when I follow the instructions I only end up creating a formulate in a single cell - not the whole column. I don't want to use "Fill" or "Copy" because the number or rows in the sheet changes periodically and maintaining the formulas would be very tedious.

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