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• How do the routers communicate with each other ?

  - by Berkay

  Let's say that i want make a request a to a web page which is hosted in Europe (i live in USA).My packets only consist the IP address of the web page, first the domain name to ip address transformation is done, then my packets start their journey through to europe. i assume that MAC addresses never used in this situation? are they? First, my packets deal with many routers on way how these routers communicate with each other?, are router addresses added to my packet headers ? Second, is there a specific path router to router comminication or which conditions affect this route? Third to cross the Atlantic Ocean, are cables used or... ?

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• Sending email with exim and extrnal sender address

  - by Tronic

  hi. i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you!

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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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• Autodiscover service seems to reply with User Principal Name instead of email address

  - by Jeff McJunkin

  After this latest round of Windows updates (on 1/11/11, in fact) my Exchange 2007 server of course rebooted. This may have had the side effect of making any changes I'd inadvertently made take effect. Since then, the Autodiscover service in Exchange 2007 from Outlook 2007 seems to reply with the User Principal Name ([email protected] instead of [email protected]). I'm specifically seeing this from within the "Test Email AutoConfiguration" tool in Outlook (the UPN appears in the first text box labeled "E-mail") and when creating a new profile in Outlook. If I disregard the UPN and instead fill in my email address, Autodiscover works as expected and I can connect without issue. I've confirmed using ADSI Edit that the SMTP email address is properly set for my users. I even went a bit crazy and set the UPN to the email address using ADSI Edit. I've re-installed the Client Access role on the server in question. Exchange server is Server 2008, 64-bit of course. Clients are mostly XP 32-bit, though the issue happens from a Windows 7 machine as well.

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• Sending email with exim and external sender address

  - by Tronic

  i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you! Edit with more details when sending a mail from command line with echo "Test" | mail -s Testmail [email protected] the logs says 2011-01-01 20:45:24 1PZ7OG-0001Vp-Rx <= root@gustav U=root P=local S=360 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx => [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.229.27] X=TLS1.0:RSA_ARCFOUR_MD5:16 DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx Completed and i get the mail on my gmail account. but when sending by webapp (when testing locally with sendmail it works fine) i only get this log output 2011-01-01 20:50:08 1PZ7Sq-0001X9-L4 <= <> R=1PZ7Sq-0001X7-Jo U=Debian-exim P=local S=1780 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.3] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 Completed

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• Postfix "loops back to myself" error on relay to another IP address on same machine

  - by Nic Wolff

  I'm trying to relay all mail for one domain "ourdomain.tld" from Postfix running on port 2525 of one interface to another SMTP server running on port 25 of another interface on the same machine. However, when a message is received for that domain, we're getting a "mail for loops back to myself" error. Below are netstat and postconf, the contents of our /etc/postfix/transport file, and the error that Postfix is logging. (The high bytes of each IP address are XXXed out.) Am I missing something obvious? Thanks - # netstat -ln -A inet Proto Recv-Q Send-Q Local Address Foreign Address State ... tcp 0 0 XXX.XXX.138.209:25 0.0.0.0:* LISTEN tcp 0 0 XXX.XXX.138.210:2525 0.0.0.0:* LISTEN # postconf -d | grep mail_version mail_version = 2.8.4 # postconf -n alias_maps = hash:/etc/aliases allow_mail_to_commands = alias,forward bounce_queue_lifetime = 0 command_directory = /usr/sbin config_directory = /etc/postfix daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix debug_peer_level = 2 default_privs = nobody default_process_limit = 200 html_directory = no inet_interfaces = XXX.XXX.138.210 local_recipient_maps = local_transport = error:local mail delivery is disabled mail_owner = postfix mailbox_size_limit = 0 mailq_path = /usr/bin/mailq manpage_directory = /usr/local/man message_size_limit = 10240000 mydestination = mydomain = ourdomain.tld myhostname = ourdomain.tld mynetworks = XXX.XXX.119.0/24, XXX.XXX.138.0/24, XXX.XXX.136.128/25 myorigin = ourdomain.tld newaliases_path = /usr/bin/newaliases queue_directory = /var/spool/postfix readme_directory = /etc/postfix recipient_delimiter = + relay_domains = ourdomain.tld relay_recipient_maps = sample_directory = /etc/postfix sendmail_path = /usr/sbin/sendmail setgid_group = postdrop smtpd_authorized_verp_clients = $mynetworks smtpd_recipient_limit = 10000 transport_maps = hash:/etc/postfix/transport unknown_local_recipient_reject_code = 450 # cat /etc/postfix/transport ourdomain.tld relay:[XXX.XXX.138.209]:25 # tail -f /var/log/maillog ... Aug 2 23:58:36 va4 postfix/smtp[9846]: 9858A758404: to=<nicwolff@... >, relay=XXX.XXX.138.209[XXX.XXX.138.209]:25, delay=1.1, delays=0.08/0.01/1/0, dsn=5.4.6, status=bounced (mail for [XXX.XXX.138.209]:25 loops back to myself)

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• What are the IPv6 Public and Private and Reserved ranges

  - by vipin raj

  I just want to know what are all the public IPv6 ranges which ISPs or other users can use? Also need a list of addresses which can be used in private networks and also the list of addresses which never can be used in any network. I have been searching through different web sites. But none gives a reliable answer. Actually we are developing an application which allows user to plan their IP address(create supernets, subnets, hosts, assign host to ports etc). So my application should be able to distinguish between all kinds of address ranges, whether it is reserved, public, private, multicast etc

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• Chrome: automatically redirect me to highest ranking search result, like Firefox does

  - by Siim K

  How to emulate the Firefox (I'm using v3.6) address bar search redirection in Google Chrome? For example, if I type... imdb moon ...to the address bar and press Return in Firefox then it redirects me straight to http://www.imdb.com/title/tt1182345/ (and I've not visited the page before) When I try this is Chrome then I just get the google search page http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=imdb+moon So seems like Firefox redirects automatically to the highest ranking search result URL - is there a setting or add-on for Chrome to achieve the same behaviour?

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• Samba access works with IP address only

  - by Sebastian Rittau

  I added a Debian etch host (hostname: webserver, IP address: 192.168.101.2) running Samba to a Windows network with a Windows 2003 PDC (IP address 192.168.101.3). The Samba server exports a public guest share, called "Intranet". The server shows up fine in the network, but trying to click on it produces an error dialog, stating I don't have the necessary permissions. So does entering \webserver manually and using \webserver\internet states that the path does not exist. Interestingly, accessing the share by IP address (\192.168.101.2 or \192.168.101.2\intranet) works fine. DNS is configured correctly, and "smbclient //webserver/intranet" on another Linux client works fine. One complicating issue is that the webserver is only a VMware virtual machine running on PDC server. Here is our smb.conf: [global] workgroup = Foobar server string = Webserver wins support = yes ; commenting out these wins server = 192.168.101.3 ; two lines has no effect dns proxy = no guest account = nobody [... snipped some unrelated bits, like logging ...] security = share [... snipped some password-related things ...] domain master = no [intranet] comment = Intranet path = /srv/webserver/contents browseable = yes guest ok = yes guest only = yes read only = yes create mask = 0775 directory mask = 0775

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• Sending email with exim and external sender address

  - by Tronic

  hi. i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you!

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• Why is it a bad idea to use a customer email as the from address

  - by Crab Bucket

  I've got an application that emails users once they have filled in a form. It uses a [email protected] as a from address. The customer wants it to use the email from the form as the from address which could be anything. I have been told that this is a bad idea due to spoofing/blacklisting and spam. I feel really vague about the exact reason about why this is a bad idea particularly as i've got to try to counsel the client out of this. Can someone explain to me why this is a bad idea. Interestingly the client has used a gmail account as the from address as a demo which not only works fine but has enabled the application to start sending emails (it wouldn't do it before with an email which was [email protected]). Erm - what is going on. I'm told one thing and the opposite works. Sorry - i know this is basic but I could find anything on a google search. Largely I think because I'm having trouble even framing the question. EDIT Thank you everyone - great answers. Interestingly the server sending the email and the mail box that it is going to are both behind the same firewall so the client says they are unconcerned about spam. Oh well.

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• How to set a static route for an external IP address

  - by HorusKol

  Further to my earlier question about bridging different subnets - I now need to route requests for one particular IP address differently to all other traffic. I have the following routing in my iptables on our router: # Allow established connections, and those !not! coming from the public interface # eth0 = public interface # eth1 = private interface #1 (10.1.1.0/24) # eth2 = private interface #2 (129.2.2.0/25) iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -m state --state NEW ! -i eth0 -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -i eth0 -o eth2 -m state --state ESTABLISHED,RELATED -j ACCEPT # Allow outgoing connections from the private interfaces iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT iptables -A FORWARD -i eth2 -o eth0 -j ACCEPT # Allow the two private connections to talk to each other iptables -A FORWARD -i eth1 -o eth2 -j ACCEPT iptables -A FORWARD -i eth2 -o eth1 -j ACCEPT # Masquerade (NAT) iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # Don't forward any other traffic from the public to the private iptables -A FORWARD -i eth0 -o eth1 -j REJECT iptables -A FORWARD -i eth0 -o eth2 -j REJECT This configuration means that users will be forwarded through a modem/router with a public address - this is all well and good for most purposes, and in the main it doesn't matter that all computers are hidden behind the one public IP. However, some users need to be able to access a proxy at 192.111.222.111:8080 - and the proxy needs to identify this traffic as coming through a gateway at 129.2.2.126 - it won't respond otherwise. I tried adding a static route on our local gateway with: route add -host 192.111.222.111 gw 129.2.2.126 dev eth2 I can successfully ping 192.111.222.111 from the router. When I trace the route, it lists the 129.2.2.126 gateway, but I just get * on each of the following hops (I think this makes sense since this is just a web-proxy and requires authentication). When I try to ping this address from a host on the 129.2.2.0/25 network it fails. Should I do this in the iptables chain instead? How would I configure this routing?

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• Change source address based on destination IP

  - by hgj

  We have several "router" machines that gather a lot of external IP addresses on the same host and redirect, NAT or proxy the traffic to the internal network. They also act as routers for the machines on the internal network. This works fine, however I am unable to make the routing table, so I can change the source address, based on the destination a machine from the internal network want to access. Let's say I have a router, that has public addresses P1 (5.5.5.1/24) and P2 (5.5.5.2/24). All traffic goes through P1, but if necessary, the host is reachable on P2 too. This looks like this and works fine: > ip addr ... 1: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether aa:bb:cc:dd:ee:11 brd ff:ff:ff:ff:ff:ff inet 5.5.5.1/24 brd 5.5.5.255 scope global eth1 inet 5.5.5.2/24 brd 5.5.5.255 scope global secondary eth1:p2 ... Now I want to use P2 as the source address, if I want to access the Google DNS service for example (8.8.8.8). So I add a row in the routing table like: > ip route add 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 > ip route ... default via 5.5.5.254 dev eth1 5.5.5.0/24 dev eth1 proto kernel scope link src 5.5.5.1 8.8.8.8 via 5.5.5.254 dev eth1 src 5.5.5.2 ... But this does not work. If I ping 8.8.8.8, the host still uses P1 as the source address, and does not use P2 at all for outgoing connections. Am I doing it right? I guess not...

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• Accessing locally hosted webpage via public IP

  - by Mk12

  Sorry if this is in the wrong place.I don't really know anything about server-related things, but I'm really curious about this. On my mac I figured out how to make a simple web page viewable via the local ip address or computer name on the LAN, and also how to hook it up with a free hostname from dyndns.com. So the dyndns hostname points to something, how can I access it directly? Typing in the global ip address (of the router) doesn't work, but if it did, how would it know which computer to point to? There must be some way of directly accessing what dyndns hostname points to by typing in some number, right? Sorry I don't really understand how it works.

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• Is it possible to host a web server from behind a NAT

  - by iamrohitbanga

  My PC is behind a NAT router that has a public IP address. If I want to host a website then I believe I need a domain name which I can purchase from some site which would pledge to resolve all DNS requests for that domain name and send the IP address of my NAT router (assuming I do not want to host my domain name on their servers). Now I want to host a web server on my computer. What changes should be done to the NAT router's configuration to forward all HTTP requests for example.com to my PC in the internal network. Is the above strategy correct? Is it commonly used?

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• iptables, allow access from certain MAC addresses

  - by user788171

  Presently, I limit which clients can access my server by using IP addresses via iptables, only approved IP addresses can connect. However, the problem with this is if a client is on a laptop and goes to a different location, they can no longer connect because the IP has changed. For a variety of reasons, iptables authentication is the only option I have. Is there a way to restrict access by device instead of ip address. For instance, only allow certain MAC address to connect to port 5000. Is it possible to do this via iptables? Note, the computers are not on the same network, they could be connecting from anywhere in the world.

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• Samba access works with IP address only

  - by Sebastian Rittau

  I added a Debian etch host (hostname: webserver, IP address: 192.168.101.2) running Samba to a Windows network with a Windows 2003 PDC (IP address 192.168.101.3). The Samba server exports a public guest share, called "Intranet". The server shows up fine in the network, but trying to click on it produces an error dialog, stating I don't have the necessary permissions. So does entering \webserver manually and using \webserver\internet states that the path does not exist. Interestingly, accessing the share by IP address (\192.168.101.2 or \192.168.101.2\intranet) works fine. DNS is configured correctly, and "smbclient //webserver/intranet" on another Linux client works fine. One complicating issue is that the webserver is only a VMware virtual machine running on PDC server. Here is our smb.conf: [global] workgroup = Foobar server string = Webserver wins support = yes ; commenting out these wins server = 192.168.101.3 ; two lines has no effect dns proxy = no guest account = nobody [... snipped some unrelated bits, like logging ...] security = share [... snipped some password-related things ...] domain master = no [intranet] comment = Intranet path = /srv/webserver/contents browseable = yes guest ok = yes guest only = yes read only = yes create mask = 0775 directory mask = 0775

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• Dns.GetHostEntry is not giving me a good IP to pass to IPEndPoint function in my domain

  - by Beach Miles

  My c# code from my asynchronous socket client to get the address of my socket server. string testServerIP = "192.168.0.1"; IPHostEntry ipHostInfo = Dns.GetHostEntry(testServerIP); //time server address IPAddress ipAddress = ipHostInfo.AddressList[0]; IPEndPoint remoteEP = new IPEndPoint(ipAddress, port); I get the following error message from the above code. CheckServerReconnect:Cant connect to 192.168.0.1 The requested name is valid and was found in the database, but it does not have the correct associated data being resolved for

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• ASP.NET MVC File Upload Error - "The input is not a valid Base-64 string"

  - by Justin

  Hey all, I'm trying to add a file upload control to my ASP.NET MVC 2 form but after I select a jpg and click Save, it gives the following error: The input is not a valid Base-64 string as it contains a non-base 64 character, more than two padding characters, or a non-white space character among the padding characters. Here's the view: <% using (Html.BeginForm("Save", "Developers", FormMethod.Post, new {enctype = "multipart/form-data"})) { %> <%: Html.ValidationSummary(true) %> <fieldset> <legend>Fields</legend> <div class="editor-label"> Login Name </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.LoginName) %> <%: Html.ValidationMessageFor(model => model.LoginName) %> </div> <div class="editor-label"> Password </div> <div class="editor-field"> <%: Html.Password("Password") %> <%: Html.ValidationMessageFor(model => model.Password) %> </div> <div class="editor-label"> First Name </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.FirstName) %> <%: Html.ValidationMessageFor(model => model.FirstName) %> </div> <div class="editor-label"> Last Name </div> <div class="editor-field"> <%: Html.TextBoxFor(model => model.LastName) %> <%: Html.ValidationMessageFor(model => model.LastName) %> </div> <div class="editor-label"> Photo </div> <div class="editor-field"> <input id="Photo" name="Photo" type="file" /> </div> <p> <%: Html.Hidden("DeveloperID") %> <%: Html.Hidden("CreateDate") %> <input type="submit" value="Save" /> </p> </fieldset> <% } %> And the controller: //POST: /Secure/Developers/Save/ [AcceptVerbs(HttpVerbs.Post)] public ActionResult Save(Developer developer) { //get profile photo. var upload = Request.Files["Photo"]; if (upload.ContentLength > 0) { string savedFileName = Path.Combine( ConfigurationManager.AppSettings["FileUploadDirectory"], "Developer_" + developer.FirstName + "_" + developer.LastName + ".jpg"); upload.SaveAs(savedFileName); } developer.UpdateDate = DateTime.Now; if (developer.DeveloperID == 0) {//inserting new developer. DataContext.DeveloperData.Insert(developer); } else {//attaching existing developer. DataContext.DeveloperData.Attach(developer); } //save changes. DataContext.SaveChanges(); //redirect to developer list. return RedirectToAction("Index"); } Thanks, Justin

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• "must be convertible to System.Web.UI.Page" using custom base page in Visual Studio 2010

  - by Payton Byrd

  I have a HUGE problem. We just converted our large project to a Visual Studio 2010 solution, but maintained .Net 3.5 targets. This seemed to go swimmingly, almost too easy. Today I just encountered a huge problem. When we add a new asp.net tag to a page the designer class is not being updated. I looked around and noticed that the type specified in the Page's Inherits attribute was underlined in red. Hovering over that gives the error "must be convertible to System.Web.UI.Page". Obviously the designer isn't casting the page correctly and it's because we are using a custom base page, just as we had been with no problems in VS 2008. Has anyone else encountered this problem? If so, what's the solution. This is a show-stopper for us to use VS 2010 (and lots of egg on our faces for moving to it in the first place).

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• Base URL in ASP.net Master Pages with virtual Directories

  - by Ian

  Hi All, I have an ASP.net master page. In this master, I have all my css and javascript files defined. I also have a few images and a few buttons and hyperlinks. All the urls are all declared as relative ie "/scripts/ian.js" Everything works fine if this site is the root website, but I need it to work in a virtual directory. My problem is when I place this website in a virtual directory under a root site, all my links are pointing to the root site. so my links point to www.root.com/scripts/ian.js but it should be pointing to www.root.com/virtualDir/scripts/ian.js I thought the Base Href tag in the header would help, but so far it does not seem to be helping in anyway. All the links are still pointing to the root website when i hover over them. Any suggestions or ideas are welcome. Thanks

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• Always handle the PreviewKeyDown event in a base form

  - by Byron Ross

  We need to handle this event in the base form, regardless of which controls currently have focus. We have a couple of global key commands that need to work regardless of control focus. This works by handling the PreviewKeyDown event in the form normally. When we add a user control to the form, the event no longer fires. Am I missing something trivial here? Or do we need to handle the event in the user control first? Thanks for your help! Thanks Factor. When I get more time :) I'll get it working 'properley'!

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• iPhone Simulator chrashes in NSKeyedUnarchiver after setting base SDK

  - by Florian

  Hi! I started a project in xcode (3.2 on snow leopard) with base sdk 3.1.2. Now I changed this setting to 3.0 and it compiles without a warning. There are no problems running the app on the device, but the simulator crashes on launch every time with the following exception: Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '[NSKeyedUnarchiver initForReadingWithData:]: incomprehensible archive (0x4e, 0x49, 0x42, 0x41, 0x72, 0x63, 0x68, 0x69)' I do not use the NSKeyedUnarchiver, so why is the app trying to call it? And what archive is incomprehensible? I reset the simulator before building, so there are no userDefaults or anything else around. Thanks for your help!

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• Stack / base pointers in assembly

  - by flyingcrab

  I know this topic has been covered ad-naseum here, and other places on the internet - but hopefully the question is a simple one as I try to get my head around assembly... So if i understand correctly the ebp (base pointer) will point to the top of the stack, and the esp (stack pointer) will point to the bottom -- since the stack grows downward. esp therefore points to the 'current location'. So on a function call, once you've saved the ebp on the stack you insert a new stack frame - for the function. So in the case of the image below, if you started from N-3 you would go to N-2 with a function call. But when you are at N-2 - is your ebp == 25 and the esp == 24 (at least initially, before any data is placed on the stack)? Is this correct or am I of on a tangent here? Thanks!

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• Django IN query as a string result - invalid literal for int() with base 10

  - by bmelton

  Trying to query a 'Favorites' model to get a list of items a user has favorited, and then querying against a different model to get the objects back from that query to present to the template, but I'm getting an error: "invalid literal for int() with base 10" Looking over all of the other instances of that error, I couldn't find any in which the asker actually wanted to work with a comma separated list of integers, so I'm kind of at a loss. Model class Favorite(models.Model): # key should be the model name, id is the model.id, and user is the User object. key = models.CharField(max_length=255, unique=True) val = models.IntegerField(default=0) user = models.ForeignKey(User) class Admin: list_display = ('key', 'id', 'user') View def index(request): favorites = Favorite.objects.filter(key='blog', user=request.user.pk) values = "" for favorite in favorites: values += "%s," % favorite.val #values = "[%s]" % values blogs = Blog.objects.filter(pk__in=values) return render_to_response('favorite/index.html', { "favorites" : favorites, "blogs" : blogs, "values" : values, }, context_instance=RequestContext(request) ) enter code here

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