Looks like a Debian problem...

*** Bug 124479 has been marked as a duplicate of this bug. ***

I can confirm that after upgrading from kde 3.5.1 to 3.5.2, konqueror does not process any more a bluetooth:/ url but complains of a undefined url.
Though, konqueror still opens my bluetooth device with an obex protocol: obex://[00:0e:ed:ae:d7:3b]:11/

Do you have a bluetooth.protocol file in your system?

Thiago: yes I have /usr/share/services/bluetooth.protocol - which contains:

[Protocol]
exec=kio_bluetooth
protocol=bluetooth
input=none
output=filesystem
reading=true
Icon=kdebluetooth
Description=Bluetooth inquiry protocol
Description[da]=Bluetooth forespørgselsprotokol
Description[et]=Bluetoothi päringuprotokoll
Description[fr]=Protocole de Demande de renseignements Bluetooth
Description[it]=Protocollo di richiesta Bluetooth
Description[nl]=Bluetooth inquiry-protocol
Description[pt]=Protocolo de inquisição Bluetooth
Description[pt_BR]=Protocolo de inquisição Bluetooth
Description[sv]=Blåtand frågeprotokoll
Description[ta]=புளூடூததை உளளிடும நெறிமுறை
Description[xx]=xxBluetooth inquiry protocolxx
maxInstances=3
DocPath=kdebluetooth/components.kio_sdp.html

A similar thing happens here on my Gentoo machine, attempting to go to 'bluetooth:/' in konqueror results in it complaining of a malformed url, this has only occurred since upgrading to kde 3.5.2

Also using the alt+f2 run command dialog to go to 'bluetooth:/' results in it complaining "is a folder, but a file was expected." This also occured with kde 3.5.1

Pavel, if you have a patch fixing the bug, can you attach it here or close this bug?

*** This bug has been confirmed by popular vote. ***

Please note that the kioclient app that comes with kdebluetooth still works, e.g. 

kioclient -U ls bluetooth:/
kioclient -U ls sdp://[somedevice]/

I'm not sure, but perhaps this indicates that the problem (additionally) lies elsewhere.

Created attachment 15503 [details]
Fix for kdebluetooth, to be usable with current 3.5 branch.

The problem is caused by the fact that the kioslave calling mechanisms have evolved, while kdebluetooth doesn't reflect this. I'm appending a patch, which I've created with a great help of David and Thiago. It works on my system, but it's still not ideal. There are still at least 2 potential problems:
1) Advanced view modes (i.e. treeview) are probably broken
2) Syntactically wrong URLs are used by sdp://, which works now, but will break in KDE4.
Please test the patch.

Sorry for my ignorance, but... Pavel's patch should be applied to the source, not to the binaries, right? This should be the reason why I can't find on my kubuntu machine the .cpp files to be patched...

Confirming Pavel's patch works on kdebluetooth-svn, FC4 KDE 3.5.2(-1.2.fc4.kde). Good job!

Now for obex:/ ... ;-)

Any chance of a patch against 1.0_beta1? The current one didn't apply cleanly.

Created attachment 15516 [details]
Patch against 1.0_beta1

I have attached a patch which applies the changes against kdebluetooth 1.0_beta1. It appears to work quite well.

The listing contains information which is not provided by kio_bluetooth:
+listing=Name,Type,Size,Date,AccessDate,Access,Owner,Group,Link

kio_bluetooth only provides Name and Typ.
Doesn't make it more sense to change this to?:

+listing=Name,Type

But there is still a new/old problem:
When i try to open a service which is unsupported by KDE, for example sco or syncml, and i press "Open with" to make use of a command line application or somthing else there appears an error:
Could not stat sdp://[MY:MA:CA:DD:RE:SS]/params?name=MYPHONE&rfcommchannel=11.
Unkown device

New bug?

listing if btsdp.protocol should be also only Name,Type so only supported information will be shown in "detailed list view" mode.

I confirm (perhaps this confirmation was not necessary?) that the bug is still here, on Kubuntu. I updated until yesterday. Anyone knows wheter the patch is going to be communicated also to the main linux distribution managers?
thanks

I'd imagine you'd want to file a bug report with your distribution of choice, as I have done with Gentoo.

Version 0.99+1.0beta1-8 in debian unstable now works. Great!!!!!

I upgraded via TGZ on Slackware, same bug. How could new "bugfixed" KDE broke this functionality? very very unusable.

I haven't tested this thoroughly, but I had the same problem in debian testing and it seems solved in unstable,kdebluetooth version 0.99+1.0beta1-10 as #21 says.

in 3.5.2 (SuSE 10.1) the problem is still there - obviously because of kdebluetooth-0.0.svn20060413-7

in KDE SVN SuSE 10.1 x86_64 extragear/pim/kdebluetooth is not selected for compilation . do not know why yet.

I can confirm the problem in SuSE 10.1, KDE 3.5.3 and kdebluetooth-0.0.svn20060413-16.1

I reported this bug to Novell as well: https://bugzilla.novell.com/show_bug.cgi?id=186564

SVN commit 553447 by rdieter:

BUG: 123607
fix 'konqueror bluetooth:/ returns error "Bad URL"'. using supplied patch, thanks.


 M  +1 -0      kdebluetooth-common/mimetypes/computer-device-class.desktop  
 M  +1 -0      kdebluetooth-common/mimetypes/misc-device-class.desktop  
 M  +1 -0      kdebluetooth-common/mimetypes/phone-device-class.desktop  
 M  +1 -0      kioslave/bluetooth/bluetooth.protocol  
 M  +3 -1      kioslave/bluetooth/kiobluetooth.cpp  
 M  +12 -2     kioslave/sdp/btsdp.cpp  
 M  +1 -0      kioslave/sdp/btsdp.protocol  


--- trunk/extragear/pim/kdebluetooth/kdebluetooth-common/mimetypes/computer-device-class.desktop #553446:553447
@@ -3,6 +3,7 @@
 Type=MimeType
 MimeType=bluetooth/computer-device-class
 Icon=konsole
+X-KDE-IsAlso=inode/directory
 Comment=Computer/PDA Bluetooth Device
 Comment[bg]=Компютърно/PDA Bluetooth устройство
 Comment[bs]=Računar/PDA Bluetooth uređaj
--- trunk/extragear/pim/kdebluetooth/kdebluetooth-common/mimetypes/misc-device-class.desktop #553446:553447
@@ -3,6 +3,7 @@
 Type=MimeType
 MimeType=bluetooth/misc-device-class
 Icon=kdebluetooth
+X-KDE-IsAlso=inode/directory
 Comment=Miscellaneous Bluetooth Device
 Comment[bg]=Разни Bluetooth устройства
 Comment[ca]=Dispositiu Bluetooth divers
--- trunk/extragear/pim/kdebluetooth/kdebluetooth-common/mimetypes/phone-device-class.desktop #553446:553447
@@ -3,6 +3,7 @@
 Type=MimeType
 MimeType=bluetooth/phone-device-class
 Icon=kaddressbook
+X-KDE-IsAlso=inode/directory
 Comment=Phone Bluetooth Device
 Comment[bg]=Телефонно Bluetooth устройство
 Comment[ca]=Dispositiu Bluetooth telefònic
--- trunk/extragear/pim/kdebluetooth/kioslave/bluetooth/bluetooth.protocol #553446:553447
@@ -4,6 +4,7 @@
 input=none
 output=filesystem
 reading=true
+listing=Name,Type
 Icon=kdebluetooth
 Description=Bluetooth inquiry protocol
 Description[bg]=Протокол за заявка към Bluetooth
--- trunk/extragear/pim/kdebluetooth/kioslave/bluetooth/kiobluetooth.cpp #553446:553447
@@ -64,6 +64,7 @@
     if (url.hasHost() == false && path == "/")
     {
         createDirEntry(entry, "Bluetooth neighborhood");
+        statEntry(entry);
         finished();
     }
     else {
@@ -284,7 +285,8 @@
 
     addAtom(entry, UDS_MIME_TYPE, mimeType);
     addAtom(entry, UDS_FILE_TYPE, S_IFDIR);
-    addAtom(entry, UDS_GUESSED_MIME_TYPE, "inode/folder");
+    // No more necessary
+    // addAtom(entry, UDS_GUESSED_MIME_TYPE, "inode/folder");
 
     return true;
 }
--- trunk/extragear/pim/kdebluetooth/kioslave/sdp/btsdp.cpp #553446:553447
@@ -131,12 +131,22 @@
         if (path == "/")
         {
             createDirEntry(entry, "Bluetooth neighborhood");
+            statEntry(entry);
             finished();
         }
         else
         {
-            error(KIO::ERR_SLAVE_DEFINED,
-                  i18n("Could not stat %1. Unknown device").arg(url.url()));
+            QRegExp reg = QRegExp("^/uuid-(0x[a-f,A-F,0-9:]+)/");
+            if (reg.search(path) >= 0) {
+                createDirEntry(entry, "More services");
+                statEntry(entry);
+                finished();
+            }
+            else {
+              error(KIO::ERR_SLAVE_DEFINED,
+                    i18n("Could not stat %1. Unknown device").arg(url.url()));
+            }
+
         }
     }
     else {
--- trunk/extragear/pim/kdebluetooth/kioslave/sdp/btsdp.protocol #553446:553447
@@ -5,6 +5,7 @@
 output=filesystem
 reading=true
 Icon=kdebluetooth
+listing=Name,Type
 Description=Bluetooth service discovery protocol
 Description[bg]=Протокол за откриване на Bluetooth услуги
 Description[ca]=Protocol per al descobriment de servei Bluetooth