Version:            (using KDE KDE 3.4.2)
Installed from:    Gentoo Packages
Compiler:          gcc 3.3.5 
OS:                Linux

I have a local cupsd running, which has a remote cups printer configured. kdeprint is configured to use the local cups server. However, if the network of the remote printer is unreachable, kdeprint hangs. I left it running for about 30min, no timeout! Print dialogs work, until I e.g. try to create a preview of a printing using the unreachable printer.
I found several similar bugs, but all were pre-qt-3.3 problems or have been fixed in kde 3.3 already. 

gdb, kcmshell printmgr, ctrl-c, bt:
(gdb) backtrace
#0  0xffffe410 in __kernel_vsyscall ()
#1  0x488bb801 in connect () from /lib/tls/libpthread.so.0
#2  0xb7c800fc in httpReconnect () from /usr/lib/libcups.so.2
#3  0xb7c7ff0e in httpConnectEncrypt () from /usr/lib/libcups.so.2
#4  0xb7c8ee42 in cupsGetPPD2 () from /usr/lib/libcups.so.2
#5  0xb7c8e964 in cupsGetPPD () from /usr/lib/libcups.so.2
#6  0xb7cc3633 in downloadDriver () from /usr/kde/3.4/lib/kde3/kdeprint_cups.so
#7  0xb7cbd694 in KMCupsManager::completePrinter ()
   from /usr/kde/3.4/lib/kde3/kdeprint_cups.so
#8  0x499df134 in KMMainView::slotPrinterSelected ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#9  0x499e2536 in KMMainView::qt_invoke ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#10 0x48ea392c in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#11 0x48ea3dcd in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#12 0x499e38a4 in KMPrinterView::printerSelected ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#13 0x499e3ac9 in KMPrinterView::qt_emit ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#14 0x48ea38db in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#15 0x48ea3dcd in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#16 0x499d8485 in KMIconView::printerSelected ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
---Type <return> to continue, or q <return> to quit---
#17 0x499d805d in KMIconView::slotSelectionChanged ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#18 0x499d852b in KMIconView::qt_invoke ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#19 0x48ea392c in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#20 0x48ea3754 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#21 0x4921144b in QIconView::selectionChanged ()
   from /usr/qt/3/lib/libqt-mt.so.3
#22 0x49062dc6 in QIconViewItem::setSelected ()
   from /usr/qt/3/lib/libqt-mt.so.3
#23 0x4906785e in QIconView::setSelected () from /usr/qt/3/lib/libqt-mt.so.3
#24 0x499d81cc in KMIconView::setPrinter ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#25 0x499d8214 in KMIconView::setPrinter ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#26 0x499e3545 in KMPrinterView::setPrinter ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#27 0x499deac0 in KMMainView::slotTimer ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#28 0x499e2403 in KMMainView::qt_invoke ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#29 0x48ea38a6 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#30 0x48ea3754 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
---Type <return> to continue, or q <return> to quit---
#31 0x491e81eb in QTimer::timeout () from /usr/qt/3/lib/libqt-mt.so.3
#32 0x499f5fb8 in KMTimer::releaseTimer ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#33 0x499f5f57 in KMTimer::release ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#34 0x499e1d58 in KMMainView::slotUpdatePossible ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#35 0x499e25ca in KMMainView::qt_invoke ()
   from /usr/kde/3.4/lib/libkdeprint_management.so.4
#36 0x48ea392c in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#37 0x48ea3f60 in QObject::activate_signal_bool ()
   from /usr/qt/3/lib/libqt-mt.so.3
#38 0x4a0a092a in KMManager::updatePossible ()
   from /usr/kde/3.4/lib/libkdeprint.so.4
#39 0x4a0a07a0 in KMManager::setUpdatePossible ()
   from /usr/kde/3.4/lib/libkdeprint.so.4
#40 0xb7cc2eb2 in KMCupsManager::slotConnectionSuccess ()
   from /usr/kde/3.4/lib/kde3/kdeprint_cups.so
#41 0xb7cc3858 in KMCupsManager::qt_invoke ()
   from /usr/kde/3.4/lib/kde3/kdeprint_cups.so
#42 0x48ea392c in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#43 0x48ea3754 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#44 0x492159ac in QSocket::connected () from /usr/qt/3/lib/libqt-mt.so.3
---Type <return> to continue, or q <return> to quit---
#45 0x490a121c in QSocket::tryConnection () from /usr/qt/3/lib/libqt-mt.so.3
#46 0x490a118c in QSocket::sn_write () from /usr/qt/3/lib/libqt-mt.so.3
#47 0x49215b9b in QSocket::qt_invoke () from /usr/qt/3/lib/libqt-mt.so.3
#48 0x48ea392c in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#49 0x48ea3a8d in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#50 0x491e6e22 in QSocketNotifier::activated ()
   from /usr/qt/3/lib/libqt-mt.so.3
#51 0x48ec0220 in QSocketNotifier::event () from /usr/qt/3/lib/libqt-mt.so.3
#52 0x48e46eef in QApplication::internalNotify ()
   from /usr/qt/3/lib/libqt-mt.so.3
#53 0x48e46225 in QApplication::notify () from /usr/qt/3/lib/libqt-mt.so.3
#54 0x494bff15 in KApplication::notify () from /usr/kde/3.4/lib/libkdecore.so.4
#55 0x48e3663a in QEventLoop::activateSocketNotifiers ()
   from /usr/qt/3/lib/libqt-mt.so.3
#56 0x48df025d in QEventLoop::processEvents () from /usr/qt/3/lib/libqt-mt.so.3
#57 0x48e59398 in QEventLoop::enterLoop () from /usr/qt/3/lib/libqt-mt.so.3
#58 0x48e471a1 in QApplication::enter_loop () from /usr/qt/3/lib/libqt-mt.so.3
#59 0x4902ec40 in QDialog::exec () from /usr/qt/3/lib/libqt-mt.so.3
#60 0x48aee4a5 in kdemain () from /usr/kde/3.4/lib/libkdeinit_kcmshell.so
#61 0x0804872b in ?? ()
#62 0x00000002 in ?? ()
#63 0xbfb6f114 in ?? ()
#64 0xbfb6f0e8 in ?? ()
---Type <return> to continue, or q <return> to quit---
#65 0x4868f0d2 in __libc_start_main () from /lib/tls/libc.so.6
#66 0x4868f0d2 in __libc_start_main () from /lib/tls/libc.so.6
#67 0x08048661 in ?? ()

QT version: 3.3.4