Description of problem:
seems to be a problem where if the range of ports used for NX (ssh proxying) 30000:40000 are blocked, then the X2go client program has this crash

Version-Release number of selected component:
x2goclient-4.0.3.1-1.fc20

Additional info:
reporter:       libreport-2.2.3
backtrace_rating: 4
cmdline:        x2goclient
crash_function: SshMasterConnection::executeCommand
executable:     /usr/bin/x2goclient
kernel:         3.17.8-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 SshMasterConnection::executeCommand at ../sshmasterconnection.cpp:243
 #1 ONMainWindow::resumeSession at ../onmainwindow.cpp:4157
 #2 ONMainWindow::slotProxyFinished at ../onmainwindow.cpp:5619
 #3 ONMainWindow::qt_static_metacall at moc_onmainwindow.cpp:384
 #4 QMetaObject::activate at kernel/qobject.cpp:3567
 #5 QProcess::finished at .moc/release-shared/moc_qprocess.cpp:155
 #6 QProcessPrivate::_q_processDied at io/qprocess.cpp:1089
 #7 QProcess::qt_static_metacall at .moc/release-shared/moc_qprocess.cpp:91
 #8 QMetaObject::activate at kernel/qobject.cpp:3567
 #9 QSocketNotifier::activated at .moc/release-shared/moc_qsocketnotifier.cpp:102