have the worker let any interested plugins know when the nam changes, and have the echonestplugin make use of that to set the appropriate nam for the thread

src/libtomahawk/infosystem/infoplugins/echonestplugin.cpp

@@ -33,6 +33,8 @@ EchoNestPlugin::EchoNestPlugin(InfoSystemWorker *parent)
     QSet< InfoType > supportedTypes;
     supportedTypes << Tomahawk::InfoSystem::InfoArtistBiography << Tomahawk::InfoSystem::InfoArtistFamiliarity << Tomahawk::InfoSystem::InfoArtistHotttness << Tomahawk::InfoSystem::InfoArtistTerms << Tomahawk::InfoSystem::InfoMiscTopTerms;
     parent->registerInfoTypes( this, supportedTypes, QSet< InfoType>() );
+
+    connect( parent, SIGNAL( namChanged() ), SLOT( namChangedSlot() ) );
 }
 
 EchoNestPlugin::~EchoNestPlugin()
@@ -40,6 +42,12 @@ EchoNestPlugin::~EchoNestPlugin()
     qDebug() << Q_FUNC_INFO;
 }
 
+void
+EchoNestPlugin::namChangedSlot()
+{
+    Echonest::Config::instance()->setNetworkAccessManager( m_infoSystemWorker->nam() );
+}
+
 void
 EchoNestPlugin::getInfo(const QString caller, const Tomahawk::InfoSystem::InfoType type, const QVariant input, const Tomahawk::InfoSystem::InfoCustomData customData)
 {

src/libtomahawk/infosystem/infoplugins/echonestplugin.h

@@ -62,6 +62,9 @@ protected slots:
         Q_UNUSED( customData );
     }
 
+public slots:
+    void namChangedSlot();
+
 private:
     void getSongProfile( const QString &caller, const QVariant &input, const InfoCustomData &customData, const QString &item = QString() );
     void getArtistBiography ( const QString &caller, const QVariant &input, const InfoCustomData &customData );

src/libtomahawk/infosystem/infosystemworker.cpp

@@ -177,6 +177,8 @@ InfoSystemWorker::newNam()
     newNam->setNetworkAccessible( oldNam->networkAccessible() );
     newNam->setProxy( oldNam->proxy() );
     m_nam = newNam;
+
+    emit namChanged();
 }
 
 

src/libtomahawk/infosystem/infosystemworker.h

@@ -49,6 +49,7 @@ public:
     
 signals:
     void info( QString target, Tomahawk::InfoSystem::InfoType, QVariant input, QVariant output, Tomahawk::InfoSystem::InfoCustomData customData );
+    void namChanged();
 
 public slots:
     void init();