diff --git a/interface/ri_tk_cmd.py b/interface/ri_tk_cmd.py
index 98b781c..b1bcbf9 100644
--- a/interface/ri_tk_cmd.py
+++ b/interface/ri_tk_cmd.py
@@ -11,7 +11,8 @@ import copy
 import sys
 
 def serial_no_init():
-    display.var_dict['serial_no.number'].set(value=ri_data.SerialNumber.value)
+    if ri_data.SerialNumber.value.strip():
+        display.var_dict['serial_no.number'].set(value=ri_data.SerialNumber.value)
 
 def serial_no_quit():
     ri_data.SerialNumber.value = display.var_dict['serial_no.number'].get()
@@ -106,7 +107,8 @@ def mp_top_cancel():
 
 def network_init():
     ''' network initialize '''
-    display.var_dict['network_host_name'].    set(value=ri_data.Network.hostname)
+    if ri_data.Network.hostname.strip():
+        display.var_dict['network_host_name'].    set(value=ri_data.Network.hostname)
     ri_widget.Widget.dict['network_config_%s' %(ri_data.Network.configuration and ri_data.Network.configuration or 'static')].tk_widget.invoke()
     display.var_dict['network_domain_name'].  set(value=ri_data.Network.domain)
     display.var_dict['network_ip'].           set(value=ri_data.Network.ip)
diff --git a/xml/interface.xml b/xml/interface.xml
index bb6dad7..aae2d25 100644
--- a/xml/interface.xml
+++ b/xml/interface.xml
@@ -510,7 +510,7 @@ row 4 |                                                            |
       <widget type='Entry'>
 	<widget_attribute width='12' textvariable='network_host_name'/>
 	<grid_location row='0' column='1' sticky='W'/>
-	<variable name='network_host_name' type='StringVar'/>
+	<variable name='network_host_name' type='StringVar' value='localhost'/>
       </widget>
       
       <widget type='Label'>