diff --git a/xCAT-UI/xCAT-UI.spec b/xCAT-UI/xCAT-UI.spec
index 9c3410c37..3902c594d 100644
--- a/xCAT-UI/xCAT-UI.spec
+++ b/xCAT-UI/xCAT-UI.spec
@@ -123,12 +123,23 @@ fi
 ihs_config_dir='/usr/IBM/HTTPServer/conf'
 if [ "$1" = 1 ] #initial install
 then
-    # Update the apache config
-    echo "Updating ibm http server configuration for xCAT..."
-    /bin/rm -f /usr/IBM/HTTPServer/conf/xcat-ui.conf
-    cp /usr/IBM/HTTPServer/conf/httpd.conf /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak
-    cat /opt/xcat/ui/etc/apache2/conf.d/xcat-ui.conf >> /usr/IBM/HTTPServer/conf/httpd.conf
-    /usr/IBM/HTTPServer/bin/apachectl restart
+    # check if IBM HTTP Server is installed into the default directory or not
+    if [ -f "/usr/IBM/HTTPServer/conf/httpd.conf" ]; then
+        # Update the apache config
+        echo "Updating ibm http server configuration for xCAT..."
+        /bin/rm -f /usr/IBM/HTTPServer/conf/xcat-ui.conf
+        cp /usr/IBM/HTTPServer/conf/httpd.conf /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak
+        cat /opt/xcat/ui/etc/apache2/conf.d/xcat-ui.conf >> /usr/IBM/HTTPServer/conf/httpd.conf
+        /usr/IBM/HTTPServer/bin/apachectl restart
+
+        # put the encrypted password in /etc/security/passwd to the xcat passwd db
+        CONT=`cat /etc/security/passwd`
+        %{prefix}/sbin/chtab key=xcat,username=root passwd.password=`echo $CONT |cut -d ' ' -f 4`
+    else
+	echo ""
+	echo "Error!"
+	echo "The IBM HTTP Server is not installed or not installed into the default directory(/usr/IBM/HTTPServer/)"
+    fi
 
     # put the encrypted password in /etc/security/passwd to the xcat passwd db
     CONT=`cat /etc/security/passwd`
@@ -181,8 +192,10 @@ fi
 %else   #for AIX
 # Remove links made during the post install script
 echo "Undoing IBM HTTP Server configuration for xCAT..."
-cp /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak /usr/IBM/HTTPServer/conf/httpd.conf
-rm -rf /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak
+if [ -f "/usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak" ];then
+    cp /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak /usr/IBM/HTTPServer/conf/httpd.conf
+    rm -rf /usr/IBM/HTTPServer/conf/httpd.conf.xcat.ui.bak
+fi
 /usr/IBM/HTTPServer/bin/apachectl restart
 %endif