I'm having the same issue, do you see any thing wrong with the config.xml file? 
<?xml version="1.0" encoding="UTF-8" standalone="yes"?> 
<config    xmlns="http://www.pulseway.com/linuxconfig"> 
  <Account Username="**********************" Password="*********************" UseCustomServer="false" CustomServerAddress="" /> 
  <ComputerInformation Name="Ubuntu" Group="Default" /> 
  <AllowedCommands> 
    <Restart Allowed="true" /> 
    <ShutDown Allowed="true" /> 
    <PowerOff Allowed="true" /> 
    <Suspend Allowed="true" /> 
    <Hibernate Allowed="true" /> 
  </AllowedCommands> 
  <Notifications> 
    <WhenOffline Enabled="false" /> 
    <OnOnline Enabled="false" /> 
    <OnShutdown Enabled="false" /> 
    <MemoryLow Percentage="10" Enabled="false" /> 
    <HighCpuUsage Percentage="90" Minutes="1" Enabled="false" /> 
    <LowCpuUsage Percentage="10" Minutes="1" Enabled="false" /> 
    <PortClosed Minutes="1" Enabled="false" /> 
    <LowHDDSpace Enabled="false"> 
      <Hdd Percentage="20" Path="/" Enabled="true" /> 
    </LowHDDSpace> 
    <IpChange Enabled="true"/> 
    <PingResponses Enabled="false"> 
        <PingResponse PriorityOnSlowResponse="1" PriorityOnNoResponse="0" Minutes="5" Miliseconds="50" Alias="Printer" Address="10.10.10.2" Position="1"/> 
    </PingResponses> 
  </Notifications> 
  <Network> 
    <Ping Server="" Enabled="false" /> 
    <MonitoredPorts> 
      <Port Type="TCP" Number="80" Name="80" Address="www.google.com"/> 
    </MonitoredPorts> 
    <NetworkInterfaces> 
      <Interface Name="eth0" /> 
    </NetworkInterfaces> 
    <WoWAN Port="9" Enabled="false"/> 
  </Network> 
  <MaintenanceMode>false</MaintenanceMode> 
  <Proxy Enabled=“false” Host="proxy.host" Port="8080" User="proxy.user" Password="proxy.password"/> 
</config>