Backup Exec system Recovery are not showing in the console ?

Symantec Backup Exec System Recovery Manager Ver: 7.0.1.21816

 
The installed agents are not showing in the manager console for a strange reason although:
 
1.       No Gateways is being used

2.       No Firewall / Router is in between

3.       Manager & Agents are in the same subnet

4.       Manager + agents licenses are installed
 
The clients should appear in the console after the restart, when I try to use the PublisherUI.exe tool to publish the agent into the console manually it keeps giving me "Failed" and in the Event Viewer I see this error:

Error E339197C: An error occurred while publishing. System.Net.WebException: The remote server returned an error: (502) Bad Gateway. The remote server returned an error: (502) Bad Gateway.

Details:

Source: Backup Exec System Recovery Management Control
 
Or
 
Error E339197C: An error occurred while publishing. System.Web.Services.Protocols.SoapException: org.xml.sax.SAXException: Bad types (class com.symantec.sea.middleware.data.SystemConfig1 -> class com.symantec.sea.middleware.data.SystemConfig) org.xml.sax.SAXException: Bad types (class com.symantec.sea.middleware.data.SystemConfig1 -> class com.symantec.sea.middleware.data.SystemConfig)

Details:

Source: Backup Exec System Recovery Management Control  

Please help me ASAP . thanks