Return
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Title
"0x800706ba: RPC Server is Unavailable" When Adding or Validating an OS Connection -
Description
When attempting to add or validate an Operating System (OS) connection, the following error may appear:
Could not connect to 192.168.0.1 or MYSERVER. RPC Server Unavailable (0x800706ba). The computer did not respond at all. This could be due to firewall blocking communication or WMI being disabled. -
Cause
Cause ID Description 1 (Most common) Windows Firewall or network firewall is blocking the dynamic RPC response from the target host. RPC uses TCP ports 135/445 initially, then random dynamic ports (>1024) for return communication. The failure often occurs on the return channel. 2 RPC or Remote Registry service is not running on the monitored host. 3 NAT (Network Address Translation) device interfering with DCOM communication. RPC connections generally do not work reliably over NAT. 4 System time between the Foglight Agent Manager (FglAM) and monitored host is not synchronized. 5 IPSec policies on the monitored host restrict access to specific IPs, blocking the FglAM host connection. -
Resolution
Solution ID Action 1 Enable Required Ports and Configure Firewall Rules (Recommended)
Allow TCP ports on monitored host:
• 135 (DCE/RPC Locator Service)
• 139 (NetBIOS Session Service)
• 445 (Windows Shares)
• 49152–65535 (Dynamic RPC Ports)
Enable firewall rules:netsh advfirewall firewall set rule group="Windows Management Instrumentation (WMI)" new enable=yes netsh advfirewall firewall set rule group="remote administration" new enable=yes
Optional: Configure a static port for DCOM/WMI connections.
Refer to KB 4289831 for details.2 Start Required Services on Target Host
Ensure the following services are running:
• Remote Procedure Call (RPC)
• Remote Registry
See Microsoft KB 154596 for details.3 Avoid NAT Devices
Position the FglAM server on the same network segment as the monitored host to avoid RPC issues caused by NAT.4 Synchronize System Clocks
Verify system time on FglAM server matches that of the monitored host.5 Revise IPSec Settings
Confirm IPSec policies on monitored host allow traffic from the FglAM host IP address.Additional Information
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Additional Information
Microsoft Technet "Troubleshooting The RPC Server is available"
http://social.technet.microsoft.com/wiki/contents/articles/4494.troubleshooting-the-rpc-server-is-unavailable.aspxHere is some information on the ports for the WMI from our Agent Manager installation guide that should provide further information on the ports required for WMI.
https://support.quest.com/technical-documents/foglight-agent-manager/6.0.0/foglight-agent-manager-guide/17#TOPIC-1638144