Applies To:
  • CitectSCADA 4.xx, 5.xx
Summary:
When you attempt to connect to a Windows NT Remote Access Service (RAS) server, you may receive the following error message:

Error Connecting to <RAS_server>. Dialling <Phone_number>.

Error 678: There is no answer.

You may receive this error message even though the RAS server is available.

 

Solution:
This problem can occur if the RAS server you are attempting to connect to is configured to use Dynamic Host Configuration Protocol (DHCP) to assign remote Transmission Control Protocol/Internet Protocol (TCP/IP) client addresses, and one of the following conditions exists:

(1) There is no DHCP server on the network.

(2) The DHCP server on the network is unavailable.

To resolve this problem, use one of the following methods:

Method 1 -

Verify that a DHCP server exists and is available on the network.

Method 2 -

Configure the RAS server so that TCP/IP is not used as a RAS protocol.

Method 3 -

Configure the RAS server to use a static address pool to assign remote TCP/IP client addresses.

Note - The range of IP addresses must be valid for the RAS server's subnet.

Microsoft has confirmed this to be a problem in Windows NT version 4.0.

 
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