FAQ

Error on logon: "The RPC server is unavailable." (kb2423)

The information in this article applies to:

  • SwyxIt! all versions

[ Question | Answer | Further Informationen ]


Question

What does the error message "The RPC server is unavailable." mean ?

Answer

While SwyxIt! registers on the SwyxServer, the following error message pops up:

The RPC server is unavailable.

The error may show up only on the first Windows start on a day, further logons might work without problems.

There could be several reasons:

  • The SwyxServer is not reachable
  • The SwyxServer cannot access the SwyxIt! client
  • There is a local problem on the SwyxIt! client

Is the SwyxServer running and can it be used by other clients? Check if the SwyxServer shows up in the network environment and if it can be contacted via ping.

During Logon of SwyxIt! on a SwyxServer the Server will establish a DCOM connection to the SwyxIt! client. This connection will be used for delivering events like incoming calls or status notifications.

Does the network connection allow a bidirectional DCOM connection between client and server? Please check the settings of (personal) firewall, virus scan software (Hawk mode of McAfee) and VPN clients.

For this the operating system on the SwyxServer will do a name resolution of the client machine name (name of the SwyxIt! machine to IP Address). If this name resolution failes or returns a wrong address, the DCOM of the SwyxServer machine works with a wrong IP address. As a result the SwyxServer cannot access the registering client and the operating system returns the error message "The RPC server is unavailable.". 

Possible reasons are:

  • Two machines using the same IP address
  • Wrong configuration of DHCP or DNS. Short lease time for IP addresses may cause problems with DCOM. Please configure higher lease times of some days.
  • The IP address of the client machine has been changed but the server has cached the old address.
  • If a WINS server is running, this can happen as well. In the WINS server configuration lookup the respective SwyxIt! client PC. Mark it as tombstoned (delete), replicate it if applicable and delete the ARP cache.

Please verify if you can resolve the IP address of the client machine on the server. Try to configure a hosts file on the server.


Further Informationen

Further informations can be found in the Knowledgebase articles:

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