How To Fix 00664 - Unknown host

00664 - Overview

• Message type: E = Error

• Message class: 00 -

• Message number: 664

• Message text: Unknown host

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 00664 - Unknown host ?

  The SAP error message "00664 Unknown host" typically indicates that the SAP system is unable to resolve the hostname of the server it is trying to connect to. This can occur in various scenarios, such as when trying to connect to a database, application server, or any other network resource.
  Causes:
  
  Incorrect Hostname: The hostname specified in the SAP configuration is incorrect or misspelled.
  DNS Issues: The Domain Name System (DNS) is unable to resolve the hostname to an IP address.
  Network Configuration: There may be network issues preventing the SAP system from reaching the host.
  Hosts File: The entry for the hostname may be missing or incorrect in the local hosts file.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the host.
  
  Solutions:
  
  Check Hostname: Verify that the hostname is correct in the SAP configuration. This includes checking the instance profile and any connection settings.
  DNS Configuration: Ensure that the DNS server is