How To Fix GW664 - Host name is not known

GW664 - Overview

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 664

• Message text: Host name is not known

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?

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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 GW664 - Host name is not known ?

  The SAP error message GW664 "Host name is not known" typically indicates that the SAP system is unable to resolve the hostname of a server or service that it is trying to connect to. This can occur in various scenarios, such as when trying to connect to an external system, a database, or even when accessing services within the SAP landscape.
  Causes:
  
  DNS Issues: The hostname may not be correctly configured in the Domain Name System (DNS), or the DNS server may be unreachable.
  Incorrect Hostname: The hostname specified in the configuration may be incorrect or misspelled.
  Network Configuration: There may be network issues preventing the SAP system from reaching the DNS server or the target host.
  Hosts File: The hostname may not be listed in the local hosts file (e.g., /etc/hosts on Unix/Linux or C:\Windows\System32\drivers\etc\hosts on Windows).
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the hostname.
  SAP Configuration: Incorrect settings