How To Fix GW497 - Unable to determine host address; error with NiHostToAddr

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 497

• Message text: Unable to determine host address; error with NiHostToAddr

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.

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message GW497 - Unable to determine host address; error with NiHostToAddr ?

  The SAP error message GW497: Unable to determine host address; error with NiHostToAddr typically indicates that the SAP system is having trouble resolving a hostname to an IP address. This can occur in various scenarios, such as when trying to connect to a database, an application server, or any other network resource.
  Causes:
  
  DNS Issues: The hostname you are trying to connect to may not be resolvable due to DNS misconfiguration or issues with the DNS server.
  Incorrect Hostname: The hostname specified in the configuration might 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 /etc/hosts file (on Unix/Linux) or C:\Windows\System32\drivers\etc\hosts file (on Windows) may not contain the necessary entries for the hostname.
  Firewall or Security Settings: Firewalls or security settings may be blocking access to the hostname or the DNS server.
  
  Solutions:
  
  Check Hostname: Verify that the hostname you are trying to connect to is correct. Ensure there are no typos.
  DNS Configuration: 
  
  Check the DNS settings on the server where SAP is running. Ensure that the DNS server is reachable and properly configured.
  You can use commands like nslookup or ping to test if the hostname resolves correctly.
  
  
  Update Hosts File: If DNS resolution is not working, consider adding the hostname and its corresponding IP address to the hosts file.
  Network Connectivity: Ensure that there are no network issues preventing access to the DNS server or the target host. Check for any network outages or misconfigurations.
  Firewall Settings: Review firewall settings to ensure that they are not blocking DNS queries or access to the target host.
  SAP Profile Parameters: Check the SAP profile parameters related to network settings. Ensure that they are correctly configured.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error. SAP frequently releases notes that address known issues.
  Logs: Review the SAP system logs (transaction SM21) and the developer traces (transaction ST22) for additional context or related errors.
  Network Tools: Utilize network diagnostic tools to trace the route to the hostname and identify where the resolution is failing.
  
  If the issue persists after trying the above solutions, consider reaching out to your network administrator or SAP support for further assistance.