How Can I Get Debug Log for Guest User in a Salesforce Site?
Question
Normally, you can enable debug monitoring on a specific user to troubleshoot errors they encounter, such as the generic “Error Loading a Visualforce Page.” However, when debugging a Salesforce public site, how can you capture debug logs for the guest user?
Answer
You can enable debug logging for the guest user by going to Environments > Logs > Debug Log in Salesforce. Instead of entering a username, enter the Site Name as the user.
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For example, if your site is named “MySite,” enter MySite as the username. This method is not well-documented but provides the required debug logs.
Update on Debug Logging Changes
Previously, in Winter ’17, Salesforce required setting a browser cookie (debug_logs) to activate logging for guest users. This was introduced to prevent excessive logging due to shared guest user licenses, which could fill up logs and cause truncation. However, this change complicated debugging, especially for asynchronous processes and webhook integrations.
As of Spring ’18, Salesforce has removed the requirement for the debug_logs cookie. Public users no longer need to set a browser cookie to trigger debug logging. This applies to both Lightning Experience and Salesforce Classic, making debugging guest user activity much easier.
Summing Up
To capture debug logs for a Salesforce public site guest user, enter the Site Name instead of a username in Environments > Logs > Debug Log. The previous requirement to set a debug_logs cookie was removed in Spring ’18, making the process simpler. This change allows easier debugging of guest user activity without additional browser settings.
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