1) Log File :Follow these steps to download logs,
1. Go to ADMINISTRATION -> Logging and Profiling.
2. Enter com.miniorange.oauth in package field under add new entry.
3. Select Debug in logging level and Click on add.
After these steps, perform single sign-on again to record logs. Then download support zip using these steps,
1. Go to ADMINISTRATION -> Troubleshooting and support tools.
2. Proceed to create support zip.
3. Click on Customize Zip, keep only Confluence application logs option selected and Save settings.
4. Click on Create zip and then Download zip.
2) SAML Tracer Log File : Click HERE to get steps to capture Tracer logs.