What are the common causes of SAP connection error logs when trying to log in via SAP GUI?

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Grade: Education Subject: Support
What are the common causes of SAP connection error logs when trying to log in via SAP GUI?
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Common causes include incorrect SAP system details (hostname, system number, client), network connectivity issues (firewall blocking ports, VPN problems), SAP Gateway not running on the server, incorrect user credentials, or temporary SAP system unavailability. Corrupted SAP GUI installation or outdated patches can also contribute.