http://192.168.1.3:5010/webapi/auth.cgi?api=SYNO.API.Auth&version=6&method=login&account=yahuw&passwd=8b45af5v%23Cbg
HTML URL Encoding Reference
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XML API Issue With Passwords Containing Special Characters - Knowledge Base - Palo Alto Networks
This article provides information about XML API issues with passwords containing special characters.
400 No such account or incorrect password - Recherche Google