As is usual with mysterious "permission denied" errors, SELinux was the underlying cause. ...
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ID Status▲ Resolution Sev Product Comp Assignee▲ Reporter Summary
39036 NEW --- nor Sisyphus opennebu thatman ekorneechev Проблема с подключением по SPICE (из ВЕБ) к ВМ c Windows 10

File a new bug in the "opennebula-sunstone" component of the "Sisyphus" product