Invalid access to memory

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7.2

Error message:
Invalid access to memory.

Stack trace:
(005DD178) _ne_ssl_trust_default_ca
(007E0E6E) C4799_3
(007E2ED6) ____ExceptionHandler
(007DFE50) __ExceptionHandler
(0003F23E) ntdll.dll.ZwWow64CallFunction64
(0003F9BA) ntdll.dll.KiUserExceptionDispatcher
(007272B4) TWebDAVFileSystem::NeonOpen
(00726B8B) TWebDAVFileSystem::NeonClientOpenSessionInternal
(007269FF) TWebDAVFileSystem::OpenUrl
(007266CE) TWebDAVFileSystem::Open
(00709CCE) TTerminal::Open
(00672817) TTerminalThread::TerminalOpenEvent
(0066D7F8) TSignalThread::Execute
(000821F7) Userinterface::C21_0
(00016C02) KERNEL32.DLL.BaseThreadInitThunk
(0005A54D) ntdll.dll
(0005A515) ntdll.dll
Connection failed.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

<Try to describe precise steps that lead to the problem (where do you click, what keys do you press, what do you see, etc.)>
<If relevant, consider attaching a session log file or a screenshot)>

WinSCP 5.7.2

Error message:
Zugriffsverletzung - ungültiger Zugriff auf den Speicher.

Stack trace:
(005DD178) _ne_ssl_trust_default_ca
(007E0E6E) C4799_3
(007E2ED6) ____ExceptionHandler
(007DFE50) __ExceptionHandler
(0005A60A) ntdll.dll
(0000F12E) ntdll.dll.KiUserExceptionDispatcher
(007272B4) TWebDAVFileSystem::NeonOpen
(00726B8B) TWebDAVFileSystem::NeonClientOpenSessionInternal
(007269FF) TWebDAVFileSystem::OpenUrl
(007266CE) TWebDAVFileSystem::Open
(0070A10B) TTerminal::Open
(00672817) TTerminalThread::TerminalOpenEvent
(0066D7F8) TSignalThread::Execute
(000821F7) Userinterface::C21_0
(00012368) kernel32.dll.BaseThreadInitThunk
(000382B0) ntdll.dll
(00038280) ntdll.dll
Verbindung fehlgeschlagen.

Thanks for your report.
I have sent you an email with a debug version of WinSCP to address you have used to register on this forum.

This bug has been added to the tracker:
https://winscp.net/tracker/1323

Tring to connect to S3 compatible storage, but without security (an internal MinIO server that does not use SSL).

Changed the setting Ftps=0 in the INI file (default was Ftps=1).

WinSCP 5.19.2

Error message:
Invalid access to memory.

Stack trace:
(00BF2F90) _ne_ssl_trust_default_ca
(00FBC612) C5294_3
(00FBE67A) ____ExceptionHandler
(00FBB434) __ExceptionHandler
(00088F9F) ntdll.dll
(000741F1) ntdll.dll.KiUserExceptionDispatcher
(0057766B) C1383_0
(00577D67) C1383_0
(00578119) request_perform
(00578D08) _S3_list_service
(00D06E88) TS3FileSystem::ReadDirectoryInternal
(00D05E81) TS3FileSystem::TryOpenDirectory
(00D02C56) TS3FileSystem::Open
(00DBA600) TTerminal::Open
(00CEFA2F) TTerminalThread::TerminalOpenEvent
(00CEA89C) TSignalThread::Execute
(000C16E3) Userinterface::C20_0
(00015357) KERNEL32.DLL.BaseThreadInitThunk
(000677A2) ntdll.dll.RtlGetAppContainerNamedObjectPath
(0006776F) ntdll.dll.RtlGetAppContainerNamedObjectPath
Connection failed.

I know how to reproduce the problem or the problem happens frequently enough. I wish to be contacted by the WinSCP team to help resolving the problem.

@rahim.nizamani: Thanks for your report.
WinSCP does not support S3 without encryption.
See https://winscp.net/tracker/1995
You can vote for it there.