I get this error when just cloning the mozilla source code repository, can you tell me what the problem is?

or
When cloning via TortoiseHg GUI I get the following error
- The remote host forcibly terminated the existing connection code 255

I get this error when just cloning the mozilla source code repository, can you tell me what the problem is?

or
When cloning via TortoiseHg GUI I get the following error

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