freefilesync+SFTP to achieve Data sharing on two computers

[uprabbit]

I built SFTP on computer1 & 2.
Computer 1 can connect to computer 2 by SFTP, but computer 2 can't connect to computer1
computer 1 is Dell inspiron 5488，win 10
computer 2 is HP ZHAN 99 Pro ,win10
How can I solve this problem?

[xCSxXenon]

https://support.microsoft.com/en-us/windows/file-sharing-over-a-network-in-windows-b58704b2-f53a-4b82-7bc1-80f9994725bf#:~:text=In%20the%20Find%20a%20setting,on%20file%20and%20printer%20sharing.

[uprabbit]

Thanks for yuor reply!
Do you mean that SFTP only work in a Local Area Network ? If yes, why computer 1 can connect to computer 2 ?
Looking forward to your reply

[therube]

Can 1 & 2 talk to each other outside of SFTP?
Can 1 & 2 talk to each other using a different SFTP program?