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WinSCP version: 40.07 (Build 370)
"Timeout detected.
Copying files to remote side failed.
Opening ASCII mode data connection for file list

*I am unable to change MTU MSS on my router

Unable to upload files.


I am logging to my hosted web space using FTP and passive mode (I was unable to connect with SFTP).
That is what was recommened by my firewall.
Now I am able to log in and see the directories, but I am unable to upload anything.
I read this thread:
And it seemed relevant.
But I was unable to find where to change my MTU or MSS on my firewall.
What should I do?

Thank you.