A quick note: How to scrollback in GNU Screen. In GNU Screen press Ctrl + a + [ to enter Copy Mode, then scroll up/down using keys j or k. Below are some other navigation keys:
h - Move the cursor left by one character j - Move the cursor down by one line k - Move the cursor up by one line l - Move the cursor right by one character 0 - Move to the beginning of the current line $ - Move to the end of the current line. G - Moves to the specified line (defaults to the end of the buffer). C-u - Scrolls a half page up. C-b - Scrolls a full page up. C-d - Scrolls a half page down. C-f - Scrolls the full page down.
You can also use activate copy mode of GNU Screen by Ctrl + Esc that might be more useful than Ctrl + a + [ shortcut.
Warning: As this issue is common, this post is coming from the Network, thanks!