SirNippil, I want to sincerely thank you with all of my heart because, you sir have fixed my day z (signature check issue) 100%. I can now play, and I have been for 3 and 1/2 hours with no issues. I too have gone through countless re-installs and other "fixes" to no avail. I will recommend this MTU fix to everyone I know with this issue. Thanks again for this quick, easy fix for my long and complicated problem. Mrvideo