I run a major media upload/download site and I noticed these:
Is this serious or background noise due to the big file sizes and is there any tweaks I can add to /etc/sysctl.conf to improve and prevent issues?
[8822139.804040] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8822140.944041] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8822143.224052] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8822147.776079] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8822156.896049] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8822175.136049] TCP: Peer 177.47.116.196:53829/80 unexpectedly shrunk window 2513116350:2513136117 (repaired)
[8900596.808027] TCP: Peer 101.109.227.138:56284/80 unexpectedly shrunk window 1388148754:1388196670 (repaired)
[8900598.444020] TCP: Peer 101.109.227.138:56284/80 unexpectedly shrunk window 1388148754:1388196670 (repaired)
[8914737.204037] TCP: Peer 2.238.243.60:63238/80 unexpectedly shrunk window 2810470657:2810491097 (repaired)
[8914738.004046] TCP: Peer 2.238.243.60:63238/80 unexpectedly shrunk window 2810470657:2810491097 (repaired)
[8971335.364038] TCP: Peer 93.41.29.194:52424/80 unexpectedly shrunk window 4213166081:4213167541 (repaired)
[8971336.188080] TCP: Peer 93.41.29.194:52424/80 unexpectedly shrunk window 4213166081:4213167541 (repaired)
[8971337.840029] TCP: Peer 93.41.29.194:52424/80 unexpectedly shrunk window 4213166081:4213167541 (repaired)
[8973358.684040] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51484237:51532153 (repaired)
[8973361.684045] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8973363.248026] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8973366.376022] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8973372.640024] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8973385.152034] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8973410.144024] TCP: Peer 101.109.225.96:50436/80 unexpectedly shrunk window 51625081:51670093 (repaired)
[8984154.940026] TCP: Peer 94.21.56.15:54897/80 unexpectedly shrunk window 2953312133:2953554053 (repaired)
Welcome to the Internet. It's perfectly normal for other machines to break the rules when they're talking to you. You can't fix the world, nor do you need to.