Momentum 4 uses a large number of connections and is able to establish them quickly. This can overwhelm the operating system if special parameters are not used. These issues can be addressed by configuring the following lines in /etc/sysctl.conf:
fs.file-max = 9721865
net.core.netdev_max_backlog = 262144
net.core.optmem_max = 16777216
net.core.rmem_default = 67108864
net.core.rmem_max = 67108864
net.core.somaxconn = 8192
net.core.wmem_default = 67108864
net.core.wmem_max = 67108864
net.ipv4.tcp_base_mss = 1024
net.ipv4.tcp_fastopen = 1
net.ipv4.tcp_fin_timeout = 15
net.ipv4.tcp_max_syn_backlog = 65535
net.ipv4.tcp_max_tw_buckets = 2000000
net.ipv4.tcp_mem = 2885568 3847424 67108864
net.ipv4.tcp_mtu_probing = 1
net.ipv4.tcp_rmem = 4096 87380 67108864
net.ipv4.tcp_slow_start_after_idle = 0
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_wmem = 4096 65536 67108864
net.ipv4.udp_mem = 2885568 3847424 67108864
vm.max_map_count = 1048575
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