I get the following when I check

[root@server1~]# syslog-ng

 WARNING: the match() filter without the use of the value() option is deprecated and hinders performance, please update your configuration;
The kernel refused to set the receive buffer (SO_RCVBUF) to the requested size, you probably need to adjust buffer related kernel parameters; so_rcvbuf='536870912', so_rcvbuf_set='425984'

[root@ server1~]# sysctl -a |grep rmem_max
net.core.rmem_max = 212992
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.eth0.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
[root@ server1 ~]# sysctl -a |grep vbuf
net.ipv4.tcp_moderate_rcvbuf = 1
sysctl: reading key "net.ipv6.conf.all.stable_secret"
sysctl: reading key "net.ipv6.conf.default.stable_secret"
sysctl: reading key "net.ipv6.conf.eth0.stable_secret"
sysctl: reading key "net.ipv6.conf.lo.stable_secret"
net.sctp.rcvbuf_policy = 0
[root@ server1~ ]# cat /proc/sys/net/ipv4/tcp_rmem
4096    87380   6291456
[root@ server1~ ]# cat /proc/sys/net/core/rmem_default
212992
[root@ server1~ ]# cat /proc/sys/net/core/rmem_max
212992
[root@ server1~ ]# grep . /proc/sys/net/ipv4/tcp*mem
/proc/sys/net/ipv4/tcp_mem:173202       230936  346404
/proc/sys/net/ipv4/tcp_rmem:4096        87380   6291456
/proc/sys/net/ipv4/tcp_wmem:4096        16384   4194304
[root@ server1~ hisotry]#

I attempted to make the changes on the server.

What can I do to resolve this issue?