Amdump fails to backup large DLEs

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Issue
amdump fails to backup large DLEs. It fails with "Connection reset by peer" error

message

Configuration
iptables (firewall packet filter) is configured on the Amanda clien
Cause
iptables was breaking the TCP connections (set up by Amanda client and server for

backing up the data) because it was idle. During backup of large DLEs (~10GB data), the connections will remain idle for a long time.

Solution
Increase tcp keepalive probes
echo 90 > /proc/sys/net/ipv4/tcp_keepalive_time