Resolution
Remove the trailing character from the recipient’s email address in the Address Book or in the To field.
example :
if ur sending to abc@example.com , you may be mistakenly using email address as abc@example.com. , a trailing dot can make this error to happen.
Allow incoming DNS request at port 53
Use following rules only if you are protecting dedicated DNS server.
SERVER_IP is IP address where BIND(named) is listing on port 53 for incoming DNS queries.
Please note that here I’m not allowing TCP protocol as I don’t have secondary DNS server to do zone transfer.
SERVER_IP=”123.108.230.184″
iptables -A INPUT -p udp -s 0/0 –sport 1024:65535 -d $SERVER_IP –dport 53 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp -s $SERVER_IP –sport 53 -d 0/0 –dport 1024:65535 -m state –state ESTABLISHED -j ACCEPT
iptables -A INPUT -p udp -s 0/0 –sport 53 -d $SERVER_IP –dport 53 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p udp -s $SERVER_IP –sport 53 -d 0/0 –dport 53 -m state –state ESTABLISHED -j ACCEPT
Hope it is easy to write iptables rule for a dns server
Hi ,
M back,
while installing the cpan modules for perl , i was getting the above error.
so following below solution worked out for it.
Use the cpan command-line tool. This can also be invoked via the command
perl -MCPAN -e shell
In the shell, type
install <packagename>
where <packagename> is something like Time::HiRes or Tk.
If it hangs for ages whilst trying to download files over FTP, or get errors like
LWP failed with code[400] message[FTP return code 150]
then try setting the FTP_PASSIVE environment variable before running cpan:
export FTP_PASSIVE=1
