Looks like you have a bad filter.  Odd that those errors say:
#mine is always last in the list

Did you change a filter?  Post it.

this seems to happen every time someone tried to connect, before it shows the 
warning and then the ban.

Connect how?  IMAP, POP3, SMTP?

Bill


On 8/10/2017 2:31 PM, Steve Rowe via Fail2ban-users wrote:

Hi all, I’m hoping someone can answer the following error query I have.

I am running Fail2Ban v0.9.6 on CentOS Linux release 7.3.1611 (Core)

In the fail2ban log I see a lot (depending on the connection attempts in a 
second or two). Error 2 as below.

2017-08-10 18:10:07,000 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for #mine: [Errno -2] Name or service not known

2017-08-10 18:10:07,044 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for is: [Errno -2] Name or service not known

2017-08-10 18:10:07,108 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for always: [Errno -2] Name or service not known

2017-08-10 18:10:07,132 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for last: [Errno -2] Name or service not known

2017-08-10 18:10:07,156 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for in: [Errno -2] Name or service not known

2017-08-10 18:10:07,199 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for the: [Errno -2] Name or service not known

2017-08-10 18:10:07,218 fail2ban.filter [22850]: WARNING Unable to find a corresponding IP address for list: [Errno -2] Name or service not known

2017-08-10 18:10:07,218 fail2ban.filter         [22850]: INFO [sasl-iptables] 
Found 213.141.81.24

2017-08-10 18:10:07,645 fail2ban.actions        [22850]: NOTICE [sasl-iptables] 
Ban 213.141.81.24

this seems to happen every time someone tried to connect, before it shows the 
warning and then the ban.

Any ideas or suggestions appreciated.



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