How to find IP of failed login attempts

[LarryMartell]

We have a self hosted JIRA install. On the admin page I noticed failed login attempts for a user who's left the company and had his account disabled:

Last Failed Login: Today 6:05 PM
Current Failed Login Count: 8
Total Failed Login Count: 11

How I can I see what IP these attempts came from? 

I read this question: https://answers.atlassian.com/questions/203776

And it said: 

You can view the information from the user sessions under the Security on the JIRA Administration page.

From there you are able to tell who is trying to establish the session and which session is still active. Failed session will have no session ID and no user, but it will track which ip is the request from.

When I went there I saw a session that had a session ID, and under user it said 'Not available' But there were no entries with no session ID. 

[Bhushan Nagaraj]

Hey Larry,

Go to JIRA_HOME/log/atlassian-jira-security.log and search for the text

The user '<insert username here>' has FAILED authentication

That should give you the IP address

[Jeff Turner]

A small perl script that extracts failing usernames and IPs from atlassian-jira-security.log:

cat $JIRA_HOME/atlassian-jira-security.log | perl -lane "print \$1 . ' ' . \$F[6] if (/The user '([^']+)' has FAILED authentication/)"
jsmith 10.1.1.104
jsmith 10.1.1.104
testsvc 10.1.1.102
...

To get the top failing username/IPs:

cat $JIRA_HOME/atlassian-jira-security.log | perl -lane "print \$1 . ' ' . \$F[6] if (/The user '([^']+)' has FAILED authentication/)"| sort | uniq -c | sort -nr | head

4546  jsmith 10.1.1.104
4332  seportal 10.1.1.99
148   testsvc 10.1.1.102
...