[IUG] Extremely high numbers of log-in denials in logs, anyone?

["Taylor GS11 Amy S US" <tayloras at GRC dot USMCU dot EDU>]

Hello all,

 

I am a very new systems librarian and I have noticed that we have
occasional spikes of extremely high numbers of log-ins "denied" in the
logs.  We have several occasions of about 600 log-in attempts in the
morning and one occasion of thousands each hour all day.  They have
always been in our circ group.  

 

Other than those spikes, our log-in logs reflect what I
expect-occasional single denials when people forget to log out and the
other people get denied because the licenses are all in use. 

 

I opened a ticket with the help desk and they have advised me to adjust
my "Limit Network Access Table" which I did.  I am hoping that this will
log the IP address of the attempted log-ins and reveal the source.  

 

Have you ever seen numbers like this?  

 

Any ideas of causes or solutions? 

 

Thank you in advance for any thoughts or advice,

 

Amy 

tayloras at grc dot usmcu dot edu <mailto:anthonytm at grc dot usmcu dot edu> 

 

Amy Taylor

Systems Librarian

Library of the Marine Corps

Marine Corps University

Quantico, VA  22134

tayloras at grc dot usmcu dot edu <mailto:anthonytm at grc dot usmcu dot edu> 

(703) 432-4536

 


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