What is this?

This knowledgebase contains questions and answers about PRTG Network Monitor and network monitoring in general.

Learn more

PRTG Network Monitor

Intuitive to Use. Easy to manage.
More than 500,000 users rely on Paessler PRTG every day. Find out how you can reduce cost, increase QoS and ease planning, as well.

Free Download

Top Tags

View all Tags

LOGIN Failed into IMAP sensors



We monitorize a lot of ARCServe D2D status (copy, fusion,etc) with one mailbox where all the mails goes to.

In past weeks, the sensor worked great, but right now, all of them are down with error "login failed". This is very weird, 'cause the mailbox does not changed in anyway. I've changed the mailbox's password. I've reconfigured the sensor's credentials, the sensor was fine for a few seconds and then has fell again. Very strange.

And new credentials seems to be not valid for any of them.

Any ideas???

error failed-logins imap-sensor

Created on Jan 28, 2014 11:00:04 AM

2 Replies




thank you very much for your KB-Post. Could you please upload some screenshots showing the exact error messages on the sensor (from the "Overview"-Tab)? If the sensor is not in error-state right now, you can also check the "Log"-Tab of the sensor, to view previous error-messages.

best regards.

Created on Jan 28, 2014 4:17:57 PM by  Torsten Lindner [Paessler Support]



Hi there,

Meanwhile the post was authorized, I found the solution. It was a trouble with mailbox/user deactivation in Exchange/AD.

1-The sensors was down, all of them. 2-Password account was modified, so we need to reset on AD 3-New password was tested in one sensor. That was ok. 4-All other sensors wasn't stopped, so this caused a new account blocking, 'cause AD and Exchange doesn't admit large amount of login attempts (with wrong password). 5-New password. Stop all sensors. Change password one-by-one.

Thanks and sorry for inconveniences.

Created on Jan 29, 2014 7:48:17 AM

Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.