LDN - Luminis Developer Network

Hi.
From time to time we get the message:

CPIP Notification: loginuser request failed for comexp
If you need assistance, contact your system administrator.

The message appears when the user clics on the e-mail Icon or in the e-mail channel.

This error goes away just by stopping and restarting the e-mail server (we're using the sun mail server that comes with luminis).

I was wondering if someone has a correction or a workaround for this.

Thanks in advance