App log warning (Exch 5.5)

The following warning message (Event ID: 1025, Source: MSExchangeIS Private )appears in the application log for our exchange server. We are running Exch 5.5 on an NT 4.0 platform.

“An error occurred.
Function name or description of problem: EcCreateLink
Error: 0x8004011b”

There don’t seem to be any issues with the server at the moment (other than this warning!), but I’m concerned that it may be symptomatic of a developing problem.

Anyone got any ideas what this message means? I have tried looking thro the MS Technet, but to no avail.

Thanks

Japes