Hello fellow Administrators,
Since yesterday we observe the following problem on our Domino Server (Mailserver):
The Server is not reachable by Lotus Notes Clients: Unable to find any path to… Server is not a known TCPIP host… and so on.
BUT
I’m still able to use the Microsoft Remote Desktop Connection (RDP Console mode) to connect to the server.
Being able to observe the Domino Server Console this way, I detected that the server is still running.
SMTP task is receiving and sending mails as normal.
Router Task is working as normal.
Replication was working as well… and so on.
DNS Resolution has been checked…
Even DWA is working. By the way DWA is being opened from SAP E Protal using LTPA Token from another Domino Server (DIIOP on that Server).
Further more I have a little Agent running on a second Domino Server wich tries to open the names.nsf on different servers. Wich was successfull during the time the problem occured.
So it looks like everything is working beside the connections from Lotus Notes Clients 
There are no error messages on the Domino Server.
Well, all this unavailability occured yesterday once and this morning twice.
Yesterday and today (once) we just deactivated the Network adapter within windows and enabled it again. The Domino server has not been restarted.
And it worked: users were able to connect to the Domino server again.
The last time the we didn’t do anything and the server was reachable again within a few minutes.
So my question to this community:
Did anybody see something similar or do you have any hints???
Any information will be helpful
Thanks a lot in advance.