SBS 2011 Essentials based network exhibiting severe performance issues

I am getting very frequent 'not responding' issues when some users are opening / closing office files (usually Excel spreadsheets) which reside in a network share on our SBS 2011 Essentials Server. More than one network share exhibits this problem and I also have a network printer which always takes over ten minutes from putting the print job in the queue to actually starting to print. The server was working fine until a few weeks ago and I am not aware of any thing having changed. It is a 'standard' SBS 2011 Essentials setup with DNS running in the server and DHCP on the gateway router. I am desperately looking for some useful pointers here . Thanks.
Alan BatemanDirectorAsked:
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David AtkinConnect With a Mentor Technical DirectorCommented:
The RDP attempts are probably someone trying to access the server remotely.  Change the RDP port forward on your router to something other than the default 3389.

Checking NIC Drivers would be my first point of call.

I would recommend upgrading the network to gigabit just for the sake of doing it.

Does the server freeze or becomes slow when on RDP/Console?

Did you check Anti-Virus?  Is it scanning during the  day or anything?
David AtkinTechnical DirectorCommented:

Have you checked the servers event logs?  Any warnings/errors?

Do you have a gigabit network? - If so, is the server connected at Gigabit?

Check to see if any updates have been installed.  Check to see if the NIC Driver on the server has been upgraded.

Any Anti-Virus on the server?
Alan BatemanDirectorAuthor Commented:
I have had a good look at the event logs but can't say I've spotted anything obvious to me. I am receiving a few schannel eventid  36888 errors ???  but they seems to happen at random times including the middle of the night and they appear in the event log way back many months ago well before we were experiencing this problem.  I am also seeing frequent batches of Information messages event 1012 Terminal Services - Remote Connection Manager ... client name a exceeded the maximum allowed failed login attempts .... forcibly terminated.  No idea what this refers to but frequent batches of maybe 20-30 at a time. ??  The network is all connected to a 100Mbps switch but it always has been. Many updates have been installed. It installs them automatically and seems to be updated once or twice a week.  Currently no antivirus on the server !!  Do you recommend a scan with any particular product?
In my experience, if a user is reporting this kind of issue ("Not responding") while opening an spreadsheet and the rest of the network isn't; there is no problem on the server or LAN it is actually the user's machine that needs to be checked as it could be running out of resources caused by spyware, virus or a simple HDD problem on the station.

Check the client if you are not having reports for the same issue with others PCs.
Alan BatemanDirectorAuthor Commented:
Sorry I took so long to get back to this.  In the end I upgraded the switch to a full Gigabit switch (had been 10/100) and I also replaced the router for a better one and after a bit of re-wiring in the network cabinet and eliminating a couple of small 'supplementary switches' which had appeared over time because of a lack of wall sockets, the whole thing seems to be much improved. I guess it was always going to happen at some point and it just reached some kind of threshold. Anyway, many thanks. All is well now.
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