I have a Windows 2003 Server that acts as a file, FTP, DNS and VPN server for a small (<10 user) company.
Periodically, remote users cannot connect to it via VPN or FTP. However when this happens it is still possible to connect to these services from within the local network and no other problems are reported by users locally.
I have enabled logging for the VPN connections. The log shows the 'internal' connections being made but nothing for the remote ones - not even a 'failed' login.
We also have 2 other servers for a website and email. These remain remotely accessible when we are having the problem.
To permit VPN / FTP connections, we have to reboot the server.
So, the server is running at all times and providing the services, the net connection and router are up and running fine. The only way back is to reboot the server.
Any clues ?