We have been facing an "Obtaining IP Address" issue at one of our sites for the past four weeks. Due to this, clients are unable to connect to the internet. I have shared an attachment showing that the internet cannot connect and is displaying the "Obtaining IP Address" message.

After our team's observations, we identified some key points: this issue consistently occurs at specific times. I have also attached a PDF file that has been crucial in our efforts to find a solution. If there were something wrong with the controller or the VPN, we would expect the problem to arise at any time.

Our team decided to replace the VPN router, suspecting there might be an issue with the VPN's DHCP service, which could explain why it is not providing IP addresses to clients. However, even after replacing the VPN router, the problem persisted during the same time frame, specifically from 7:30 PM to 11:00 PM, when the VPN is unable to assign IP addresses to clients.

After three to four days of observation, our team decided to replace the OC-300 Controller as well, thinking there might be something wrong with it. However, on the same day, we continued to encounter the "Obtaining IP Address" issue with both the VPN and the controller.

Currently, we are unable to find a solution to this issue. My question is: why is the DHCP unable to assign IP addresses to clients specifically at certain times? If there were something wrong with the VPN, we would expect the problem to occur at any time.

As a temporary solution, we have been restarting the server, which refreshes the DHCP service.

Please look into this matter to help us find a solution, as we face this issue daily and our clients are unable to connect to internet services.