Fortigate 300E SSL VPN web portal stop responding

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last Monday and this Monday, when we got office to start work, we found the ssl vpn web portal stop responding. but other function runs well. i guess the problem is that i added a RDP predefined bookmarks 2 weeks ago. but the rdp is a essential item for hundred people. now the only solution from me is power reboot the device. Could anyone help me to solve the problem? Thanks,Adsnow

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Till now, 3 weeks, we found it works well. maybe the session is too long, we changed the RDP idle account log off time from 2 hours to half hour, log off the disconnect account from 1 hour to half hour. hope the problem can be solved. if you have the same case, hope this can help you a little.