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I have read about possible certificate issues which could be a cause as wellYou probably have " Protocol-Options" enabled on that firewall policy: Possible solutions: 1. Install the FortiGate SSL Proxy certificate on the devices. 2. Changed ports for IMAPS in the protocol-options profile. 3. Remove the protocol-options from the firewall policy.
FCNSA, FCNSP
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FortiGate 200A/B, 224B, 110C, 100A/D, 80C/CM/Voice, 60B/C/CX/D, 50B, 40C, 30B
FortiAnalyzer 100B, 100C
FortiMail 100,100C
FortiManager VM
FortiAuthenticator VM
FortiToken
FortiAP 220B/221B, 11C
what if we configure firewall in proxy mode
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