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Cisco Bug: CSCvu71743 - ENH: FDM - Default TCP MSS 0 - Allow MSS Negotiation

Last Modified

Jul 03, 2020

Products (1)

  • Cisco Firepower NGFW

Known Affected Releases

6.6.0 6.7.0

Description (partial)

The default TCP MSS value on FTD Managed by FDM is 0, which means that it is fully allowing MSS Negotiation between both end-points of the TCP connection.
This can cause problems with some traffic when using VPN, PPPoE, ADSL, where a lower MSS might be required.

Symptoms can include:
HTTPS Sites no correctly loading, packet loss through VPN connections

FTD Managed by FDM
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