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Server does not support RFC 5746, see CVE-2009-3555 What does it mean and what should I do?

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RFC is a Remote Function Call and CVE is Common Vulnerabilities and Exposures. Since RFC is commonly used for server exploitation via viruses, most servers turn that function off, resulting in an error message like you reported.
While this may be a legitimate function call, this often means that your system has been compromised by a virus or malware. Run a reputable virus and malware scanning tool, like this one.
You can read more about your error message here.

Posted on Jan 18, 2011

  • Anonymous May 24, 2011

    RFC stands for "Request for Comments", see

    RFC 5746 is about a particular vulnerability in TLS/SSL.

    The Firefox warning is re-assuring: it means the server does suffer the vulnerability described in CVE-2009-3555 and resolved by the means described in RFC 5746.




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RFC stands for Request for Comments, see

A vulnerability affecting TLS/SSL was disclosed in CVE-2009-3555, see

RFC 5746 is a memo explaining how to fix it.

Firefox information message is re-assuring: it means the server doesn't suffer the vulnerability.

Posted on May 24, 2011


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VCI 0-65535 address range
VPI 0-255 address range
AAL5 support
IEEE 802.1.d Transparent Learning Bridge (dynamic learning of up to 255 addresses)
Spanning Tree support
FCC Part 15, Class B
CE certification
DSL interface: RJ-11 or RJ-45 (Europe)
Ethernet interface: RJ-45
USB Type B interface (5200, 5500 series)
Diagnostic LEDs
Power, DSL, Activity, Ethernet status; USB status (5200, 5500 series)
Intuitive, Web-based GUI management access
SNMP support
Comprehensive hardware diagnostics
Media Interface
RJ-11 or RJ-45 (European) DSL WAN connection
10/100Base-T RJ-45 Ethernet LAN connection
USB Type B LAN connection (5200, 5500 series)
12V power supply included, 700ma max. 5400/5500 - 12 VDC, 1000ma max.

DHCP server/DHCP client
Network Address Port Translation (NAPT)
Network Address Translation (NAT)
Packet filtering
RFC 2364 Point-to-Point Protocol over ATM PVCs (PPPoA)
RFC 2516 Point-to-Point Protocol over Ethernet (PPPoE)
RFC 2684 (formerly 1483) Bridged Ethernet and routed encapsulation Routing
Standards Compliance
IEEE 802.3
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