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unable to load admin page asa 5512


I have a new ASA 5512-X, out-of-the-box, which I am unable to open the admin web page on.


Laptop - Lenovo Windows 7 64 bit

Browsers - Firefox 28 & IE 11

Java is installed and correct vesrions

ASDM on the 5512 - asdm-66114.bin

ASA Ver - asa861-2-smp-k8.bin

https is enabled and I'm using IP addresses that are allowed connectivity to the 5512

When i browse to I am presented with a certificate error as expected, I accept the certificate, then the page hangs.  This happens on both Firefox and IE. 

Wireshark shows the TCP 3-way handshake and the TLS/SSL negotiation which is then immediately followed by the 5512 sending SSL data then a FIN,PSH,ACK packet back to my PC.  then a load of TCP retransmits from both my PC and the 5512.

Now, I tried a different PC (Dell), same OS, same ver of Firefox but IE ver.9, and did not have any problems being presented with the 'Run ASDM Wizard' page.

Has anyone had a similar issue?  Has anyone please got any idea what config on my PC may be at fault?


Many thanks for any suggestions and help.



  • Security Management
Everyone's tags (3)
Hall of Fame Super Silver

Please have a look at the ssl

Please have a look at the ssl settings on the ASA: "show run | i ssl".

You may not have strong ciphers enabled and the PC with the newer browser does not accept the default weak ciphers. I make it a habit to setup ASAs with:

ssl encryption 3des-sha1 aes128-sha1 aes256-sha1 rc4-md5

Those are all strong ciphers.

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