New Splunk Web Installation Not Showing Login Fields

[findtopher]

I have just installed Splunk for the first time using the Linux RPM (splunk-5.0.3-163460-linux-2.6-x86_64.rpm).

Everything works exactly as all the manuals and tutorials suggest, until I try to load the Splunk Web interface; when I try to connect to the web interface I get no login fields.

My web_service.log doesn't show anything interesting:

2013-05-30 10:21:23,564 INFO    [51a760638f1de5990] decorators:323 - require_login - no splunkd sessionKey variable set; cherrypy_session=18eef8c63da5b41278511fe6665961db00bcc0eb request_path=/en-US/
2013-05-30 10:21:23,564 INFO    [51a760638f1de5990] decorators:344 - require_login - redirecting to login

Nor does my splunkd_access.log:

127.0.0.1 - - [30/May/2013:10:19:17.000 -0400] "GET /services/server/info HTTP/1.1" 200 4333 - - - 2ms
127.0.0.1 - - [30/May/2013:10:21:23.712 -0400] "GET /services/server/info HTTP/1.1" 200 4333 - - - 2ms

I've tried this using Chrome on Windows and OS X, Safari, and Internet Explorer. I have confirmed that Javascript and Cookies are enabled on all tested browsers.

Quite simply, I'm unable to even start working with splunk.

Help?

Update after troubleshooting:

If I use ssh to forward port 8000 (ssh -L 8000:127.0.0.1:8000 splunk) I am able to connect to localhost:8000 and am prompted with username and password fields. Attempts to connect from outside the system remain unsuccessful.

[mathru]

try disabling tcp offloading (TCO)

ethtool -K eth0 tx off rx off (replace eth0 with ethernet it is bound to)

[davetarn]

I'm experiencing the same issue, but only when I'm attempting to access the UI over VPN. On my local network, it seems to work fine.