After trial and error, I now feel that there is something in the path between my remote computer and the splunk web that is obfuscating the login request. When I send the initial login request un-encrypted on http port 8000, I see the "Server Error" warning. As soon as I enable https, I can login from the same machine without issues. Since the https page sends the login encrypted, whatever is in the path can no longer mess with it. I have not checked my IPS and Firewall logs yet, but pretty sure that one of them is causing the issue. I tried the remote login from another remote machine that bypasses them and can now login without https enabled.
Planning to check the log and capture to see what the splunk side sees. Thanks everyone.
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