I had the BIOS version updated to the latest 4.2.1 before attempting OMSA installation.

As for iDRAC, I don't think it can be installed on this server as R805 is pretty old 10G model. 

Here is the output of "omreport system summary" if it helps:

System Summary

------------------
Software Profile
------------------
Systems Management
Name : Dell OpenManage Systems Management Software (64-Bit)
Version : 8.3.0
Description : Systems Management Software
Contains : Apache Tomcat Webserver 8.0.28
: Broadcom SNMP Agent 17.6.4
: Common Storage Module 5.3.0
: Data Engine 8.3.0
: Hardware Application Programming Interface 8.3.0
: Instrumentation Service 8.3.0
: Instrumentation Service Integration Layer 8.3.0
: Inventory Collector 16.01.200
: OMACS 8.3.0
: Operating System Logging 8.3.0
: Oracle Java Runtime Environment 1.7.0_79
: Remote Access Controller Managed Node 8.3.0
: Server Administrator Common Framework 8.3.0
: Server Administrator Core files 8.3.0
: Server Administrator Instrumentation files 8.3.0
: Server Instrumentation SNMP Module 8.3.0
: Server Instrumentation WMI Module 8.3.0
: Storage Management 5.3.0

Operating System
Name : Microsoft Windows Server 2008 R2, Standard x64 Edition
Version : Version 6.1 (Build 7601 : Service Pack 1) (x64) Server Full Installation
System Time : Tue May 17 12:17:38 2016
System Bootup Time : Fri May 13 13:05:36 2016

--------
System
--------
System
Host Name : XXXXX
System Location : Please set the value
Lifecycle Controller : [N/A]

---------------------
Main System Chassis
---------------------
Chassis Information
Chassis Model : PowerEdge R805
Chassis Service Tag : XXXXX
Express Service Code : XXXXXXXXX
Chassis Lock : Present
Chassis Asset Tag :

Processor 1
Processor Brand : Quad-Core AMD Opteron(tm) Processor 2376
Processor Version : Model 4 Stepping 2
Voltage : 1300 mV

Processor 2
Processor Brand : Quad-Core AMD Opteron(tm) Processor 2376
Processor Version : Model 4 Stepping 2
Voltage : 1300 mV

Memory
Total Installed Capacity : 4096 MB
Memory Available to the OS : 4090 MB
Total Maximum Capacity : 131072 MB
Memory Array Count : 1

Memory Array 1
Location : System Board or Motherboard
Use : System Memory
Installed Capacity : 4096 MB
Maximum Capacity : 131072 MB
Slots Available : 16
Slots Used : 4
ECC Type : Multibit ECC

Slot PCI1
Adapter : [Not Occupied]
Type : PCI E
Data Bus Width : 8x or x8
Speed : [Not Obtained, see card documentation]
Slot Length : Long
Voltage Supply : 3.3 Volts

Slot PCI2
Adapter : [Not Occupied]
Type : PCI E
Data Bus Width : 4x or x4
Speed : [Not Obtained, see card documentation]
Slot Length : Long
Voltage Supply : 3.3 Volts

Slot PCI3
Adapter : [Not Occupied]
Type : PCI E
Data Bus Width : 8x or x8
Speed : [Not Obtained, see card documentation]
Slot Length : Long
Voltage Supply : 3.3 Volts

Slot PCI4
Adapter : [Not Occupied]
Type : PCI E
Data Bus Width : 8x or x8
Speed : [Not Obtained, see card documentation]
Slot Length : Long
Voltage Supply : 3.3 Volts

BIOS Information
Manufacturer : Dell Inc.
Version : 4.2.1
Release Date : 04/14/2010

Firmware Information
Name : Baseboard Management Controller
Version : 2.47.00.00 (Build 0)

--------------
Network Data
--------------
Network Interface 0
IP Address : [No Value]
MAC Address : XX-XX-XX-XX-XX-XX

Network Interface 1
IP Address : 192.168.0.2
Subnet Mask : 255.255.255.0
Default Gateway : 192.168.0.1
MAC Address : XX-XX-XX-XX-XX-XX

Network Interface 2
IP Address : [No Value]
MAC Address : XX-XX-XX-XX-XX-XX

Network Interface 3
IP Address : [No Value]
MAC Address : XX-XX-XX-XX-XX-XX

--------------------
Storage Enclosures
--------------------
Storage Enclosures
Name : Backplane
Service Tag : XXXXXX
Express Service Code : XXXXXXXX

I've tried this to no avail. Still getting "The page can't be displayed" in the internal frame.

What logs can I check to get to the root cause?

Robert, I followed the steps you suggested:

• uninstall using OMCleanup,
• reboot,
• download and install OMSA 32bit version,
• reboot again, 
• open using 32-bit IE11

Still getting the same issue.

How can I track it via logs? The only log I found is local_access_log from Tomcat reporting the following error over and over again:

0:0:0:0:0:0:0:1 - - [19/May/2016:10:32:41 -0400] "GET /8AB812C896E3DE44/DataArea?plugin=com.dell.oma.webplugins.FailureWebPlugin&mode=xmlerror&msg=XML%20data%20is%20not%20well-formed&log=Health&vid=8AB812C896E3DE44 HTTP/1.1" 302 35

I had run the Deployment Toolkit and updated all my firmware to the latest. I'm definitely running BMC v2.50 - the latest one. This didn't resolve the issue.

I have tried accessing the page from a remote server using Chrome and IE. Chrome reports "too many redirects" and IE reports "This page can't be displayed"

Note 1: I can successfully run the CLI version of OMSA and get the meaningful results back. 

Note 2: there is no DRAC card installed in the server. I hope this is not a pre-requisite to running OMSA.

Yup, it booted fine and I was able to use OMSA from it. Still don't know why every OMSA installation I do from within Windows fails to show the internal frame...

After couple of days of fighting with almost everything I finally figureout what caused this problem. Strangely - on the other node of our cluster OSMA worked fine and this drived me crazy.

In my case it was simply installed old version of OMSA - We've installed 7.4.4. After reinstalling it with 9.1.0 version - everthing started to work again.

Have you tried OMSA 9.4.0, by chance? If not, any interest, or are you happy with the 7.4 release? 

If you'd like to take a crack at it with me, what is the server model?

Thanks! I finally got this fixed by indeed installing 7.4 first and then upgrade it it 9.4.

I tried numerous versions and supposed fixes, but only this worked.

Model: PowerEdge R730

@toymanek​ Thank you very much!

Obviously this answer cannot come from Dell.
Joke support service.