Connection failed message in browser when trying to access http:///cfg
Same problem in 3.25 here:
http://forum.mikrotik.com/t/3-25-webbox-running-bug/29278/1
I was able to get this page to load after refreshing many times:
I almost killed my keyboard refreshing that same page on my RB750 v3.26. Nothing happened 
I can confirm that 3.26 on x86 is not working. I’ve checked with Firefox 3.5 and IE8 and neither will let me login.
No error on IE8, just back to this page requesting your credentials again;
http://192.168.50.2:81/cfg?page=interface
When I check on the connected users in winbox, I see multiple instances of my username but none apart from the winbox login are for real.
Strangely, on 3.25 (RB500) I can login.
YMMV
OK, X86 bug confirmed, webbox is under fixing process now
a few weeks of vacuous complaints due to an absence of clear description of problem… wow!..
have anybody open a support ticket during this time? =)
If I click any tabs or links it gives “Connection failed”. Hopefully in 3.27 the webbox will be completely fixed. It’s long over due.
Sadly not.
3.27 on x86 does not let me login on webbox.
looks like 3.27 is emergency bugfix release for DNS service, so wait for ‘full-featured’ 3.28 =)
Yuup, and good thing too, I just started noticing that DNS issue on 3.26.
Thanks Mikrotik for quick release.