[TYPO3-english] Problem with upgrade: Your browser version looks incompatible with this TYPO3 version!

[Stephan Großberndt]

Hi Bert,

make sure all caches are deleted - as well in the clients browser (!) 
(which version of which browser by the way?) as in typo3 (typo3temp, 
typo3conf/temp_*).

If that does not work and you are only a bit into PHP debugging you can 
check whats happening: It will be some kind of problem with the user 
agent string the browser is sending. did the client override it?

The exception is thrown in typo3/init.php:388 if $CLIENT['BROWSER'] is 
empty. $CLIENT is filled in t3lib/class.t3lib_div.php:4276 - if the 
useragent does not match any of the strings $CLIENT['BROWSER'] will be 
empty.

So to test it you should insert a new line 4291 (before

if ($bInfo['BROWSER']) {

) and do a

var_dump($useragent);var_dump($bInfo);

there.

Then call the login URL from the client having problems, check the 
output and if you cant figure it out by yourself then post the output here.

By the way 4.5.36 should be only a first step for you now as 4.5 will 
get security updates only until march of next year. So you should 
consider (depending on the extensions you use) to upgrade from 4.5 LTS 
to 6.2 LTS.

Regards,
Stephan

Am 08.10.2014 um 19:21 schrieb Bert Hiddink [BENDOO e-work solutions]:
> Hello,
>
> A client was using an old version of TYPO3 (4.3.x) and suddenly got this
> error when trying to log into the Backend:
>
> "Browser error
>
> Your browser version looks incompatible with this TYPO3 version!"
>
> So I decided to upgrade first to a 4.5 LTS version (4.5.36).
>
> However, when trying to log into the BE, I still got this error:
>
> "Oops, an error occured!
>
> Browser Error: Your browser version looks incompatible with this TYPO3
> version!"
>
>  From what I remember this error was due to a hardcoded browser version
> (MSIE, Mozilla, etc) but was resolved a long time ago.
>
> How could this problem still come up with 4.5.x LTS? Any ideas/suggestions?
>
> Thanks in advance!
>
> Regards,
> Bert