Hmm, my hoster changed the value to 512 but I still can't access the long title articles, same error and the php log file contains no relevant entrys. Is there anything else I can do?

Thank you for your help. I sent an e-mail to my hoster. I hope that he will change the value.
Best regards

I've added your line to the .htaccess, now looks like:
# BEGIN s9y
php_value display_errors On
php_value suhosin.get.max_name_length 512
DirectoryIndex /blog/index.php
...
Doesn't work... is there anything else I can do? Should my hoster change something in the server settings? Is this possible at ...

ok, I changed the .htaccess file in the root folder of my blog. Now it looks like:
# BEGIN s9y
php_value display_errors On
DirectoryIndex /blog/index.php

<Files *.tpl.php>
deny from all
</Files>

<Files *.tpl>
deny from all
</Files>

<Files *.sql>
deny from all
</Files>

<Files *.inc.php>
deny ...

I don't know, which url rewriting I use, where can I check this?

No, I don't use a home server, It's a small hoster where I've bought a few mb to run my web site. I only have access via ftp and I can't check the php error log. I already contacted the support of the hoster but got no useful answer ...

Hello,

I use the s9y blog for more than a year. Yesterday I discovered the following problem:
When I want to read an article of my blog, which has a title length of more than 48 characters, I get the error message 500. Example: http://eric-scheibler.de/blog/index.php?/archives/36-Howto-DLNA-UPNP ...