Errors after install

Error messages after fresh install of WordPress 3.8 + MultiSite + Multisite User Registration Manager.

Problem:
After placing [murm-form] to a blog post.

Warning: fopen(/www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/log.txt): failed to open stream: Permission denied in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/murm.php on line 144

Warning: fwrite() expects parameter 1 to be resource, boolean given in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/murm.php on line 145

Warning: fclose() expects parameter 1 to be resource, boolean given in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/murm.php on line 146

I assume its a problem with chmod. Which files do need which chmod to work proper?

http://wordpress.org/plugins/multisite-user-registration-manager/

Solved
I created a file called log.txt and gave the file CHMOD 777 so the error above disappeared.

Problem
After filling out the registration form for a new blog on the site I get this:

Warning: fsockopen(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/includes/Akismet.class.php on line 343

Warning: fsockopen(): unable to connect to .rest.akismet.com:80 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/includes/Akismet.class.php on line 343

Warning: fsockopen(): php_network_getaddresses: getaddrinfo failed: Name or service not known in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/includes/Akismet.class.php on line 343

Warning: fsockopen(): unable to connect to .rest.akismet.com:80 (php_network_getaddresses: getaddrinfo failed: Name or service not known) in /www/htdocs/w0113289/www/wp-content/plugins/multisite-user-registration-manager/includes/Akismet.class.php on line 343

Solved
Disable “Activate Akismet spam filter” which was activated by default at my install.