url = http://oukl.mshu.edu.ru/lmsold
id = 180186

If you tinker with the site registration database for testing purposes and inadvertently wind up with this site being checked it generates the following error.

!!! Error writing to database !!!
!! Incorrect string value: '\xD1' for column 'errormsg' at row 1
UPDATE mdl_hub_site_directory SET timelinkchecked = ?,unreachable = ?,score = ?,errormsg = ?,fingerprint = ?,timeunreachable = ? WHERE id=?
[array (
0 => 1436972933,
1 => 1,
2 => -1,
3 => 'The requested URL returned error: 500 ( Компонентом Forefront TMG обнаружена петля прокси-цепочки. Это ошибка конфигурации политики маршрутизации Forefront TMG. Обрати,
4 => NULL,
5 => 1436972933,
6 => '180186',
)]
Error code: dmlwriteexception !!
!! Stack trace: * line 446 of /lib/dml/moodle_database.php: dml_write_exception thrown

• line 1392 of /lib/dml/mysqli_native_moodle_database.php: call to moodle_database->query_end()
• line 1424 of /lib/dml/mysqli_native_moodle_database.php: call to mysqli_native_moodle_database->update_record_raw()
• line 202 of /local/linkchecker/multicheck.php: call to mysqli_native_moodle_database->update_record()
• line 112 of /local/linkchecker/multicheck.php: call to update_site()
  !!