Came across this error today while trying to use ExceptionManager to write to the eventlog:
Message: The form cannot be submitted to the following location: http://d7014yleimoss:2007/Investments/10118.xml. There is a problem with the Web server. Make sure the Web server exists, try again later or contact the Web server administrator.
Happily this didn't take me time to figure out.
Solution: The user role was created to be able to submit the form, BUT the user was not granted 'contribute' access to to the Forms Library 'Investments'. Grant the logon user the 'contribute' access in the Forms Library Settings and the form submitted successfully.