Technical Support

In case of technical problems please contact the GAMS support at

To speed up the process, please provide the following information:

  • The GAMS Distribution and the solver you are using.
  • Your GAMS license-id (DC.. in the fifth line of your GAMS license file). See example below:
  • The platform you are working on (Windows, MacOS, Linux, 32 or 64 bit)
  • A copy of the GAMS log and lst file.
  • Any other information that may help us to reproduce the problem, for example a (compressed) GAMS file.
  • In case there are confidential issues, you may send us a scalar version of your model, click here for further instructions .
  • Our e-mail system can handle attachments up to a size of 20MB and does not accept executable files (such as files ending in .exe, bat, ps, or cmd), even if they are sent in a zipped (.zip, .tar, .tgz, .taz, .z, .gz) format. Any message of this type sent to us will be bounced back you. Adding an underscore to the file attachment (e.g. file.zip_) will help.
  • If you want to send us a larger file you can use an upload facility . Please note that Javascript must be enabled and also send an accompanying email to
  • If requested, we are happy to sign a non-disclosure agreement (NDA), also known as a confidentiality agreement (CA).

In general we will get back to you within 8 business hours. However, it has occurred that e-mails have not reached us for unknown reasons. In case you do not receive a reply within 16 business hours then please see our contact page for alternative ways of contacting us.