If you are using a free academic license,
perform an academic validation step before retrieving your license
key. This step checks your domain name against our list of known
academic domains. This section will help you resolve validation
Not a recognized academic domain
grbgetkey produces a message that looks like this:
ERROR 303: hostname mymachine.mydomain (126.96.36.199) not recognized as belonging to an academic domainit means your domain isn't on our academic domain list. Please make sure you are connected to your university network. If you are validating a home machine and the university provides a VPN, please connect to it before retrieving your license. If the reported host name is a valid university address, please send the specific error message you received to
firstname.lastname@example.org we'll add your domain.
If you are having trouble validating your license through a VPN, note
that some VPNs are configured to use split tunneling, where
traffic to public internet sites is routed through your ISP. You
should ask your network administrator whether the VPN can be
configured to route traffic to
gurobi.com through the private
Some machines connect to the internet through a proxy server. Unfortunately, such configurations are incompatible with our academic validation process.
No reverse DNS information
grbgetkey produces a message that only references a numerical
IP address, like this:
ERROR 303: hostname 188.8.131.52 (184.108.40.206) not recognized as belonging to an academic domainit means your machine has no reverse DNS information. This usually happens when you are connecting to the Internet through a DHCP server that does NAT (network address translation) or PAT (port address translation), but does not provide DNS information for its clients. The simplest way to resolve this issue is to ask your network administrator to add a DNS entry (a PTR record) for the DHCP device itself.
There is unfortunately no way for us to validate your academic license without reverse DNS information. You can visit this site to check DNS information for your IP address and to obtain more information about reverse DNS.