NetScaler Gateway does not display logon page after upgrade.

Complete the following steps to resolve this issue:

1. Revert back to previous working version of NetScaler Gateway.

2. Change UI theme to "default" and save config.

3. Upgrade to NetScaler Gateway 11.

4. Now customize UI theme again.

Problem Cause

NetScaler Gateway website in 10.1 was customized. It was not changed back to Default before upgrade. As a result it did not display correctly after upgrade.