IIS Request Header Issue Resolution & SQL User Creation

I'm experiencing an issue with my IIS on a Windows server. The error message I'm receiving is 'The size of the request headers is too long'. I need someone to troubleshoot this issue. Additionally, I need assistance with creating user accounts for SQL Server and some subdomains.

Key tasks:
- Diagnose and resolve 'The size of the request headers is too long' error on IIS
- Create user accounts on SQL Server
- Set up some subdomains

Ideal skills and experience:
- Extensive experience with IIS on Windows Server
- Proficient in SQL Server user account creation
- Knowledgeable in subdomain setup
- Strong troubleshooting skills
- Familiarity with request header issues in web servers