Hi guys.

I have two servers:

  1. Client Facing Production Server
  2. API Server.

The Client facing sever (Server1) sends requests to the API Server (Server2).

Server2 is hosted with one staric IP address and is accessible through three domain names, e.g. www.domain1.com, domain1.com, test.domain2.com.

Often times the Server1 seems to clog up Server2 on domain1.com, but Server2 remains perfectly accessible through www.domain1.com and *test.domain2.com.

The clogged domain seems to be the one most used, and often auto-corrects itself.

Can someone please explain to me what causes this?

Windows Server 2016 with IIS 10, php 5.6.40, MySQL 5.0.11 (on Server1) and the same but with MSSQL 2017 on Server 2.

Any help would be greatly appreciated.