Error with webserver

Coriron Haz
Coriron Haz used Ask the Experts™
We have an issue when loading a website on our IIS server. Is anyone able to advise where we start in resolving this?

For reference, we have removed the server from the domain and re-joined it in the hopes this would help, but it hasn't made any difference.

IIS Server connects to a separate SQL server for its database.

We are also seeing an ASP.NET issue in the event log:

Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 7/18/2019 1:54:10 PM
Event time (UTC): 7/18/2019 12:54:10 PM
Event ID: 9eec4075582648cbae1807c776b5b714
Event sequence: 8
Event occurrence: 7
Event detail code: 0
Application information:
    Application domain: /LM/W3SVC/1/ROOT/WebaBILLityPro-1-132079278328427605
    Trust level: Full
    Application Virtual Path: /WebaBILLityPro
    Application Path: C:\inetpub\wwwroot\WebaBILLityPro\
    Machine name: WEB-ABILITY
Process information:
    Process ID: 3068
    Process name: w3wp.exe
    Account name: IIS APPPOOL\.NET v4.5
Exception information:
    Exception type: Win32Exception
    Exception message: No authority could be contacted for authentication

Request information:
    Request URL: 
    Request path: /WebaBILLityPro/Login.aspx
    User host address:
    Is authenticated: False
    Authentication Type:  
    Thread account name: IIS APPPOOL\.NET v4.5
Thread information:
    Thread ID: 7
    Thread account name: IIS APPPOOL\.NET v4.5
    Is impersonating: False
    Stack trace:
Custom event details:
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Managing Director
I fixed this myself. Turns out the SQL server that this is linking to had used all its TCP ports (net stat -a). I increased the number of dynamic ports and resolved this. Now just working out why this happened in the first place.

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