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Webstation - Concurrent user limit

Issue

  • Concurrent user
  • IIS limit
  • Webstation user limit
  • Simultaneous request execution limit
  • Concurrent connection limit of 10

Environment

  • TAC Vista
  • Windows
  • Webstation
  • IIS

Cause

Many questions about webstation are how many concurrent user that can connect to the webserver, while the webserver itself do not have any limits except the license used

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0-008-8270-1      "Vista 5.1 Web station 1 CAL - One concurrent user license for Web station 5"
0-008-8271-1      "Vista 5.1 Web station 3 CAL - Three concurrent user licenses for Web station 5"
0-008-8272-1      "Vista 5.1 Web station 6 CAL- Six concurrent user licenses for Web station 5"
0-008-8273-1      "Vista 5.1 Web station 12 CAL- Twelve concurrent user licenses for Web station 5"
0-008-8274-1      "Vista 5.1 Web station Unlimited- License for unlimited users for Web station 5"

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The operating system and/or the IIS do have a limit, not on user connected but connection made to the application.

While using Windows XP this error occurs when 10 connections are met "403.9's  (Access Forbidden: Too many users are connected Internet Information Services).  "
This is not really handled by IIS but the TCPIP.SYS that is set to a limit of 10 connection.

Windows 7 (SP2) introduced a new way to handle the connection, so when the 10 connections are met, the following connections are queued so you will not see any error messages but it can take a while for the page to load. There is a timeout parameter in IIS.

Windows server edition's do not have any limits so always use a windows server for webserver.

NOTE: Webstation takes 1 connection and each TGML open takes 1 connection so if you use 1 webstation and have 5 TGML open you are already using 6 connection.

Resolution

Below is a list for the limits on respective Operating system

 

Windows Server 2008 R2 (IIS v7.5)    
Server:   Server OS = No Limits
     
 Windows 7 (IIS v7.5)2    
Starter:   No IIS
Home Basic:   No IIS
Home Premium:   simultaneous request execution limit of 3, allows multiple sites
Business:   simultaneous request execution limit of 10, allows multiple sites
Enterprise:   simultaneous request execution limit of 10, allows multiple sites
Ultimate:   simultaneous request execution limit of 10, allows multiple sites
     
 Windows Server 2008 (IIS v7.0)    
Server:   Server OS = No Limits
     
 Windows Vista (IIS v7.0)2    
Starter:   No IIS
Home Basic:   No IIS
Home Premium:   simultaneous request execution limit of 3, allows multiple sites
Business:   simultaneous request execution limit of 10, allows multiple sites
Enterprise:   simultaneous request execution limit of 10, allows multiple sites
Ultimate:   simultaneous request execution limit of 10, allows multiple sites
     
 Windows 2003 (IIS v6.0)    
Server:   Server OS = No Limits
WHS:   Server OS = No Limits1
     
 Windows XP (IIS v5.1)    
Home:   No IIS
Professional:   concurrent connection limit of 10, allows only one site
     
 Windows 2000 (IIS v5.0)    
Professional:   concurrent connection limit of 10, allows only one site
Server:   Server OS = No Limits
     
 Windows NT 4 w/ SP3 (IIS v4.0)    
Workstation:   No IIS, PWS installs as part of the NT Option Pack
Server:   Server OS = No Limits, IIS installs as part of the NT Option Pack
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Revision #:
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Last update:
‎2018-09-06 10:58 AM
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