2532398 - Web Dispatcher - Load balancing fail after some time.

• The Web Dispatcher is performing the load balancing properly, but after some time you see a huge usage in only one instance of backend. 
• The following entries are visible on Web Dispatcher trace level 2 (dev_webdisp):

[Thr 1] HTR: Adding session id <Generic ID>, group !DIAG* to session table, server APPSERVER1_SID_00
[Thr 1] IcrITabInsertEntry(1): FtInsert failed
[Thr 1] HTR: Failed to insert session, cleanup old entries.
[Thr 1] IcrITabInsertEntry(1): FtInsert failed
[Thr 1] HTR: Failed to insert session, use default server.
[Thr 1] IcrITabGetEntry(1): key: 0:1999398162, inst_name: APPSERVER3_SID_00
[Thr 1] HTR: HtrIUpdateSessionTable: rc=-3, opt=2, session id ICR_DEFAULT_SESSION_ID, group !DIAG*

• SAP Netweaver release independent
• Web Dispatcher

ESID, wdisp/HTTP/context_timeout, wdisp/HTTP/max_session_tab_entries, Session Dispatching, 503, overload, freeze, users, disconnect, SAP Webdispatcher Admin tool, admintool, webadmin , KBA , BC-CST-WDP , Web Dispatcher , BC-CST-IC , Internet Communication Manager , Problem