A fix is available
APAR status
Closed as program error.
Error description
. The web server is setup to use the Fast Response Cache Accelerator (EnableFRCA On is specified in the httpd.conf file). When clients are running on the same system, occasionally the first (only) request sent on a connection will not get a response from the server. The server's logs will not show any information for the affected connections. .
Local fix
. Use one of the following options to avoid this problem: - Disable FRCA on this server. EnableFRCA Off - Enable a packet trace, even if filters prevent any packets from being recorded: VARY TCPIP,tcpipname,PKKTRACE,ON,PROT=240 - The following command may be entered every time TCPIP is recycled: MODIFY tcpipname,FRLSOFF Other symptoms: A SYSTCPIP CTRACE with OPTIONS=(AFP,TCP) will show an 'FrLS exit' record for the client side of the affected connection before the 'Afpa Add Connection Entry' record for the server side of the connection.
Problem summary
**************************************************************** * USERS AFFECTED: * * All users of the Communications Server for * * z/OS Version 2 Release(s) 1 IP * **************************************************************** * PROBLEM DESCRIPTION: * * TCP/IP client connections to Web Server * * using FRCA time out. * **************************************************************** * RECOMMENDATION: * * Apply PTF * ****************************************************************
Problem conclusion
TCP connection times out attempting to connect to a Web Server using FRCA. This occurs when the client and server are on the same TCP/IP stack. In this scenario, the Faster Local Sockets function may be employed on the first write of data before the connection has transitioned to use FRCA. This invalid scenario should be protected with locks. However, the client side does not obtain the correct tcb lock preventing the necessary synchronization.
Temporary fix
Comments
APAR Information
APAR number
PI17154
Reported component name
TCP/IP V3 MVS
Reported component ID
5655HAL00
Reported release
210
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-05-02
Closed date
2014-06-12
Last modified date
2014-09-03
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI18784
Modules/Macros
EZBT6FWR EZBTCFWR
Fix information
Fixed component name
TCP/IP V3 MVS
Fixed component ID
5655HAL00
Applicable component levels
R210 PSY UI18784
UP14/08/09 P F408
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
03 September 2014