A fix is available
APAR status
Closed as program error.
Error description
MQ on z/OS Queue Manager using CHLAUTH. CSQX777E message is issued for a channel being blocked . An incorrect DNS entry is showing up in the message .
Local fix
add an '*' (asterisk) to the end of the Address field in Channel Authorization Record.
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 1 Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Message CSQX777E 'channel has been * * blocked' because the hostname used for * * validation has invalid characters * * appended. * **************************************************************** A client attempts to connect to a queue manager defined with CHLAUTH and REVDNS enabled. A channel authentication record has been defined to permit access which uses a hostname to identify the client rather than an IP address. However the client connection is rejected with message CSQX777E 'channel has been blocked'. The rejection occurs because additional characters have been appended to the hostname. This can occur when authorization processing copies the hostname in to a temporary buffer that contains residual storage from a previous connection attempt that used a longer hostname. The current hostname is written over the previous one for the length of the new hostname only, leaving residual characters from the previous hostname appended to the end.
Problem conclusion
Authorization processing has been updated for the reported problem to initialize the temporary host entry buffer to nulls before the host entry is copied in to it.
Temporary fix
Comments
APAR Information
APAR number
PH02993
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
100
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-09-19
Closed date
2018-11-01
Last modified date
2019-01-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI59476
Modules/Macros
CSQXTNSC
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
R100 PSY UI59476
UP18/12/15 P F812
Fix is available
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Document Information
Modified date:
02 January 2019