Are you seeing Allocation timeout with PPCGateway server?
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TXSeries regions communicate with SNA systems with synchronization level 2 support if it is configured with PPC gateway. The CICS region is connected to a TCP/IP network through the PPC Gateway server, which provides a link to the SNA network. Allocate timeout is the wait time in seconds for an intersystem request to be started in the PPC Gateway server. You can see below error message in PPC Gateway server message file due to allocation timeout and it can be due to UDP stale binding in sarpcd process endpoint database.
47892 1040548 14/0
failure, local LU = CICSP123, remote LU = TESTAPPC, tpn = ICC0, status =
ENC-ppc-0072: Allocate timed out
You can quickly solve this problem by increasing the Allocate timeout variable to greater than UDP timeout which is 35 seconds.