A file transfer initiated from z/OS to a new server failed with messages:
XCOMM0780E Txpi 701: Received remote data block at 0X1A9281E4 starting with invalid EyeCatcher 0X32303137
XCOMM0780E Txpi 227: Socket received 0 bytes: partner closed socket. Last error
How do we determine the cause of the problem?
The EyeCatcher of x'32303137' in message "XCOMM0780E Txpi 701: Received remote data block at 0X1A9281E4 starting with invalid EyeCatcher 0X32303137", which translates to "2017" is helpful in telling us that the code is not recognized or used by XCOM to confirm that the reads/writes are all XCOM. Here are some of the recognized codes:
g_dwcEyeCatcher = 0x98765432;
dwSSLv3Handshake = 0x16030000;
dwTLSv10Handshake = 0x16030100;
dwTLSv11Handshake = 0x16030200;
dwTLSv12Handshake = 0x16030300;
With the above information the user was able to determine that XCOM on the remote server had not been started. Once XCOM on the remote server was started all transfers were successful.