We have just finished relocating our AS400 from one site to another. Hence change of IP was done but setup remains the same machine wise. After which, some FTP and response issues started to arise. My AS400 is a two partition machine running on the same segment as my users and other interfaces.
Issue 1 - Cannot FTP from AS400 (UAT) to Windows server (remote).
- This was working fine prior to relocation. Now, we cannot perform GET for files exceeding 1kb (both secured and Non secured). But PUT is working fine. We have opened up all ports in firewall to eliminate any restriction issues. We have already checked the Maximum Transmission Unit (MTU) of AS400 and the switches and are both set to 1500. This only happens in only one of the partition (UAT), the other one is working perfectly fine (DEV). We have done a series of communication trace, it appears that the DEV is by default using a framesize of 590 during transfer. And the remote server is issuing a RESET during transmission from UAT. We have added an additional routing in UAT going to the windows server with MTU of 576 and it works fine. This seems to be a workaround though. Any advice on how we can resolve the RESET thing, and what causes it?
Issue 2 - Slow response from AS400
- We have a windows server pulling data from AS400 (UAT again). And based from previous data, current response time is 20 secs delayed. Admittedly, Im not entertaining the Performance issue thing because of some network issues arising (Issue 1) and my Performance tuning skills are not that strong :-(. Nevertheless, anything from the AS400 and Network end that may contribute in improving this response time.
Thanks in advance.