http 404 from my windows to my Linux server how to fix

we had windows stat server talking to Linux stat 580 for 5 years, just this week we are getting http 404 error, we do connect to the server but get this error header now found, take a look, any one have a helpful idea on how to fix.

[root@ps-statlp01 tmp]# strace -fvttTyy -s 256 -o /tmp/statlp01.out curl --insecure -v http://ps-???????????????.com:8081/stat
* About to connect() to ps-???????????????.com port 8081 (#0)
*   Trying 10.65.99.81... connected
* Connected to ps-???????????????????????) port 8081 (#0)
> GET /stat HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.44 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: ps-??????????????????????:8081
> Accept: */*
>
< HTTP/1.1 404 Not Found
< Connection: keep-alive
< X-Powered-By: Undertow/1
< Server: WildFly/8
< Content-Type: text/html;charset=UTF-8
< Content-Length: 68
< Date: Wed, 07 Oct 2020 13:58:37 GMT
<
* Connection #0 to host ps-statlp01.corp.saic.com left intact
* Closing connection #0
[root@ps-statlp01 tmp]#