Thanks for the sugegstions I ran the curl with -v option [azuki@AlmaDevVM Key_Server_Module]$ curl -v -d @Test_Inputs/iOS/spc_v3_ios_uhd_no_lease_2048.json localhost:8080/fps * Trying ::1:8080... * Connected to localhost (::1) port 8080 (#0) > POST /fps HTTP/1.1 > Host: localhost:8080 > User-Agent: curl/7.76.1 > Accept: */* > Content-Length: 5947 > Content-Type: application/x-www-form-urlencoded > * Empty reply from server * Closing connection 0 curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$ Also when I checked httpd logs I do see a couple of errors. [DEBUG] ❌ Assertion failure: paramErr (-42585) [src/parse_certificates.swift:36] src/parse_certificates.swift:13: Fatal error: 'try!' expression unexpectedly raised an error: src.FPSStatus.paramErr [Thu Jan 22 04:17:30.168292 2026] [core:notice] [pid 1004898:tid 1004898] AH00051: child pid 1009053 exit signal Illegal instruction (4), possible coredump in /etc/httpd timestamp="2026-01-22 04:18:01,830",FP_TOOLN="fpssdk",FP_TOOLV="26.0.0",FP_PID="1021431",FP_FL="parse_certificates.swift",FP_LN="35",FP_ERRCODE="-42585",Error reading certificate file (../credentials/test_certificates.json): Error Domain=NSCocoaErrorDomain Code=260 "The file doesn’t exist."UserInfo={NSUnderlyingError=Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory", NSURL=../credentials/test_certificates.json -- file:///home/azuki/, NSFilePath=/home/credentials/test_certificates.json} [DEBUG] ❌ Assertion failure: paramErr (-42585) [src/parse_certificates.swift:36] src/parse_certificates.swift:13: Fatal error: 'try!' expression unexpectedly raised an error: src.FPSStatus.paramErr [Thu Jan 22 04:18:03.204641 2026] [core:notice] [pid 1004898:tid 1004898] AH00051: child pid 1021431 exit signal Illegal instruction (4), possible coredump in /etc/httpd timestamp="2026-01-27 15:05:22,145",FP_TOOLN="fpssdk",FP_TOOLV="26.0.0",FP_PID="1021588",FP_FL="parse_certificates.swift",FP_LN="35",FP_ERRCODE="-42585",Error reading certificate file (../credentials/test_certificates.json): Error Domain=NSCocoaErrorDomain Code=260 "The file doesn’t exist."UserInfo={NSUnderlyingError=Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory", NSURL=../credentials/test_certificates.json -- file:///home/azuki/, NSFilePath=/home/credentials/test_certificates.json} [DEBUG] ❌ Assertion failure: paramErr (-42585) [src/parse_certificates.swift:36] src/parse_certificates.swift:13: Fatal error: 'try!' expression unexpectedly raised an error: src.FPSStatus.paramErr [Tue Jan 27 15:05:23.587233 2026] [core:notice] [pid 1004898:tid 1004898] AH00051: child pid 1021588 exit signal Illegal instruction (4), possible coredump in /etc/httpd timestamp="2026-01-27 15:06:10,198",FP_TOOLN="fpssdk",FP_TOOLV="26.0.0",FP_PID="1182129",FP_FL="parse_certificates.swift",FP_LN="35",FP_ERRCODE="-42585",Error reading certificate file (../credentials/test_certificates.json): Error Domain=NSCocoaErrorDomain Code=260 "The file doesn’t exist."UserInfo={NSUnderlyingError=Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory", NSFilePath=/home/credentials/test_certificates.json, NSURL=../credentials/test_certificates.json -- file:///home/azuki/} [DEBUG] ❌ Assertion failure: paramErr (-42585) [src/parse_certificates.swift:36] src/parse_certificates.swift:13: Fatal error: 'try!' expression unexpectedly raised an error: src.FPSStatus.paramErr [Tue Jan 27 15:06:11.639857 2026] [core:notice] [pid 1004898:tid 1004898] AH00051: child pid 1182129 exit signal Illegal instruction (4), possible coredump in /etc/httpd timestamp="2026-01-27 15:07:13,904",FP_TOOLN="fpssdk",FP_TOOLV="26.0.0",FP_PID="1009073",FP_FL="parse_certificates.swift",FP_LN="35",FP_ERRCODE="-42585",Error reading certificate file (../credentials/test_certificates.json): Error Domain=NSCocoaErrorDomain Code=260 "The file doesn’t exist."UserInfo={NSFilePath=/home/credentials/test_certificates.json, NSURL=../credentials/test_certificates.json -- file:///home/azuki/, NSUnderlyingError=Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"} [DEBUG] ❌ Assertion failure: paramErr (-42585) [src/parse_certificates.swift:36] src/parse_certificates.swift:13: Fatal error: 'try!' expression unexpectedly raised an error: src.FPSStatus.paramErr [Tue Jan 27 15:07:15.708569 2026] [core:notice] [pid 1004898:tid 1004898] AH00051: child pid 1009073 exit signal Illegal instruction (4), possible coredump in /etc/httpd I hope this helps to understand what might be the issue.

I have confirmed that server is running. I am able to get version [azuki@AlmaDevVM ~]$ cd server_setup/FairPlay_Streaming_Server_SDK_26/FairPlay_Streaming_Server_SDK_26/Development/Key_Server_Module/ [azuki@AlmaDevVM Key_Server_Module]$ ls credentials parse_fps Rust Swift Test_Inputs [azuki@AlmaDevVM Key_Server_Module]$ curl localhost:8080/fps/v 26.0.0 I had tried few more requests and i noticed same response for all [azuki@AlmaDevVM Key_Server_Module]$ curl -d @Test_Inputs/iOS/spc_ios_hd_lease_2048.json localhost:8080/fps curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$ curl -d @Test_Inputs/tvOS/spc_tvos_get_client_info_1024.json localhost:8080/fps curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$ curl -d @Test_Inputs/iOS/spc_v3_ios_uhd_no_lease_2048.json localhost:8080/fps curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$

Tried this. Now I see curl: (52) Empty reply from server curl -d @Test_Inputs/iOS/spc_ios_hd_lease_2048.json localhost:8080/fps curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$ Any further help would be highly appreciated. Is it specific to this OS? Any other working reference would be helpful.

[azuki@AlmaDevVM Key_Server_Module]$ ps -aef | grep httpd root 1004896 1 0 Jan21 ? 00:00:00 sudo httpd -D FOREGROUND root 1004898 1004896 0 Jan21 ? 00:00:01 httpd -D FOREGROUND apache 1009052 1004898 0 Jan21 ? 00:00:00 httpd -D FOREGROUND apache 1009054 1004898 0 Jan21 ? 00:00:06 httpd -D FOREGROUND apache 1009073 1004898 0 Jan21 ? 00:00:06 httpd -D FOREGROUND apache 1021431 1004898 0 04:17 ? 00:00:00 httpd -D FOREGROUND apache 1021493 1004898 0 04:17 ? 00:00:00 httpd -D FOREGROUND azuki 1021571 1021387 0 04:17 pts/1 00:00:00 grep --color=auto httpd [azuki@AlmaDevVM Key_Server_Module]$ curl -d @Test_Inputs/iOS/spc_ios_hd_lease_2048.json localhost:8080/fps curl: (52) Empty reply from server [azuki@AlmaDevVM Key_Server_Module]$ With this, I see empty re[ply now