Hi Aaron,
I am not sure what web agent version are you referring to here, but I just tested with few agent version and doesn't seem to be working if I post to non-existing fcc page from a custom login page..
Here is what I have in my custom login page :
<form NAME="Login" ACTION="x.fcc" METHOD="POST">
R12.52SP1CR5
[03/24/2017][11:30:17][4764][3924][SmFCC.cpp:2786][SmFcc::getLocalePath][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][Localized Path = C:\Program Files\CA\webagent\win64\samples\forms\x.fcc, working locale = default]
[03/24/2017][11:30:17][4764][3924][CSmFormTemplateObj.cpp:224][CSmFormTemplateObj::LoadFormTemplate][][][][][][][No such file or directory]
[03/24/2017][11:30:17][4764][3924][CSmFormTemplateCache.cpp:171][CSmFormTemplateCache::GetForm][][][][][][][Unable to serve form template 'C:\Program Files\CA\webagent\win64\samples\forms\x.fcc' from disk.]
[03/24/2017][11:30:17][4764][3924][SmFCC.cpp:1336][SmFcc::setup][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][Unable to process form C:\Program Files\CA\webagent\win64\samples\forms\x.fcc.]
[03/24/2017][11:30:17][4764][3924][CSmResourceManager.cpp:207][CSmResourceManager::ProcessAdvancedAuthResource][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][SM_WAF_HTTP_PLUGIN->ProcessAdvancedAuthResource returned SmExit.]
[03/24/2017][11:30:17][4764][3924][CSmHighLevelAgent.cpp:1003][ProcessAdvancedAuthentication][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][ResourceManager returned SmExit, end new request.]
R12SP3CR12
[03/24/2017][11:30:17][4764][3924][SmFCC.cpp:2786][SmFcc::getLocalePath][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][Localized Path = C:\Program Files\CA\webagent\win64\samples\forms\x.fcc, working locale = default]
[03/24/2017][11:30:17][4764][3924][CSmFormTemplateObj.cpp:224][CSmFormTemplateObj::LoadFormTemplate][][][][][][][No such file or directory]
[03/24/2017][11:30:17][4764][3924][CSmFormTemplateCache.cpp:171][CSmFormTemplateCache::GetForm][][][][][][][Unable to serve form template 'C:\Program Files\CA\webagent\win64\samples\forms\x.fcc' from disk.]
[03/24/2017][11:30:17][4764][3924][SmFCC.cpp:1336][SmFcc::setup][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][Unable to process form C:\Program Files\CA\webagent\win64\samples\forms\x.fcc.]
[03/24/2017][11:30:17][4764][3924][CSmResourceManager.cpp:207][CSmResourceManager::ProcessAdvancedAuthResource][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][SM_WAF_HTTP_PLUGIN->ProcessAdvancedAuthResource returned SmExit.]
[03/24/2017][11:30:17][4764][3924][CSmHighLevelAgent.cpp:1003][ProcessAdvancedAuthentication][000080fe00000000ff420000bd40edfe-129c-58d4b5f1-0f54-016c4823][*127.0.0.1][][][][][ResourceManager returned SmExit, end new request.]
Regards,
Ujwol Shrestha