This is a disruptive problem for us as well. Same 500 errors. Had to spend time yesterday re-implementing altool with polling, which seems to take much longer than using notarytool with --wait. Lots of time wasted troubleshooting and updating build scripts, when I have product updates I need to distribute. How does Apple not see the 500 errors, which are internal server errors. How do you get a "local" 500 error, unless from terrible programming? ¯_(ツ)_/¯.

Do you mean hostname / localhost name? You can use the SystemConfiguration framework: #include <stdio.h> #include <SystemConfiguration/SystemConfiguration.h> int main() { char hostname[1024]; const char* name = "name"; CFStringRef nameRef = CFStringCreateWithCString(kCFAllocatorDefault, name, kCFStringEncodingASCII); SCDynamicStoreRef store = SCDynamicStoreCreate(kCFAllocatorDefault, nameRef, NULL, NULL); CFStringRef hostnameRef = SCDynamicStoreCopyLocalHostName(store); CFStringGetCString(hostnameRef, hostname, 128, kCFStringEncodingUTF8); printf("Hostname: %s\n", hostname); }