try solving a softlock

Pilz.Net/Api/ApiServer.cs

@@ -98,6 +98,8 @@ public class ApiServer(string apiUrl) : IApiServer
 
     protected virtual void WaitForSlot()
     {
+        if (MaxConcurentConnections == int.MaxValue)
+            return; // Unlimited in this case
         semaphore ??= new(MaxConcurentConnections);
         semaphore.Wait();
     }
@@ -190,6 +192,7 @@ public class ApiServer(string apiUrl) : IApiServer
         {
             Log.Fatal($"Too many concurent connections", ex);
             Thread.Sleep(1000);
+            FreeSlot();
             return;
         }
 
@@ -204,8 +207,11 @@ public class ApiServer(string apiUrl) : IApiServer
             {
                 Log.Fatal($"Fatal http error retriving context with code {ex.ErrorCode}", ex);
                 if (AutoRestart()) // Try restart the server and skip this context
+                {
+                    FreeSlot();
                     return;
                 }
+            }
             else
                 Log.Error($"Http error retriving context with code {ex.ErrorCode}", ex);
             context = null;