diff --git a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/Repository.java b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/Repository.java
index 927dd3f2af..95b0602692 100644
--- a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/Repository.java
+++ b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/Repository.java
@@ -357,10 +357,12 @@ public class Repository implements FileSystemListener, RepositoryLogger {
 			LinkedHashMap<String, User> newUserMap = new LinkedHashMap<>();
 			for (User user : users) {
 				String userName = user.getName();
-				if (UserManager.ANONYMOUS_USERNAME.equals(userName) ||
-					!allUsers.contains(userName)) {
+				if (UserManager.ANONYMOUS_USERNAME.equals(userName)) {
 					continue; // ignore
 				}
+				if (!allUsers.contains(userName)) {
+					throw new IOException("Unknown user specified: " + userName);
+				}
 				if (!user.hasWritePermission() && !user.isReadOnly() && !user.isAdmin()) {
 					throw new IOException("User specified with invalid permission: " + userName);
 				}
diff --git a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/security/TokenGenerator.java b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/security/TokenGenerator.java
index ea2349c397..8744532f88 100644
--- a/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/security/TokenGenerator.java
+++ b/Ghidra/Features/GhidraServer/src/main/java/ghidra/server/security/TokenGenerator.java
@@ -16,8 +16,7 @@
 package ghidra.server.security;
 
 import java.security.SecureRandom;
-import java.util.Date;
-import java.util.Map;
+import java.util.*;
 import java.util.concurrent.*;
 
 import generic.random.SecureRandomFactory;
@@ -84,13 +83,45 @@ public class TokenGenerator {
 		return ++offset;
 	}
 
+	/**
+	 * {@link Token} provides a byte array token wrapper to facilitate value-based
+	 * hashcode and equality when used as a map key.
+	 */
+	private static class Token {
+		private byte[] token;
+
+		Token(byte[] token) {
+			this.token = token;
+		}
+
+		@Override
+		public int hashCode() {
+			final int prime = 31;
+			int result = 1;
+			result = prime * result + Arrays.hashCode(token);
+			return result;
+		}
+
+		@Override
+		public boolean equals(Object obj) {
+			if (this == obj)
+				return true;
+			if (obj == null)
+				return false;
+			if (getClass() != obj.getClass())
+				return false;
+			Token other = (Token) obj;
+			return Arrays.equals(token, other.token);
+		}
+	}
+
 	/**
 	 * {@link CachedTokenSet} tracks timed token issuance and insures that they remain
 	 * valid for one-time consumption within limited life-span.
 	 */
 	private static class CachedTokenSet {
 
-		private final Map<byte[], Long> cache = new ConcurrentHashMap<>();
+		private final Map<Token, Long> cache = new ConcurrentHashMap<>();
 		private final ScheduledExecutorService scheduler =
 			Executors.newSingleThreadScheduledExecutor();
 
@@ -100,11 +131,11 @@ public class TokenGenerator {
 		}
 
 		void add(byte[] token) {
-			cache.put(token, System.currentTimeMillis());
+			cache.put(new Token(token), System.currentTimeMillis());
 		}
 
-		boolean consume(byte[] value) {
-			Long storedAt = cache.remove(value); // remove on retrieval
+		boolean consume(byte[] token) {
+			Long storedAt = cache.remove(new Token(token)); // remove on retrieval
 			if (storedAt == null)
 				return false;
 			return (System.currentTimeMillis() - storedAt < MAX_TTL_MS);
@@ -115,5 +146,4 @@ public class TokenGenerator {
 			cache.entrySet().removeIf(e -> now - e.getValue() >= MAX_TTL_MS);
 		}
 	}
-
 }
diff --git a/Ghidra/Test/IntegrationTest/src/test.slow/java/ghidra/server/RepositoryTest.java b/Ghidra/Test/IntegrationTest/src/test.slow/java/ghidra/server/RepositoryTest.java
index aeadceb3f3..4ada4a187a 100644
--- a/Ghidra/Test/IntegrationTest/src/test.slow/java/ghidra/server/RepositoryTest.java
+++ b/Ghidra/Test/IntegrationTest/src/test.slow/java/ghidra/server/RepositoryTest.java
@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -18,6 +18,7 @@ package ghidra.server;
 import static org.junit.Assert.*;
 
 import java.io.File;
+import java.io.IOException;
 
 import org.junit.*;
 
@@ -50,7 +51,13 @@ public class RepositoryTest extends AbstractGhidraHeadedIntegrationTest {
 		serverRoot.mkdir();
 
 		mgr = new RepositoryManager(serverRoot, false, 0, false);
-		mgr.getUserManager().addUser(userName);
+		UserManager userManager = mgr.getUserManager();
+		userManager.addUser(userName);
+
+		userManager.addUser("user-a");
+		userManager.addUser("user-b");
+		userManager.addUser("user-c");
+		userManager.addUser("user-d");
 
 		repository = mgr.createRepository(userName, REPOSITORY_NAME);
 	}
@@ -94,17 +101,10 @@ public class RepositoryTest extends AbstractGhidraHeadedIntegrationTest {
 			Assert.fail("Should not have been able to change current user's access!");
 		}
 		catch (UserAccessException e) {
+			// expected
 		}
 
-		users[3] = new User("user-x", User.ADMIN);
-		try {
-			repository.setUserList(userName, users, false);
-			Assert.fail("Should not have been able to set the user list!");
-		}
-		catch (UserAccessException e) {
-		}
-
-		users[4] = new User(userName, User.ADMIN);
+		users[4] = new User(userName, User.ADMIN); // restore current users Admin access
 		repository.setUserList(userName, users, false);
 
 		User[] reportedUsers = repository.getUserList(userName);
@@ -113,6 +113,15 @@ public class RepositoryTest extends AbstractGhidraHeadedIntegrationTest {
 			assertEquals(users[i].getName(), reportedUsers[i].getName());
 			assertEquals(users[i].getPermissionType(), reportedUsers[i].getPermissionType());
 		}
+
+		users[3] = new User("user-x", User.ADMIN);
+		try {
+			repository.setUserList(userName, users, false);
+			Assert.fail("Should not have been able to specify unknown user");
+		}
+		catch (IOException e) {
+			// expected
+		}
 	}
 
 	@Test