public boolean removeUser(String username) throws IOException {
		synchronized (repositoryMgr) {
			UserEntry oldEntry = userList.remove(username);
			if (oldEntry != null) {
				if (oldEntry.x500User != null) {
					dnLookupMap.remove(oldEntry.x500User);
				}
				writeUserList();
				repositoryMgr.userRemoved(username);
				log.info("User removed from server: " + username);
				return true;
			}
			return false;
		}
	}
Remove the specified user from the server access list
@param username user name/SID
@return true if existing user removed, else false if not found
@throws IOException if error occurs while updating user file
Ghidra/Features/GhidraServer/src/main/java/ghidra/server/UserManager.java