Update faq.md

Updating the FAQ

src/faq.md

@@ -1,4 +1,5 @@
 # Frequently asked questions (FAQ)
+(Thanks to everyone who spent the time to post their fixes to common problems on the Brightspace Q&A)
 
 ### How do I use the H3 library?
 
@@ -18,3 +19,16 @@ And then add to library dependencies in your build.sbt:
 If you have trouble connecting via SSH to your cluster, the issue might be that you are using the private subnet.
 
 During cluster creation, in step 2 under Networking, select one of the public EC2 subnets.
+
+Another issue might be the standard firewall rules for the EC2 clusters. If you are having this problem, you can try the following steps:
+
+  1. Go to your cluster overview page and scroll down to "Network and Security"
+  2. Click the link below the "Primary Node - EMR managed security group"
+  3. Click "Actions" > "Edit inbound rules" (top right)
+  4. Find the rule for SSH (port 22) and click the X on the IP address that is currently there.
+  5. Click in the search box and select "0.0.0.0/0". (or enter a more restrictive IP range if you want)
+  6. Click "Save rules"
+
+### Do I need to keep the github repo of lab 1 up to date with the changes I made for lab 2?
+
+No, this is not necessary. If you have specific changes that you discuss in lab 1, make sure to specify that the code for that is in the lab 2 repository.