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I have followed the Azure Application Proxy connector and requested by Network Team to setup the firewall with the ports and domain documented here under Proxy Outbound Rules
We also double confirmed the firewall do not do any inline inspection on outbound TLS communications.
We installed the latest version of the connector 1.5.3437.0.
We are getting random Gateway Timeouts for different resources. Upon checking the firewall logs, seems like the Application Proxy Connector is trying to connect to ports 9350, 9352 and packets are being dropped. We only allowed port 80 and 443 as per docymentation.
I did some research, seems that these are ports that were used in previous Azure AD Connect versions.
Not sure if this is the reason why the Azure AD Connect is unstable.
Hello @Keen Hon WONG (SG) , I will reach the Application Proxy Connector team about this and will come back ASAP.
Hello @Keen Hon WONG (SG) , plese provide both firewall and client logs to azcommunity@microsoft.com with Subject Attn: Alfredo Revilla. Client logs: reproduce the issue while Collecting a network trace in the browser and send us the exported HAR. Alternatively you can use Fiddler.
Hi @Alfredo Revilla - Upwork Top Talent | IAM SWE SWA ,
The issue has resolve itself. We no longer see and Bad Gateway in our App Proxy Connectors. Probably someone has fixed them.
Thanks.
Hi @Alfredo Revilla - Upwork Top Talent | IAM SWE SWA ,
The Bad Gateway logs hasn't resurfaced for the last 5 days. The issue seems to have been resolved by someone else.
Thanks again.
Hello @Keen Hon WONG (SG) and thanks for sharing your solution. Since accepting your own answer is not supported I'm reposting your solution here so that you can accept and rate it. It will ensure that others facing a similar issue can easily find a solution.
The Bad Gateway logs hasn't resurfaced for the last 5 days. The issue seems to have been resolved by someone else. Thanks again.