I'm having issues with my Synology NAS where one Windows 11 PC on my network can't access the web GUI. Whenever I try to open the page, it ends up timing out after about 60 seconds. Oddly enough, all other PCs on the same network can access the NAS without any problem.
Here's what I've tried so far to fix this:
1. Disabled the Windows Firewall
2. Checked ping response is fine
3. Tried using Firefox with no change
4. Imported the certificate manually
5. Used a private browsing window
6. Analyzed traffic with Wireshark; it shows TLS HELLO messages being sent out, but there are no replies.
I'm certain this PC was able to access the NAS before, and it also used to connect to an iSCSI LUN on the NAS, which is now missing. The iSCSI connector can see the initiator and shows it's connected, but no drives appear in disk management. I'm not sure if these issues are related.
What else can I do to resolve this?
3 Answers
You might want to check if there's a safe access list on your Synology. It could be that access is restricted to certain IPs, which might be why that specific PC is having trouble.
It sounds like the MTU settings on your NAS might be the issue. I had a similar problem before, and when I checked, the MTU was set manually to 9000. Adjusting it fixed my access issues. Good luck!
This definitely sounds like a DNS issue. Try flushing the DNS cache and see if that makes a difference. Sometimes it can resolve these kinds of access problems.
I noticed that the screenshot shows it's reaching a 192.168.x.x address instead of using a fully qualified domain name, so that could be part of the problem.
Yeah, having the MTU set correctly is crucial for iSCSI connections, especially with jumbo frames. Just make sure your switches and devices are configured to handle it properly.