Hi.
We are support company. We have the monitoring site and the office (tech support). And we are connecting with help of IPSec tunnels to clients offices to monitor equipment.
Suddenly we were faced the following trouble:
1. Client claims that IPSec tunnel beetwin client's offcices don't work.
2. We shutdown monitoring tunnel and from this point all ok.

We faced that some time we can't up additionsl IPSec tunnel bitween TECH SUPORT office and client's office if monitoring IPSec tunnel is working. Just don't work...

Monitoring site: MikroTik RouterBoard 1200 (5.22)
Office site: 2011UAS-2HnD (6.1)
Client office: 2011UAS-2HnD (6.1)

6.1 was reported to have IPSec issues. See the 6.1 release thread here on the forums for more info.

Use 6.0.

Sorry. Cant's find oficial MikroTik's release 6.0.

6.2 has the same issues...
We have 2 IPSec tummels. Suddenly both tunnels ceased to work. We disabled on of them. After that the other works perfect.


So... Do I need downgrade to 6.0?

6.2 has the same issues...
We have 2 IPSec tummels. Suddenly both tunnels ceased to work. We disabled on of them. After that the other works perfect.


So... Do I need downgrade to 6.0?

Which build did you try? Ipsec is fixed in the build that was made ~1hour ago

I used reccomended 6.2 (new). Now all is working perfect.