Can't connect to some VMs, deployed in the same virtual network

Hi, I'm new in azure, I'm trying to deploy SharePoint server in Azure according this article (msdn.microsoft.com/en-us/library/azure/dn275966.aspx).

I got a network problem. I can't connect and ping a half of my VMs.

VMs without problems: 
dc1 (primary domain controller) - Windows Server 2012 R2 Datacenter, ip=10.0.1.4,
dc2 (backup domain controller) - Windows Server 2012 R2 Datacenter, ip=10.0.1.5, 
sql1 (primary sql server) - SQL Server 2014 RTM Standard Windows Server 2012 R2, ip=10.0.1.6,
sql2 (backup sql server) - SQL Server 2014 RTM Standard Windows Server 2012 R2, ip=10.0.1.7,
spapp1 (first sharepoint app server) - SharePoint Server 2013 Trial Windows Server 2012, ip=10.0.1.8.

Each VM from this list can ping each other and can't ping other VMs, even by ip-address. For example dc1 can ping dc2, sql1, sql2, spapp1, and dc1 can't ping spapp2, spweb1, spweb2, webapp1, webapp2.

VMs with problems: 
spapp2 (second sharepoint app server) - SharePoint Server 2013 Trial Windows Server 2012, ip=10.0.1.9.
spweb1 (first sharepoint web server) - SharePoint Server 2013 Trial Windows Server 2012, ip=10.0.1.10.
spweb2 (second sharepoint web server) - SharePoint Server 2013 Trial Windows Server 2012, ip=10.0.1.11.
webapp1 (first office webapp server) - Windows Server 2012 R2 Datacenter, ip=10.0.1.12.
webapp2 (second office webapp server) - Windows Server 2012 R2 Datacenter, ip=10.0.1.13.

Each VM can ping some VM from noproblem group. No one VM from noproblem group can ping some VM from problem group. 

All VMs are domain computers.

All VMs are computers of same virtual network.

Virtual network configuration:
10.0.0.0/8 10.0.0.4 - 10.255.255.254
Subnet10.0.1.0/2410.0.1.4 - 10.0.1.254
DNS-servers:
10.0.1.4 dc1 (primary domain controller)
10.0.1.5 dc2 (backup domain controller)

I try to use network without own dns servers, but I got more problems after deleting dns servers.

What I did wrong?