Can't access from a laptop sometimes

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I am using Tight VNC on 3 PCs A, B and C, all of them Windows 10 OS, connec=
ted to a router and create a network.

Using PC A and PC C as a master and PC B as a client.

Windows firewall is turned off for PC B.




PC A and PC B connected to router D.

But router D doesn't have enough plugs and wireless access, I connect route=
r router E to router D and connect PC C to router D.







Access from PC A to PC B is always smooth without problem, but sometimes fr=
om PC C to PC B, it has problem.




However I can ping from PC C to PC B and have reply from PC C, but when try=
 to acess to PC B using Tight VNC, it isn't able to access.

Also in that case, I have no problem checking the shared folder of PC B fro=
m PC C.




Then without rebooting any PCs, try all three of them, ping, Tight VNC and =
shared folder from PC A to PC B, all of them are possible.




What is causing this problem between PC B and C and how can I solve it.

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</style><p><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=
=82=AF', sans-serif;font-size: 16px">I am using Tight VNC on 3 PCs A, B and=
 C, all of them Windows 10 OS, connected to a router and create a network.<=
/span></p><p><span style=3D"font-size: 16px">Using PC A and PC C as a maste=
r and PC B as a client.</span></p><p><span style=3D"font-family: 'MS P=E3=
=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">Windows fir=
ewall is turned off for </span><span style=3D"font-size: 16px">PC </span><s=
pan style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-=
serif;font-size: 16px">B.</span></p><p><br></p><p><span style=3D"font-size:=
 16px">PC </span><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=
=83=E3=82=AF', sans-serif;font-size: 16px">A and </span><span style=3D"font=
-size: 16px">PC </span><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=
=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">B connected to router D.</=
span></p><p><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=
=82=AF', sans-serif;font-size: 16px">But router D doesn&#x27;t have enough =
plugs and wireless access, I connect router </span><span style=3D"font-size=
: 16px">router </span><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=
=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">E to </span><span style=3D=
"font-size: 16px">router </span><span style=3D"font-family: 'MS P=E3=82=B4=
=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">D and connect </s=
pan><span style=3D"font-size: 16px">PC </span><span style=3D"font-family: '=
MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">C to=
 router D.</span></p><p><br></p><p><br></p><p><span style=3D"font-family: '=
MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">Acce=
ss from </span><span style=3D"font-size: 16px">PC </span><span style=3D"fon=
t-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size:=
 16px">A to </span><span style=3D"font-size: 16px">PC </span><span style=3D=
"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-s=
ize: 16px">B is always smooth without problem, but sometimes from </span><s=
pan style=3D"font-size: 16px">PC </span><span style=3D"font-family: 'MS P=
=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">C to </s=
pan><span style=3D"font-size: 16px">PC </span><span style=3D"font-family: '=
MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">B, i=
t has problem.</span></p><p><br></p><p><span style=3D"font-family: 'MS P=E3=
=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">However I c=
an ping from </span><span style=3D"font-size: 16px">PC </span><span style=
=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;fon=
t-size: 16px">C to </span><span style=3D"font-size: 16px">PC </span><span s=
tyle=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif=
;font-size: 16px">B and have reply from </span><span style=3D"font-size: 16=
px">PC </span><span style=3D"font-family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=
=E3=82=AF', sans-serif;font-size: 16px">C, but when try to acess to </span>=
<span style=3D"font-size: 16px">PC </span><span style=3D"font-family: 'MS P=
=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">B using =
Tight VNC, it isn&#x27;t able to access.</span></p><p><span style=3D"font-f=
amily: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16=
px">Also in that case, I have no problem checking the shared folder of </sp=
an><span style=3D"font-size: 16px">PC </span><span style=3D"font-family: 'M=
S P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">B fro=
m </span><span style=3D"font-size: 16px">PC </span><span style=3D"font-fami=
ly: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px"=
>C.</span></p><p><br></p><p><span style=3D"font-family: 'MS P=E3=82=B4=E3=
=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">Then without rebooti=
ng any PCs, try all three of them, ping, Tight VNC and shared folder from <=
/span><span style=3D"font-size: 16px">PC </span><span style=3D"font-family:=
 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16px">A =
to </span><span style=3D"font-size: 16px">PC B</span><span style=3D"font-fa=
mily: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 16p=
x">, all of them are possible.</span></p><p><br></p><p><span style=3D"font-=
family: 'MS P=E3=82=B4=E3=82=B7=E3=83=83=E3=82=AF', sans-serif;font-size: 1=
6px">What is causing this problem between </span><span style=3D"font-size: =
16px">PC B and C and how can I solve it.</span></p>
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