Windows 7 Machine stopped accepting RDC connections

tankman1989

tankman1989

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I have a Windows 7 Ultimate 64 bit desktop which has remote assistance and Remote Desktop (second choice - less secure) option selected. I have been able to RDC from other machines since I installed this OS back in March. Now all of the sudden it is not allowing me to do so. Before I would just enter the computer name and it would be found. I then would enter the appropriate username and password and I was in!

The only thing that I have done is to disconnect all cables and blow the dust out of the machine.

My computer has 2 built in NIC's X.X.2.114 and x.x.2.121. I can ping the 114 but not the 121 for some reason. When I ping the .121 I get:
pinging main.domain.invalid (192.168.2.121) with 32 bytes of data:
Request times out

The strange thing is that I can map network drives from the desktop to my notebook and they stayed mapped and working. But RDC does not work at all.

Can anyone give me any idea of why this might be? I would really appreciate it!

TM
 
tankman1989 said:
I have a Windows 7 Ultimate 64 bit desktop which has remote assistance and Remote Desktop (second choice - less secure) option selected. I have been able to RDC from other machines since I installed this OS back in March. Now all of the sudden it is not allowing me to do so. Before I would just enter the computer name and it would be found. I then would enter the appropriate username and password and I was in!

The only thing that I have done is to disconnect all cables and blow the dust out of the machine.

My computer has 2 built in NIC's X.X.2.114 and x.x.2.121. I can ping the 114 but not the 121 for some reason. When I ping the .121 I get:
pinging main.domain.invalid (192.168.2.121) with 32 bytes of data:
Request times out

The strange thing is that I can map network drives from the desktop to my notebook and they stayed mapped and working. But RDC does not work at all.

Can anyone give me any idea of why this might be? I would really appreciate it!

TM
Click to expand...

Just looking at the ip addresses of the 2 nics. Are the first two octets the same and what is the subnet mask?
 
Firstly please post your IP configuration in its entirety please - IP's, subnets, gateways and DNS.
Are you doing internal DNS resolution?
Can you ping your PC from another machine using it's name, or just it's IP?
What happens when you try to RDP to the PC using the IP?
Have you installed AV like Symantec or similar?
 
Martyn said:
Just looking at the ip addresses of the 2 nics. Are the first two octets the same and what is the subnet mask?
Click to expand...

From the Main computer (Desktop with 2 NIC's plugged into gigabit switch)
IPCONFIG
main-ipconfig.jpg


PINGS
main-pings.jpg



Toshiba Laptop (with 230degree AC powerconverter brick!!)
Toshiba notebook IPCONFIG
Toshiba-notebook-ipconfig.jpg


PINGS The strangest thing I found on this screen shot is when I accidentally typed 182.168.2.121
and it found something that would reply! Yet when I typed in the real # 192.168.2.121 (which is my
desktop/main) it didn't find anything.

Toshiba-notebook-pings.jpg


This is so frustrating! I have no idea where I went wrong or what I did. I can even map from the Toshiba notebook to the Main desktop with no problems.

Thanks again for any help, I greatly appreciate it!
 
Ok, firstly I see the 182.168.2.121 address is a public address. You get a reply because it's responding to ICMP. Do a tracert and you'll see it heads to Japan, so forget this.

I'm not seeing a DNS server in any of your configs. Can you please check this as to where DNS is coming from?

Also, why do you have 2 NICs connected? Are they bridged or teamed? If not this can lead to some serious problems such as broadcast storms and duplicate name errors.

If you are able to map a drive (browse to shares) between PC's but not ping or RDP you have firewall issues.
 
tankman1989 said:
PINGS The strangest thing I found on this screen shot is when I accidentally typed 182.168.2.121
and it found something that would reply!
Click to expand...
Based on the response time, I would venture a guess that there are computers in the cloud with those IP addresses, considering 182 isn't a private address.
 
ATTech said:
How can not being able to ping an I.P address of a computer on his network be a DNS issue?
Click to expand...

I agree, I suspect firewall at this stage if he is able to map drives/access network shares but not ping.

I'm intrigued as to why there are two NICs connected to the same LAN/switch...
 
Here is the ipconfig /all
Desktop named "Main"
main-ipconfig-all.jpg


Toshiba Notebook ipconfig /all
Toshiba-notebook-ipconfig-all.jpg


I have both NIC's from the desktop running to a gigabit switch. I looked at one of the cables and it was running at 100mbps. I swapped it out with another cable and it is now 1Gbps. I originally had both NIC's one running to a dedicated Linux file server and another to a switch. Should I disconnect one of these cables? What is the point of having two NIC's in the first place?

Thanks again for any and all help!

BTW, I still can't RDC into the machine using the computer name or any of the IP addresses.
 
Last edited:
You would use 2 NICs in a load balancing/failover type scenario, or if routing between two subnets.
For your purposes I would run a single NIC with a decent Cat5e or Cat6 patchlead.

The same for the laptop. Either switch off wireless or unplug the thing from the wall socket!

As for the domain.invalid this is provided by the router. This won't affect the operation, but looks ugly.

What is running on the PC in terms of security and antivirus?
Can you browse to the PC using windows explorer and see file shares?

I would also switch off the router, give it 30 seconds or so, then power it back up. Same for your switch. Is the switch a managed switch?
Lastly, are you able to ping:
192.168.2.1?
google.com? (and if not, can you ping 203.97.30.147)
 
Last edited:
SnoSalmon said:
You would use 2 NICs in a load balancing/failover type scenario, or if routing between two subnets.
For your purposes I would run a single NIC with a decent Cat5e or Cat6 patchlead.

The same for the laptop. Either switch off wireless or unplug the thing from the wall socket!

As for the domain.invalid this is provided by the router. This won't affect the operation, but looks ugly.

What is running on the PC in terms of security and antivirus?
Can you browse to the PC using windows explorer and see file shares?

I would also switch off the router, give it 30 seconds or so, then power it back up. Same for your switch. Is the switch a managed switch?
Lastly, are you able to ping:
192.168.2.1?
google.com? (and if not, can you ping 203.97.30.147)
Click to expand...

I had the wireless switched off and it did nothing. I was connecting RDC via wireless with no problems but speed.

The Cat5's are good quality and test fine

I am running Bitdefender 2010 Internet Security on the Main (3 yr license) and the same but 2011 trial on the notebook.
I'm also running MS security essentials on the desktop

I can ping both ask.com and 192.168.2.1 on both machines.

For some reason, My laptop can reach mapped drives on the main desktop but I can't reach shares on the laptop. I just created a share on the laptop and I just can't get it to connect.

VERY frustrating!
 
SnoSalmon said:
Uninstall Bitdefender from both and reboot.
I'm betting things will work sweet as.
(or you could examine the firewall rules in depth)
Click to expand...

Man, that is not fun. I don't know why it would work and then not, but I guess it could have added new rules or something. I'll check the rules first. Thanks!
 
I'm with Snosalmon on this, uncomplicate matters. I only ever saw one computer with two network cards on the same subnet and that was causing problems. Take the cable out and disable the 2nd nic.

Is this your home setup or a client?
 
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