That's an interesting one. Port 445 is the Microsoft DS (Denial of Service) port, which happens to be vulnerable to the Lioten, Randon, WORM_DELODER.A, W32/Deloder.A, and W32.HLLW.Deloder viruses/worms. Now I'm not an expert on port 445, specifically - other processes that use Server Message Block (SMB) may use it as well.

What type of network are you running? OS and version, please. How many nodes on your network? Does the computer that is storing files on the C: drive run a different version of Windows than the PDC/BDC? How are your permissions set up for the folder that contains the stored files on the C: drive? Are you using individual user permissions or group permissions?

--
Dave Simpson
RND Solutions - Creative Graphic Design

(619) 322-3385 (Local San Diego)
(888) 690-0938 (Nationwide)
http://www.rnd-solutions.com

wrote in message

Problem:
-Users are experiencing a long delay, ranging from 5 seconds to 30+

seconds when opening an image using Adobe Photoshop 7.0 from the local hard drive.

Initial Analysis:
-The long delay is only experienced when the image file resides on the

local hard drive (C:\).

-If the image file resides on any other storage device (network drive,

cd-rom, usb drive, floppy), it opens normally, almost instantly.

-Opening the image file while having local admin permissions, opens the

file normally, even if it resides on the local hard drive.

-Unplugging the network cable, opens the file normally, even if it resides

on the local hard drive.

Troubleshooting/Observations:
-There seems to be heavy network activity during the time Photoshop is

opening the image file. Photoshop will not completely open the file until the network activity is finished. Several observations show that from the time the image file is double clicked from Windows Explorer, Photoshop opens, heavy network activity begins, approximately 5000+ packets are received/sent through the NIC, network activity stops, Photoshop opens the image successfully. This process can take anywhere between 5 to 30+ seconds.

-A local user account (non-admin) does not see latency when opening files

(not bound to a domain controller)

-A domain user account without local admin rights experiences the latency. -Size of the image file is not relevant to how long the latency will last.

File sizes that were used include, 38MB .tif | 24KB .jpg | 2.4MB .bmp

-Unplugging the network cable resolves the latency because no network

activity can occur.

-Unknown why having local admin rights eliminates the network activity,

thus eliminating the latency in opening image files in Photoshop 7.0.

-Disabling NetBIOS over TCP/IP also resolves the issue, but mapped drives

and network printers need to have this service enabled. Not a solution.

-After viewing a network port analyzer results, the network traffic is

going directly to the domain controller via port 445.

Question for Adobe:
-Why does PS7.0 need to contact the domain controller only when the image

file is opened from the local hard drive. Opening image files from a network drive does not cause this network activity. What is it authenticating before it opens the image file? It does this every time an image is opened from the C:\ drive.

Seems like this problem only hinders domain users. Oh and I have cleared

the pref settings, which didn't help at all.

Regards,
Kevin

Kevin_Rawls

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PS7 - Network Activity Port 445 Opening Image File