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PCAnywhere dropping connection irregularily with a remote client. Why?

Posted on 2008-10-15
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Last Modified: 2013-12-20
Hi,

PCAnywhere dropping connection irregularily with a remote client. Why?

When I connect from home (about 30 miles away - with few amount of hops) there is no problem.  A contractor in London however (some 200 miles away) has issues with dropping.  He says he has no issue with people near to us but I am skeptical.   I have set the bandwidth to low, which reduces quality but improves performance somewhat.  He says it is our ISP - but do you think there is a subtle but ultimatly more important issue here, such as his firewall?  My connection after all is fine.
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Question by:chriscounter07
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Expert Comment

by:Trilog-Studios
ID: 22721011
hi
yes it can be a firewall but it also could be your isp. check the isp if it resets the connection if its cach is full or if there might be a polocy thast they restart your connection. also see if your router isn't perhaps the problem(if you are using a router)


TS
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Author Comment

by:chriscounter07
ID: 22823835
Used a network analysis tool to simulate PCAnywhere from external source through network.  No obvious problems.  Still kicking the remote admin off.
Disabled firewall.  Still kicks the remote admin off.
Spoke to ISP who identified that we had a variable throughput - potentially the cause of the problem, if you think about it.  This was fixed according to ISP.  Remote admin still being kicked off.
Replaced network topology with new setup.  Setup now goes:

MODEM -> PATCH PANEL -> PATCH PANEL -> SWITCH -> HOST (x8)

Still kicks remote admin off.

Modem, Firewall and Router all the same box.  Can now replace this - I have an exact copy handy - But first what kind of problem should I be looking out for, bearing in mind there is no variable throughput on our network...everything seems, well, fine to me :)

I'm beginning to think this is due the amount of hops resulting in some dropped packets.  It's perfectly feasible.
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Author Comment

by:chriscounter07
ID: 22958593
Hello,
so to recap, and to try and get a solution, as a result of advice by TS everything has been checked off bar the router at the end point.  

The question where we left it was "...I have an exact copy of the router...what kind of problem should I be looking out for...?"

If the router is seen to be in good working order then maybe the reason PCAnywhere connections are being dropped irregularly is due to the number of hops from the source PC to our machine.
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Author Comment

by:chriscounter07
ID: 23084382
bump
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Author Comment

by:chriscounter07
ID: 23632042
Is there anything else?
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Accepted Solution

by:
chriscounter07 earned 0 total points
ID: 23983583
There appears to be an issue in how PCAnywhere runs it's session.  Of course, much of it's information is run on UDP but a decent percentage is also TCP - I guess used for controls (for administering commands) and a logging system which of course has to be exact.  It just has so much functionality that it hinders it.  Running in a lower screen resolution helps but it just seems to sercome to lag and packet loss.  Many programs can run with a high packet loss.  This one, it seems, cannot.  This is essentially the answer.  I now use Webex which runs on port 80 i.e. over http, which i'm very happy with.

The version with the issue was 12.1.  As far as I'm aware others haven't experienced any problems in the latest version or versions preceeding this.

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