Randon Daily Disconnects from Ultimate Terminal Emulation Software Across VPN

lately our terminal emulation vendor has been pointing to our network stating that the network is causing these disconnects either due to packet loss or network disconnections.
we have been reviewing our logs from each site  and show no disconnections from any of the sites
network consists of Cisco firewall at Server side with Fortinet  vpn connections to each location
location can only see server side, like hub and spoke; no external location can see each other only server side firewall can reach location and vice versa
this has only been happing the last few months with server side vendor claiming its the network due to packet loss as this is what they are used to
we do not see packet loss above 1%
how can we determine the culprit?
tired of chasing ghosts on the network
David ElebuteSystems ConsultantAsked:
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John TsioumprisSoftware & Systems EngineerCommented:
I had a similar case with Fortinet...i changed the modem...problem resolved....what and why i don't know....some maybe you will get lucky just by changing your Internet point of connection....
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David ElebuteSystems ConsultantAuthor Commented:
you just changed out the firewall and that resolved the problem?
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John TsioumprisSoftware & Systems EngineerCommented:
I changed the adsl modem...i don't know how you connect to the Internet...in my case we had ADSL
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David ElebuteSystems ConsultantAuthor Commented:
no this is 50B connected to ISP router
6MB Multiple T1's
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masnrockCommented:
Have you been able to figure out the saturation of the connection at the time the drops occur?
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David ElebuteSystems ConsultantAuthor Commented:
when you say saturation, do you mean how much bandwidth is in use?
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masnrockCommented:
Yes.
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David ElebuteSystems ConsultantAuthor Commented:
bandwidth has not been high or at maximum
just got message from site and they went down and our PRTG server shows unusually low bandwidth for this time of day
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David ElebuteSystems ConsultantAuthor Commented:
reviewing our Cisco firewall config at the hub of the network; with over 10 FB50B units at each remote site
I am leaning more towards an issue on the server side: Unix box with SSH term emulation through the vpn tunnels
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